So I am using Visual Studio to make a simple program for intro to Object Oriented Programming. I am using C++ language to do this, in Netbeans with JAVA OPP isn't so complicated but I am having trouble here. I have to make a simple Object, I chose to make my object called Movie. I made a Movie.h and Movie.cpp file. I included .h's extensions to my Movie.cpp and main.cpp but when I create the object in my main or try to i keep getting errors and underlines because my .cpp file is not recognizing my variables declared in .h, it keeps saying the variable is undefined.
So visual studio's wants to help me out and I followed their method so in my .h files they said they will define my methods for me, meaning they will set it up for me and when I clicked it i get this format
string Movie::getName()
{
return string();
}
While I am using this format for this function
string getName(){
return name;
}
My variables keeps getting red underlined saying they are undefined.
My Movie.h file
#pragma once
//Header File is where all of your class defenitions will go.
class Movie
{
private:
string name;
int length;
double rating;
public:
//Constructors
//A Default constructor
Movie();
//A Constructor that takes in 3 values, an int, a double and a string
Movie(int x, double y, string z );
//Get fucntions
//Get fucntions will get the required values.
string getName();
int getLength();
double getRating();
//Set functions
//Set fucntions will set the variables to the input values.
void setName(string x);
void setLength(int y);
void setRating(double z);
//toString Function
//A toString function that will display the details of the object
void toString();
};
My Movie.cpp File
#include "Movie.h"
#include "pch.h"
#include <iostream>
#include <string>
using namespace std;
//Default Construtor
Movie::Movie()
{
}
//A Construtor that takes in 3 values, int for length, double for rating, string for name
Movie::Movie(int x, double y, string z)
{
setLength(x);
setRating(y);
setName(z);
}
//Set functions
void setLength(int x) {
length = x;
}
void setRating(double y) {
rating = y;
}
void setName(string z) {
name = z;
}
//Get functions
int getLength() {
return length;
}
double getRating() {
return rating;
}
string getName() {
return name;
}
My .main
#include "pch.h"
#include <iostream>
#include "Movie.h"
#include <string>
using namespace std;
int main()
{
Movie mo1();
mo1.setName("Inceptio");
mo1.setLength(123);
cin.ignore(1);
return 0;
}
Now I havent worked on my toString method yet but I can't because I cant figure out what the real problem is, why is my .cpp not recognizing my variables? Is my format wrong? Is the visual studio's format right because I ran with their format and got bunch of errors as well or am I declaring them wrong or something? Thank you!
Main.cpp
//#include "pch.h"
#include <iostream>
#include "Movie.h"
#include <string>
using namespace std;
int main()
{
Movie mo1;
mo1.setName("Inceptio");
mo1.setLength(123);
cin.ignore(1);
return 0;
}
Movie.h
#pragma once
#ifndef Movie_H
#define Movie_H
#include <string>
#include <iostream>
using namespace std;
//Header File is where all of your class defenitions will go.
class Movie
{
private:
string name;
int length;
double rating;
public:
//Constructors
//A Default constructor
Movie();
//A Constructor that takes in 3 values, an int, a double and a string
Movie(int x, double y, string z);
//Get fucntions
//Get fucntions will get the required values.
string getName();
int getLength();
double getRating();
//Set functions
//Set fucntions will set the variables to the input values.
void setName(string x);
void setLength(int y);
void setRating(double z);
//toString Function
//A toString function that will display the details of the object
void toString();
};
#endif
Movie.cpp
#include "Movie.h"
//#include "pch.h"
#include <iostream>
#include <string>
using namespace std;
//Default Construtor
Movie::Movie()
{
}
//A Construtor that takes in 3 values, int for length, double for rating, string for name
Movie::Movie(int x, double y, string z)
{
setLength(x);
setRating(y);
setName(z);
}
//Set functions
void Movie::setLength(int x) {
length = x;
}
void Movie::setRating(double y) {
rating = y;
}
void Movie::setName(string z) {
name = z;
}
//Get functions
int Movie::getLength() {
return length;
}
double Movie::getRating() {
return rating;
}
string Movie::getName() {
return name;
}
Related
My first ever c++ program and i cant seem to figure out why it says that my 'object' was not declared in the scope. I've included the header files, i've prototyped my functions. i'm used to coding in java and the separation is pretty confusing to me.
The aim of the program is simple: create a class: Semester.
Semester: will have ID, name, credit, marks.
provide get/set methods to input and output from kb
Main
#include <iostream>
#include <stdio.h>
#include "Semester.h"
using namespace std;
int main()
{
Semester s1;
cout << "Please enter ID" << endl;
cin >> sl.setid();
cout << "ID: " << s1.getid();
}
cpp
#include <stdio.h>
#include <iostream>
#include "Semester.h"
using namespace std;
Semester::Semester(){
}
//setters
void Semester::setid(string t_id) {id = t_id;}
void Semester::setunit(string t_name) {unit_name = t_name;}
void Semester::setcredit(int t_credit){credit = t_credit;}
void Semester::setmark(int t_marks) {marks = t_marks;}
//getters
string Semester::getid() {return id;}
string Semester::getunit() {return unit_name;}
int Semester::getcredit() {return credit;}
int Semester::getmark() {return marks;}
header
#ifndef SEMESTER_H
#define SEMESTER_H
#include <stdio.h>
#include <iostream>
class Semester{
private: //variables
std::string id;
std:: string unit_name;
int credit, marks;
public:
Semester(); //constructor
//setters
void setid(std::string id);
void setunit(std::string name);
void setcredit(int credit);
void setmark(int marks);
//getters
std::string getid();
std::string getunit();
int getcredit();
int getmark();
};
#endif // SEMESTER_H
The following line is incorrect.
cin >> sl.setid();
Problems with that line:
You are calling a function that expects an argument with no arguments.
The return type of setid() is void. That cannot be used as the RHS of the stream extraction function.
What you need is:
std::string id;
cin >> id;
s1.setid(id);
Suggestion for improvement: Make all the get functions const member functions.
//getters
std::string getid() const;
std::string getunit() const;
int getcredit() const;
int getmark() const;
Make sure to update the .cpp file accordingly.
I'm still a noobie in c++ so I am not to skilled in debugging yet. Just trying to figure out how to fix this compilation error.
CruiseShip.cpp:11: error: expected ‘)’ before ‘n’
CruiseShip.cpp
#include "CruiseShip.h"
#include "Ship.h"
#include <iostream>
using namespace std;
Ship s;
int passengers;
CruiseShip(string n, string y, int p) : Ship(n,y)
{
passengers=p;
}
void print()
{
cout<<"Name: "<<s.getName()<<"\nMaximum passengers:"<<passengers<<endl;
cout<<"-------------------------"<<endl;
}
CruiseShip.h
#ifndef CRUISESHIP_H
#define CRUISESHIP_H
#include "Ship.h"
#include <string>
using namespace std;
//class Ship;
class CruiseShip:public Ship{
private:
int passengers;
Ship::Ship s;
public:
CruiseShip(string, string, int);
virtual void print();
};
#endif
Ship.h
#ifndef SHIP_H
#define SHIP_H
#include <string>
using namespace std;
class Ship{
private:
string name;
string built;
public:
Ship();
Ship(string, string);
string getName();
string getBuilt();
virtual void print();
};
#endif
You have 3 errors:
1 and 2. You don't declare print and CruiseShip (The constructor) as part of the class CruiseShip when you define them. You need to:
CruiseShip::CruiseShip(string n, string y, int p) : Ship(n,y) {
virtual void CruiseShip::print() {
3, you dont have a namespace Ship so this is unnecessary:
Ship::Ship s; // This only needs to be Ship s <- NameSpace::ObjectType nameOfObject;
After this it will compile http://ideone.com/wJ6mPO. It will not link however, because you have undefined references to all of the functions you have yet to define.
So, I tried to make this code :
#include <iostream>
using namespace std;
class BuckysClass{
public:
void setName(string x){
name = x;
}
string getName(){
return name;
}
private:
string name;
};
int main()
{
BuckysClass bo;
bo.setName("Buckingham Palace");
cout << bo.getName();
return 0;
}
BECOMING TO A SEPARATED CLASS like this :
#include "BuckysClass.h"
#include <iostream>
#include <string>
using namespace std;
int main (){
BuckysClass bo;
bo.setName("Buckingham Palace");
cout << bo.getName();
return 0;
}
==============
#ifndef BUCKYSCLASS_H
#define BUCKYSCLASS_H
class BuckysClass
{
public:
void setName(string x);
string getName();
private:
string name;
};
#endif // BUCKYSCLASS_H
=============
#include "BuckysClass.h"
#include <iostream>
#include <string>
using namespace std;
BuckysClass::BuckysClass()
{
}
void setName(string x){
name = x;
}
string getName(){
return name;
}
When I run the first code, I succeed,
but I got error when running the separated class code,
help me find out what's wrong ???
I tried to use different code,
but it seems I can't find the reason,
the closest reason I believe, is the main doesnt call the function on the separated class properly.
If you write this code:
void setName(string x){
name = x;
}
string getName(){
return name;
}
The compiler interprete it as two functions called setName and getName, it has no idea they are member functions of your BuckysClass class.
You have to precise it with the following syntax:
void BuckysClass::setName(string x){
name = x;
}
string BuckysClass::getName(){
return name;
}
Additionally, here you are defining a default constructor:
BuckysClass::BuckysClass()
{
}
But you didn't put it in the class prototype. You have to add it somewhere in the class prototype definition in your .h file, or your compiler won't recognize it:
class BuckysClass
{
public:
BuckysClass(); // Default constructor.
void setName(string x);
string getName();
private:
string name;
};
I'm trying to make a "grade book".
I have a header file (GradeBook.h), and a main.cpp file.
I'm having trouble getting the value of a "midtermExamGrade" value to pass given the follow parameters:
GradeBook.h file:
#include <string>
#include <iostream>
using namespace std;
class GradeBook
{
public:
void setMidtermExamGrade(double grade)
{
double midterm_exam_grade = grade;
}
double getMidtermExamGrade()
{
return midterm_exam_grade;
}
private:
double grade;
} //end class GradeBook
Your private member is not being initialized correctly because your setter and getter are wrong. Try this:
#include <string>
#include <iostream>
using namespace std;
class GradeBook
{
public:
void setMidtermExamGrade(double grade)
{
midterm_exam_grade = grade; // use the private member
}
double getMidtermExamGrade()
{
return midterm_exam_grade;
}
private:
double midterm_exam_grade; // change here to match tha names in setter and getter
} //end class GradeBook
I'm trying to reference an object in a function and it is giving me an "Object is inaccessible" error. Here is the header and cpp file in question.
customer header file below. I've put the object declaration at the bottom.
#pragma once
#include "bankAccount.h"
#include "checkingAccount.h"
#include "savingsAccount.h"
#include "address.h"
using namespace std;
class customer {
public:
customer(void);
customer(string,string);
~customer(void);
void setName(string n);
string getName();
void withdrawChecking(double);
void wihdrawSavings(double);
double depositSavings(double);
string print();
private:
string name
checkingAccount myChecking;
savingsAccount mySavings;
};
Here is the cpp file. I've bolded the problem statement.
#include "customer.h"
#include "checkingAccount.h"
customer::customer(void){
}
customer::customer(string n, string ac){
name = n;
mySavings.setAccount(ac);
myChecking.setAccount(ac);
}
void customer::setName(string n){
name = n;
}
string customer::getName(){
return name;
}
void withdrawChecking(double w){
myChecking.withdrawChecking(w);
}
So what is wrong with this last statement and my header?
Sorry for bad styling... first time posting a question.
You're missing a customer on the front of withdrawChecking. It should be:
void customer::withdrawChecking(double w)