First of all, I am aware it is not good practice to do anything other then declare your functions etc... in the header file, but my teacher wanted us to follow this format so I am.
The goal of this particular function is to store user input into the various arrays in 'int main'.
The issue im getting with this function, as well as some others is that the compiler is throwing various errors I think are related to it not being able to recognize the arrays from 'int main'. (Just my guess).
Disclaimer: I have been working on this program since 4 pm till the time of posting this at 2 am so if im doing something really stupid I apologize, im honestly just going through the motions at this point.
//header file
void getVisitorInfo(int* age[], double* hours[], string* country[]) {
cout<<"Enter your country: ";
getline(cin, country[vCount]);
cout<<endl;
cout<<"Enter your age: ";
cin>>age[vCount];
cout<<endl;
cout<<"Enter the number of hours you explored: ";
cin>>hours[vCount];
cout<<endl;
vCount++;
}
//main file
const int max = 100;
int main() {
int age[max], vOldest, vYoungest, vAverage, userChoice;
double hours[max], vShortest, vLongest, vAverage;
string country[max];
bool pass;
//etc...
}
//a few of many errors
test.cpp: In function ‘void getVisitorInfo(int**, double**, std::string**)’:
test.cpp:84:31: error: no matching function for call to ‘getline(std::istream&, std::string*&)’
getline(cin, country[vCount]);
^
test.cpp:84:31: note: candidates are:
In file included from /usr/include/c++/4.8.2/string:53:0,
from /usr/include/c++/4.8.2/bits/locale_classes.h:40,
from /usr/include/c++/4.8.2/bits/ios_base.h:41,
from /usr/include/c++/4.8.2/ios:42,
from /usr/include/c++/4.8.2/ostream:38,
from /usr/include/c++/4.8.2/iostream:39,
from test.cpp:1:
/usr/include/c++/4.8.2/bits/basic_string.tcc:1068:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Traits, _Alloc>&, _CharT)
getline(basic_istream<_CharT, _Traits>& __in,
^
/usr/include/c++/4.8.2/bits/basic_string.tcc:1068:5: note: template argument deduction/substitution failed:
test.cpp:84:31: note: mismatched types ‘std::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::string* {aka std::basic_string<char>*}’
getline(cin, country[vCount]);
^
In file included from /usr/include/c++/4.8.2/string:52:0,
from /usr/include/c++/4.8.2/bits/locale_classes.h:40,
from /usr/include/c++/4.8.2/bits/ios_base.h:41,
from /usr/include/c++/4.8.2/ios:42,
from /usr/include/c++/4.8.2/ostream:38,
from /usr/include/c++/4.8.2/iostream:39,
from test.cpp:1:
/usr/include/c++/4.8.2/bits/basic_string.h:2793:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Traits, _Alloc>&)
getline(basic_istream<_CharT, _Traits>& __is,
^
/usr/include/c++/4.8.2/bits/basic_string.h:2793:5: note: template argument deduction/substitution failed:
test.cpp:84:31: note: mismatched types ‘std::basic_string<_CharT, _Traits, _Alloc>’ and ‘std::string* {aka std::basic_string<char>*}’
getline(cin, country[vCount]);
^
test.cpp:89:6: error: no match for ‘operator>>’ (operand types are ‘std::istream {aka std::basic_istream<char>}’ and ‘int*’)
cin>>age[vCount];
^
Related
I'm when trying to write to a stringstream using a overload of << for ostream gcc fails with:
error: no match for 'operator<<' (operand types are 'std::stringstream&() {aka std::__cxx11::basic_stringstream&()}' and 'const Test')
As far as I can tell the operator is defined, I've used similar code with stringstream (input operator for other classes where I overload for istream) with out any problems using the same compiler.
Example Code:
// Header
#include <istream>
#include <ostream>
class Test {
public:
Test* Clone() const { return onClone(); }
friend std::istream& operator >> (std::istream& lhs, Test& rhs) { rhs.onLoad(lhs); return lhs; }
friend std::ostream& operator << (std::ostream& lhs, const Test& rhs) { rhs.onSave(lhs); return lhs; }
private:
virtual void onLoad(std::istream& in) {}
virtual void onSave(std::ostream& out) const {}
Test* Test::onClone() const;
};
// Source
#include <sstream>
Test* Test::onClone() const
{
Test * tmp = new Test();
std::stringstream& buf();
buf << (*this); //!< ERROR HERE
buf >> (*tmp);
return tmp;
}
Filtered Build Output:
g++.exe -Wzero-as-null-pointer-constant -std=c++14 -m64 -Wcast-align -Wundef -Wfloat-equal -Winline -Wunreachable-code -Wswitch-enum -Wswitch-default -Weffc++ -Wzero-as-null-pointer-constant -pg -g -D_WIN32 -D_UNICODE -Iinclude -c test.cpp -o obj\Debug\test.o
test.cpp: In member function 'Test* Test::onClone() const':
test.cpp:23:9: error: no match for 'operator<<' (operand types are 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}' and 'const Test')
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:628:5: note: candidate: template<class _CharT, class _Traits, class _Tp> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&&, const _Tp&)
operator<<(basic_ostream<_CharT, _Traits>&& __os, const _Tp& __x)
^
%LibaryPath%/ostream:628:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:574:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const unsigned char*)
operator<<(basic_ostream<char, _Traits>& __out, const unsigned char* __s)
^
%LibaryPath%/ostream:574:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:569:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const signed char*)
operator<<(basic_ostream<char, _Traits>& __out, const signed char* __s)
^
%LibaryPath%/ostream:569:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:556:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, const char*)
operator<<(basic_ostream<char, _Traits>& __out, const char* __s)
^
%LibaryPath%/ostream:556:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/ostream:638:0,
from %LibaryPath%/istream:39,
from test.cpp:2:
%LibaryPath%/bits/ostream.tcc:321:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const char*)
operator<<(basic_ostream<_CharT, _Traits>& __out, const char* __s)
^
%LibaryPath%/bits/ostream.tcc:321:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:539:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const _CharT*)
operator<<(basic_ostream<_CharT, _Traits>& __out, const _CharT* __s)
^
%LibaryPath%/ostream:539:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:519:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, unsigned char)
operator<<(basic_ostream<char, _Traits>& __out, unsigned char __c)
^
%LibaryPath%/ostream:519:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:514:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, signed char)
operator<<(basic_ostream<char, _Traits>& __out, signed char __c)
^
%LibaryPath%/ostream:514:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:508:5: note: candidate: template<class _Traits> std::basic_ostream<char, _Traits>& std::operator<<(std::basic_ostream<char, _Traits>&, char)
operator<<(basic_ostream<char, _Traits>& __out, char __c)
^
%LibaryPath%/ostream:508:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:502:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, char)
operator<<(basic_ostream<_CharT, _Traits>& __out, char __c)
^
%LibaryPath%/ostream:502:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/istream:39:0,
from test.cpp:2:
%LibaryPath%/ostream:497:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, _CharT)
operator<<(basic_ostream<_CharT, _Traits>& __out, _CharT __c)
^
%LibaryPath%/ostream:497:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/bits/ios_base.h:46:0,
from %LibaryPath%/ios:42,
from %LibaryPath%/istream:38,
from test.cpp:2:
%LibaryPath%/system_error:209:5: note: candidate: template<class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::error_code&)
operator<<(basic_ostream<_CharT, _Traits>& __os, const error_code& __e)
^
%LibaryPath%/system_error:209:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
In file included from %LibaryPath%/string:52:0,
from %LibaryPath%/bits/locale_classes.h:40,
from %LibaryPath%/bits/ios_base.h:41,
from %LibaryPath%/ios:42,
from %LibaryPath%/istream:38,
from test.cpp:2:
%LibaryPath%/bits/basic_string.h:5167:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
operator<<(basic_ostream<_CharT, _Traits>& __os,
^
%LibaryPath%/bits/basic_string.h:5167:5: note: template argument deduction/substitution failed:
test.cpp:23:18: note: mismatched types 'std::basic_ostream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf << (*this); //!< ERROR HERE
^
test.cpp:9:26: note: candidate: std::ostream& operator<<(std::ostream&, const Test&)
friend std::ostream& operator << (std::ostream& lhs, const Test& rhs) { rhs.onSave(lhs); return lhs; }
^
test.cpp:9:26: note: no known conversion for argument 1 from 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}' to 'std::ostream& {aka std::basic_ostream<char>&}'
test.cpp:24:9: error: no match for 'operator>>' (operand types are 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}' and 'Test')
buf >> (*tmp);
^
In file included from test.cpp:2:0:
%LibaryPath%/istream:924:5: note: candidate: template<class _CharT, class _Traits, class _Tp> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&&, _Tp&)
operator>>(basic_istream<_CharT, _Traits>&& __is, _Tp& __x)
^
%LibaryPath%/istream:924:5: note: template argument deduction/substitution failed:
test.cpp:24:17: note: mismatched types 'std::basic_istream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf >> (*tmp);
^
In file included from test.cpp:2:0:
%LibaryPath%/istream:808:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char*)
operator>>(basic_istream<char, _Traits>& __in, signed char* __s)
^
%LibaryPath%/istream:808:5: note: template argument deduction/substitution failed:
test.cpp:24:17: note: mismatched types 'std::basic_istream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf >> (*tmp);
^
In file included from test.cpp:2:0:
%LibaryPath%/istream:803:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char*)
operator>>(basic_istream<char, _Traits>& __in, unsigned char* __s)
^
%LibaryPath%/istream:803:5: note: template argument deduction/substitution failed:
test.cpp:24:17: note: mismatched types 'std::basic_istream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf >> (*tmp);
^
In file included from test.cpp:2:0:
%LibaryPath%/istream:761:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, signed char&)
operator>>(basic_istream<char, _Traits>& __in, signed char& __c)
^
%LibaryPath%/istream:761:5: note: template argument deduction/substitution failed:
test.cpp:24:17: note: mismatched types 'std::basic_istream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf >> (*tmp);
^
In file included from test.cpp:2:0:
%LibaryPath%/istream:756:5: note: candidate: template<class _Traits> std::basic_istream<char, _Traits>& std::operator>>(std::basic_istream<char, _Traits>&, unsigned char&)
operator>>(basic_istream<char, _Traits>& __in, unsigned char& __c)
^
%LibaryPath%/istream:756:5: note: template argument deduction/substitution failed:
test.cpp:24:17: note: mismatched types 'std::basic_istream<char, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf >> (*tmp);
^
In file included from %LibaryPath%/istream:934:0,
from test.cpp:2:
%LibaryPath%/bits/istream.tcc:923:5: note: candidate: template<class _CharT, class _Traits> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT&)
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT& __c)
^
%LibaryPath%/bits/istream.tcc:923:5: note: template argument deduction/substitution failed:
test.cpp:24:17: note: mismatched types 'std::basic_istream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf >> (*tmp);
^
In file included from %LibaryPath%/istream:934:0,
from test.cpp:2:
%LibaryPath%/bits/istream.tcc:955:5: note: candidate: template<class _CharT2, class _Traits2> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, _CharT2*)
operator>>(basic_istream<_CharT, _Traits>& __in, _CharT* __s)
^
%LibaryPath%/bits/istream.tcc:955:5: note: template argument deduction/substitution failed:
test.cpp:24:17: note: mismatched types 'std::basic_istream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf >> (*tmp);
^
In file included from %LibaryPath%/string:53:0,
from %LibaryPath%/bits/locale_classes.h:40,
from %LibaryPath%/bits/ios_base.h:41,
from %LibaryPath%/ios:42,
from %LibaryPath%/istream:38,
from test.cpp:2:
%LibaryPath%/bits/basic_string.tcc:1441:5: note: candidate: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::operator>>(std::basic_istream<_CharT, _Traits>&, std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&)
operator>>(basic_istream<_CharT, _Traits>& __in,
^
%LibaryPath%/bits/basic_string.tcc:1441:5: note: template argument deduction/substitution failed:
test.cpp:24:17: note: mismatched types 'std::basic_istream<_CharT, _Traits>' and 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}'
buf >> (*tmp);
^
test.cpp:8:26: note: candidate: std::istream& operator>>(std::istream&, Test&)
friend std::istream& operator >> (std::istream& lhs, Test& rhs) { rhs.onLoad(lhs); return lhs; }
^
test.cpp:8:26: note: no known conversion for argument 1 from 'std::stringstream&() {aka std::__cxx11::basic_stringstream<char>&()}' to 'std::istream& {aka std::basic_istream<char>&}'
std::stringstream& buf();
buf << (*this); //!< ERROR HERE
Here buf is declared as a function returning a reference to a stringstream. If that was your intention, and you have defined that function elsewhere, you need to call the function to get the reference:
buf() << *this;
If you intended to have buf as a local stream, the declaration would be just
std::stringstream buf;
without the & and ().
The buf is a function declaration having no argument and return type as std::stringstream&. That's why no operator match error is shown by g++.
When creating a local object with default constructor, you should create it like,
std::stringstream buf;
It will remove no operator match errors.
Solved the problem already when checking a last time before posting this, but it looked somewhat evil to debug (at least for a newbie), so I'll post it anyway - feel free to delete.
The problem was that in the marked line below, ofstream seemed unable to write a simple string; the templating appeared to be the problem:
template <typename T>
void appendVectorToCSV(const std::string& header, std::vector<T> row,
const std::string& outfilename){
std::ofstream fout(outfilename);
fout << header;// << ","; /* The error line 80 */
...
This gives the error:
varUtils.hpp: In function ‘void appendVectorToCSV(std::string&, const std::vector<_RealType>&, const string&)’:
varUtils.hpp:80:10: error: no match for ‘operator<<’ (operand types are ‘std::ofstream {aka std::basic_ofstream<char>}’ and ‘std::string {aka std::basic_string<char>}’)
fout << header;// << ",";
^
varUtils.hpp:80:10: note: candidates are:
...
/usr/include/c++/4.8/complex:524:5: note: template<class _Tp, class _CharT, class _Traits> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::complex<_Tp>&)
operator<<(basic_ostream<_CharT, _Traits>& __os, const complex<_Tp>& __x)
^
/usr/include/c++/4.8/complex:524:5: note: template argument deduction/substitution failed:
...
varUtils.hpp:80:13: note: ‘std::ofstream {aka std::basic_ofstream<char>}’ is not derived from ‘std::basic_ostream<_CharT, _Traits>’
fout << header;// << ",";
^
So, solution:
A missing header.
#include <iostream>
was already there, but not
#include <fstream>
Sorry I'm new to C++, but I am having a problem compiling a C++ program that uses the functions of a class defined in another file.
I have:
// GradeBook.h
// GradeBook class definition in a separate file from main.
//
#include <iostream>
#include <string>
using namespace std;
class GradeBook
{
public:
GradeBook (string name)
{
setCourseName(name);
} // end GradeBook constructor
void setCourseName(string name)
{
courseName = name;
}
string getCourseName()
{ return CourseName; }
void displayMessage()
{ cout <<"Welcome to the gradebook for\n" <<getCourseName()<<"!"<endl; }
private:
string courseName;
}; //End of class
and this main file:
// grade.cpp
// Including class GradeBook from file GradeBook.h for use in main.
//
#include <iostream>
#include "Gradebook.h"
using namespace std;
int main()
{
GradeBook gradeBook1( "CS101 Introduction to C++ Programing");
GradeBook gradeBook2( "Cs102 Data Structures in C++");
cout <<"gradeBook1 create for course: "<<gradeBook1.getCourseName() <<"\ngradeBook2 created for course: "<<gradeBook2.getCourseName() <<endl;
}// end main
// grade.cpp
// Including class GradeBook from file GradeBook.h for use in main.
//
#include <iostream>
#include "Gradebook.h"
using namespace std;
int main()
{
GradeBook gradeBook1( "CS101 Introduction to C++ Programing");
GradeBook gradeBook2( "Cs102 Data Structures in C++");
cout <<"gradeBook1 create for course: "<<gradeBook1.getCourseName() <<"\ngradeBook2 created for course: "<<gradeBook2.getCourseName() <<endl;
}// end main
When I try to compile grade.cpp I get so many errors.
My operating system is Fedora, and I use g++ grade.cpp -o grade -Wall
to compile the program.
Can someone please help?
Error Message:
g++ grade.cpp -o grade -lm
In file included from grade.cpp:5:0:
Gradebook.h: In member function ‘std::string GradeBook::getCourseName()’:
Gradebook.h:23:11: error: ‘CourseName’ was not declared in this scope
{ return CourseName; }
^
Gradebook.h: In member function ‘void GradeBook::displayMessage()’:
Gradebook.h:26:66: error: no match for ‘operator<’ (operand types are ‘std::basic_ostream<char>’ and ‘<unresolved overloaded function type>’)
{ cout <<"Welcome to the gradebook for\n" <<getCourseName()<<"!"<endl; }
^
Gradebook.h:26:66: note: candidates are:
In file included from /usr/include/c++/4.8.3/bits/stl_algobase.h:64:0,
from /usr/include/c++/4.8.3/bits/char_traits.h:39,
from /usr/include/c++/4.8.3/ios:40,
from /usr/include/c++/4.8.3/ostream:38,
from /usr/include/c++/4.8.3/iostream:39,
from grade.cpp:4:
/usr/include/c++/4.8.3/bits/stl_pair.h:220:5: note: template<class _T1, class _T2> bool std::operator<(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)
operator<(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
^
/usr/include/c++/4.8.3/bits/stl_pair.h:220:5: note: template argument deduction/substitution failed:
In file included from grade.cpp:5:0:
Gradebook.h:26:67: note: ‘std::basic_ostream<char>’ is not derived from ‘const std::pair<_T1, _T2>’
{ cout <<"Welcome to the gradebook for\n" <<getCourseName()<<"!"<endl; }
^
In file included from /usr/include/c++/4.8.3/bits/stl_algobase.h:67:0,
from /usr/include/c++/4.8.3/bits/char_traits.h:39,
from /usr/include/c++/4.8.3/ios:40,
from /usr/include/c++/4.8.3/ostream:38,
from /usr/include/c++/4.8.3/iostream:39,
from grade.cpp:4:
/usr/include/c++/4.8.3/bits/stl_iterator.h:297:5: note: template<class _Iterator> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_Iterator>&)
operator<(const reverse_iterator<_Iterator>& __x,
^
/usr/include/c++/4.8.3/bits/stl_iterator.h:297:5: note: template argument deduction/substitution failed:
In file included from grade.cpp:5:0:
Gradebook.h:26:67: note: ‘std::basic_ostream<char>’ is not derived from ‘const std::reverse_iterator<_Iterator>’
{ cout <<"Welcome to the gradebook for\n" <<getCourseName()<<"!"<endl; }
^
In file included from /usr/include/c++/4.8.3/bits/stl_algobase.h:67:0,
from /usr/include/c++/4.8.3/bits/char_traits.h:39,
from /usr/include/c++/4.8.3/ios:40,
from /usr/include/c++/4.8.3/ostream:38,
from /usr/include/c++/4.8.3/iostream:39,
from grade.cpp:4:
/usr/include/c++/4.8.3/bits/stl_iterator.h:347:5: note: template<class _IteratorL, class _IteratorR> bool std::operator<(const std::reverse_iterator<_Iterator>&, const std::reverse_iterator<_IteratorR>&)
operator<(const reverse_iterator<_IteratorL>& __x,
^
/usr/include/c++/4.8.3/bits/stl_iterator.h:347:5: note: template argument deduction/substitution failed:
In file included from grade.cpp:5:0:
Gradebook.h:26:67: note: ‘std::basic_ostream<char>’ is not derived from ‘const std::reverse_iterator<_Iterator>’
{ cout <<"Welcome to the gradebook for\n" <<getCourseName()<<"!"<endl; }
^
In file included from /usr/include/c++/4.8.3/string:52:0,
from /usr/include/c++/4.8.3/bits/locale_classes.h:40,
from /usr/include/c++/4.8.3/bits/ios_base.h:41,
from /usr/include/c++/4.8.3/ios:42,
from /usr/include/c++/4.8.3/ostream:38,
from /usr/include/c++/4.8.3/iostream:39,
from grade.cpp:4:
/usr/include/c++/4.8.3/bits/basic_string.h:2569:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const std::basic_string<_CharT, _Traits, _Alloc>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^
/usr/include/c++/4.8.3/bits/basic_string.h:2569:5: note: template argument deduction/substitution failed:
In file included from grade.cpp:5:0:
Gradebook.h:26:67: note: ‘std::basic_ostream<char>’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’
{ cout <<"Welcome to the gradebook for\n" <<getCourseName()<<"!"<endl; }
^
In file included from /usr/include/c++/4.8.3/string:52:0,
from /usr/include/c++/4.8.3/bits/locale_classes.h:40,
from /usr/include/c++/4.8.3/bits/ios_base.h:41,
from /usr/include/c++/4.8.3/ios:42,
from /usr/include/c++/4.8.3/ostream:38,
from /usr/include/c++/4.8.3/iostream:39,
from grade.cpp:4:
/usr/include/c++/4.8.3/bits/basic_string.h:2581:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const std::basic_string<_CharT, _Traits, _Alloc>&, const _CharT*)
operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
^
/usr/include/c++/4.8.3/bits/basic_string.h:2581:5: note: template argument deduction/substitution failed:
In file included from grade.cpp:5:0:
Gradebook.h:26:67: note: ‘std::basic_ostream<char>’ is not derived from ‘const std::basic_string<_CharT, _Traits, _Alloc>’
{ cout <<"Welcome to the gradebook for\n" <<getCourseName()<<"!"<endl; }
^
In file included from /usr/include/c++/4.8.3/string:52:0,
from /usr/include/c++/4.8.3/bits/locale_classes.h:40,
from /usr/include/c++/4.8.3/bits/ios_base.h:41,
from /usr/include/c++/4.8.3/ios:42,
from /usr/include/c++/4.8.3/ostream:38,
from /usr/include/c++/4.8.3/iostream:39,
from grade.cpp:4:
/usr/include/c++/4.8.3/bits/basic_string.h:2593:5: note: template<class _CharT, class _Traits, class _Alloc> bool std::operator<(const _CharT*, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator<(const _CharT* __lhs,
^
/usr/include/c++/4.8.3/bits/basic_string.h:2593:5: note: template argument deduction/substitution failed:
In file included from grade.cpp:5:0:
Gradebook.h:26:67: note: mismatched types ‘const _CharT*’ and ‘std::basic_ostream<char>’
{ cout <<"Welcome to the gradebook for\n" <<getCourseName()<<"!"<endl; }
you have to link it against the file to do this both must be compiled. e.g. g++ -Wall -Wextra grade.cpp Gradebook.cpp -o grade see how to link header files in c++
I am trying to take a simple CSV file, split it line-by-line, and print it to the console. Currently I am getting an error when compiling and want to know if I am missing something obvious.
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
int main(int argc , char** argv) {
std::string line;
std::ifstream infile(argv[1]);
if (infile) {
while (getline(infile, line)) {
std::istringstream ss(line);
std::string token;
while(std::getline(ss, token, ",")) {
std::cout << token << "\n";
}
}
}
infile.close();
return 0;
}
The error I am getting is as follows.
csv.cpp: In function 'int main(int, char**)':
csv.cpp:41:46: error: no matching function for call to 'getline(std::istringstream&,
std::string&, const char [2])'
csv.cpp:41:46: note: candidates are:
In file included from /usr/include/c++/4.7/string:55:0,
from /usr/include/c++/4.7/bits/locale_classes.h:42,
from /usr/include/c++/4.7/bits/ios_base.h:43,
from /usr/include/c++/4.7/ios:43,
from /usr/include/c++/4.7/istream:40,
from /usr/include/c++/4.7/fstream:40,
from csv.cpp:21:
/usr/include/c++/4.7/bits/basic_string.tcc:1070:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Traits, _Alloc>&, _CharT)
/usr/include/c++/4.7/bits/basic_string.tcc:1070:5: note: template argument deduction/substitution failed:
csv.cpp:41:46: note: deduced conflicting types for parameter '_CharT' ('char' and 'const char*')
In file included from /usr/include/c++/4.7/string:54:0,
from /usr/include/c++/4.7/bits/locale_classes.h:42,
from /usr/include/c++/4.7/bits/ios_base.h:43,
from /usr/include/c++/4.7/ios:43,
from /usr/include/c++/4.7/istream:40,
from /usr/include/c++/4.7/fstream:40,
from csv.cpp:21:
/usr/include/c++/4.7/bits/basic_string.h:2792:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Traits, _Alloc>&)
/usr/include/c++/4.7/bits/basic_string.h:2792:5: note: template argument deduction/substitution failed:
csv.cpp:41:46: note: candidate expects 2 arguments, 3 provided
The third parameter of getline is a char, not a char*. Make it getline(ss, token, ',') - note single quotes.
Oh, and beware CSV fields "like"",""this" (in case you wonder, this is a single field with the value of like","this). There's more to CSV syntax than meets the eye.
Perhaps you should use a library for CSV munging... perhaps this question is useful.
I'm attempting to read from a file and use strtok() to break up the strings I get in from the file. The problem is, I keep getting this error whenever I compile the program.
source.cpp: In function ‘int main(int, char**)’:
source.cpp:39:32: error: no matching function for call to ‘getline(char [1000], int, char)’
source.cpp:39:32: note: candidates are:
/usr/include/stdio.h:675:20: note: __ssize_t getline(char**, size_t*, FILE*)
/usr/include/stdio.h:675:20: note: no known conversion for argument 1 from ‘char [1000]’ to ‘char**’
/usr/include/c++/4.6/bits/basic_string.h:2734:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Traits, _Alloc>&)
/usr/include/c++/4.6/bits/basic_string.tcc:1070:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_istream<_CharT, _Traits>& std::getline(std::basic_istream<_CharT, _Traits>&, std::basic_string<_CharT, _Traits, _Alloc>&, _CharT)
Here is the portion of my code that is causing the problem.
char *p, line[1000], opcode[9], arg1[256], arg2[256];
int i = 0;
while(getline(line, 1000, '\n') != NULL)
{
line[strlen(line)-1] = '\0';
cout << "Line = " << line << endl;
if (strchr(line, '#'))
{
*p = '\0';
}
if (p = strtok(line, "\t"))
strcpy(opcode,p);
if (p = strtok(NULL, "\t"))
strcpy(arg1,p);
if (p = strtok(NULL, "\t"))
strcpy(arg2,p);
printf("opcode=:%s: arg1=:%s: arg2=:%s:\n",opcode,arg1,arg2);
}
I'd appreciate any help I can get. Thank you.
You call the getline() function completely wrong. See the manual for getline() on how to use it. You get a hint:
candidates are:
__ssize_t getline(char**, size_t*, FILE*)
In your case it would be something like this:
getline(&line, 1000, your_file_pointer)
You need to open a stream to the file before you can start writing to it.
Here is a tutorial on how to do it.