This code at the indicated lines are both producing the
error: Get is not a member of 'std'
Additionally the code also does not accept .first and .second notation and throws the error that they aren't declared in this scope.
#include <string>
#include <iostream>
#include <fstream>
#include <iterator>
#include <map>
#include <utility>
#include <vector>
#include <queue>
using namespace std;
...
std::pair <int,int> pairs;
queue <int> quads;
map<int,std::pair<int,int> > pairSets;
...
int parseValue(int searchVal)
{
int tempVal;
for(int i = 0; i < count; i++)
{
for(int j = 1; j < count; j++)
{
tempVal = data[i]+data[j];
if(pairSets.find(searchVal-tempVal) != pairSets.end())
{
quads.push(data[i]);
quads.push(data[j]);
quads.push(std::get<0>(pairSets.find(searchVal-tempVal))); //These lines are producing errors
quads.push(std::get<1>(pairSets.find(searchVal-tempVal)));
}
}
}
}
Unfortunately i am not as familiar with c++ programming than i am a with C#, i am struggling to find the reason for this error through the C++ source code, i believe i am using maps and pairs incorrectly but i can't find any resources to indicate in what way i am misusing them.
I would appreciate any help or advice anyone has to offer, thank you.
Related
So I recently discovered the use of map and vectors, however, I'm having trouble of trying to figure a way to loop through a vector containing strings.
Here's what I've tried:
#include <string>
#include <vector>
#include <stdio>
using namespace std;
void main() {
vector<string> data={"Hello World!","Goodbye World!"};
for (vector<string>::iterator t=data.begin(); t!=data.end(); ++t) {
cout<<*t<<endl;
}
}
and when I try to compile it, I get this error:
cd C:\Users\Jason\Desktop\EXB\Win32
wmake -f C:\Users\Jason\Desktop\EXB\Win32\exbint.mk -h -e
wpp386 ..\Source\exbint.cpp -i="C:\WATCOM/h;C:\WATCOM/h/nt" -w4 -e25 -zq -od -d2 -6r -bt=nt -fo=.obj -mf -xs -xr
..\Source\exbint.cpp(59): Error! E157: col(21) left expression must be integral
..\Source\exbint.cpp(59): Note! N717: col(21) left operand type is 'std::ostream watcall (lvalue)'
..\Source\exbint.cpp(59): Note! N718: col(21) right operand type is 'std::basic_string<char,std::char_traits<char>,std::allocator<char>> (lvalue)'
Error(E42): Last command making (C:\Users\Jason\Desktop\EXB\Win32\exbint.obj) returned a bad status
Error(E02): Make execution terminated
Execution complete
I tried the same method using map and it worked. The only difference was I changed the cout line to:
cout<<t->first<<" => "<<t->last<<endl;
Add iostream header file and change stdio to cstdio.
#include <iostream>
#include <string>
#include <vector>
#include <cstdio>
using namespace std;
int main()
{
vector<string> data={"Hello World!","Goodbye World!"};
for (vector<string>::iterator t=data.begin(); t!=data.end(); ++t)
{
cout<<*t<<endl;
}
return 0;
}
#include <iostream>
#include <vector>
#include <string>
int main()
{
std::vector<std::string> data = {"Hello World!", "Goodbye World!"};
for (std::vector<std::string>::iterator t = data.begin(); t != data.end(); t++) {
std::cout << *t << std::endl;
}
return 0;
}
Or with C++11 (or higher):
#include <iostream>
#include <vector>
#include <string>
typedef std::vector<std::string> STRVEC;
int main()
{
STRVEC data = {"Hello World!", "Goodbye World!"};
for (auto &s: data) {
std::cout << s << std::endl;
}
return 0;
}
From the Open Watcom V2 Fork-Wiki on the C++ Library Status page:
<string>
Mostly complete. Although there are no I/O operators, all other member functions and string operations are available.
A workaround (besides implementing the << operator) would be asking the string instances for the C string:
for (vector<string>::iterator t = data.begin(); t != data.end(); ++t) {
cout << t->c_str() << endl;
}
This of course only works as long as the strings don't contain zero byte values.
When I compile your code, I get:
40234801.cpp:3:17: fatal error: stdio: No such file or directory
#include <stdio>
^
You clearly have a header called "stdio" in your include path that you haven't shown us.
If you change that line to the standard #include <iostream>, then the only reported error is that you wrote void main() instead of int main(). Fix that, and it will build and run.
In passing, note also that using namespace should be avoided.
I found a solution to my own issue. Instead of using a c_str, I used std::string and switched to using the G++ compiler instead of Open Watcom
Instead of having:
char *someString="Blah blah blah";
I instead replaced it with:
string someString="Blah blah blah";
This way is much more efficient and easier.
for some reason I get the "Process terminated with status -1073741819" error whenever I run my program, I've read that some people get this error because of something wrong with code-blocks/the compiler, i just wanted to know if there is anything wrong with my code before i go reinstalling compilers and such. I'm using code::blocks and the GNU GCC compiler.
my code creates a vector which stores 40 working hours in a week, and a vector inside that vector which stores letters representing the 5 people available in those hours.
Schedule.cpp:
#include <iostream>
#include "Schedule.h"
#include <vector>
#include <string>
using namespace std;
/// Creates a Vector which holds 40 items (each hour in the week)
/// each item has 5 values ( J A P M K or X, will intialize as J A P M K)
vector< vector<string> > week(40, vector<string> (5));
Schedule::Schedule(){
for (int i = 0; i<40; i++){
week[i][0] = 'J';
week[i][1] = 'A';
week[i][2] = 'P';
week[i][3] = 'M';
week[i][4] = 'K';
}
// test
cout << week[1][3] << endl;
}
header file:
#ifndef SCHEDULE_H
#define SCHEDULE_H
#include <vector>
#include <string>
using namespace std;
class Schedule
{
public:
Schedule();
protected:
private:
vector< vector<string> > week;
};
#endif // SCHEDULE_H
main.cpp:
#include <iostream>
#include "Schedule.h"
#include <vector>
#include <string>
using namespace std;
int main()
{
Schedule theWeek;
}
This is not a copiler bug.
You are getting a memory fault in your constructor.
There are several things wrong with your code, for example in your cpp you declare a global vector week which then is hiden in the constructor since the constructor will access Schedule::week .
Your cpp should be something like :
// comment out the global declaration of a vector week ...
// you want a vector for each object instantiation, not a shared vector between all Schedule objects
// vector< vector<string> > week(40, vector<string> (5));
Schedule::Schedule()
{
for (int i=0;i<40;i++)
{
vector<string> stringValues;
stringValues.push_back("J");
stringValues.push_back("A");
stringValues.push_back("P");
stringValues.push_back("M");
stringValues.push_back("K");
week.push_back(stringValues);
}
}
You get the memory fault in your code when you try to access your week vector for the first time :
week[i][0] = 'J' ;
At the moment you call that line of code, your Schedule::week vector has 0 elements inside it (so week[i] is already a fault).
This question already has answers here:
How do I force my std::map to deallocate memory used?
(7 answers)
Closed 8 years ago.
I have a program:
#include <iostream>
#include <map>
#include <string>
#include <algorithm>
#include <cstdlib>
#include <iomanip>
#include <vector>
#include <stdarg.h>
#include <stdio.h>
#include <unistd.h>
using namespace std;
int main() {
map<int, string> m;
for (int i = 0; i < 1000000; i++)
{
m[i] = "jahsdghsagdfv sahgvsahgd fvsahgdf fsdfjsadvhjgsd jhgfhsahfvsafh asfvasgfv jhgfdvsahgvfs";
}
m.clear();
while (1) {sleep(5);}
return 1;
}
clear() does nothing. In memory monitor I see memory usage 184 Mb and nothing change after clear. Why ? How to clear memory of map ?
Yes, map::clear does something: "Removes all elements from the map container (which are destroyed), leaving the container with a size of 0."
The data will not be removed also from stack/heap,but this shall not influence you since you'll have no pointer and no cast type to that obsolete data.
Probably when you will refill the map that memory area will be reused and updated with new values (if it was not used by other variables meanwhile).
Like this question already asked, I'd like to initialize a container using STL where the elements are hard-coded in the cleanest manner possible. In this case, the elements are a doubly nested container:
set<vector<int> > A;
And I'd like (for example) to put the following values in:
A = [[0,0,1],[0,1,0],[1,0,0],[0,0,0]];
C++0x fine, using g++ 4.4.1. STL is preferable as I don't use Boost for any other parts of the code (though I wouldn't mind an example with it!).
This does use g++ 4.4.1, with -std=c++0x
#include <set>
#include <vector>
using namespace std;
int main()
{
set<vector<int>> A = {{0,0,1},{0,1,0},{1,0,0},{0,0,0}};
}
#include <boost/assign/list_of.hpp>
#include <vector>
#include <set>
using namespace std;
using namespace boost::assign;
int main()
{
set<vector<int> > A;
A = list_of
(list_of(0)(0)(1))
(list_of(0)(1)(0))
(list_of(1)(0)(0));
(list_of(0)(0)(0));
return 0;
}
I'm trying to use a vector of strings in my code instead of an array of strings but apparently I miss some detail in the declaration of the vector. Using the following code, I get this error: ‘vector’ was not declared in this scope
// Try to implement a vector of string elements
#include<iostream>
using namespace std;
int main() {
const int MAX_ITEMS = 10;
vector<string> my_vector(MAX_ITEMS);
return 0;
}
How should I correctly declare the vector?
You should add these includes:
#include <vector>
#include <string>
You have to include the header:
#include <vector>
#include <string>
You need:
#include <vector>