I am trying to create a function that returns in main.cpp in the header and .cpp file and run it in the main function.
This process I do works on main.
#include <iostream>
#include <sstream>
#include "Cards.h"
using namespace std;
//this function returns array
int *function1(){
int a=12;
int b=13;
int c=14;
static int list[3]={a,b,c};
return list;
}
int main(int argc, const char * argv[]) {
int *list;
list=function1();
cout<<list[1]<<endl;
return 0;
}
However, I cannot do these in a header and a separate cpp file.
I have a Cards header
#ifndef Cards_H
#define Cards_H
#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
class Cards{
public:
char suit; //A,H,D,C,S. A is empty card
int number; //00-13
int visibilty;//0 - 1. O invisible 1 is visible
int * function2();
};
#endif
This is the class cpp file
#include "Cards.h"
using namespace std;
//function
int Cards:: function2(){
int a=12;
int b=13;
int c=14;
int list[3]={a,b,c};
return list; // error code Cannot initialize return object of type 'int Cards::*' with an lvalue of type 'int [3]'
}
How do I fix this problem and run it in main?
As pointed out in the comments, there is already a SO thread
which handles your issue.
If your really want to use C
arrays then your program shall look like:
Cards_CStyle.h:
#ifndef Cards_CStyle_H
#define Cards_CStyle_H
using namespace std;
class Cards {
public:
int* function2(int arr[]);
};
#endif
Cards_CStyle.cpp:
#include "Cards_CStyle.h"
using namespace std;
//function
int* Cards::function2(int arr[]){
int a=12, b=13, c=14;
arr[0] = a;
arr[1] = b;
arr[2] = c;
return arr;
}
main_CStyle.cpp:
#include <iostream>
#include "Cards_CStyle.h"
using namespace std;
int main(int argc, const char * argv[]) {
int arr[3]; // Take care that all your functions use size <= 3
Cards cards;
int* list=cards.function2(arr);
cout<<list[1]<<endl;
return 0;
}
As recommended in the comments, you should use the containers of the STL, eg array
for fixed length or vector
for variable length. Assuming that fixed length of 3 will be fine for you, then your code would be looking like this:
Cards_STLStyle.h:
#ifndef Cards_STLStyle_H
#define Cards_STLStyle_H
#include<array>
using namespace std;
typedef array<int, 3> my_array;
class Cards {
public:
my_array function2();
};
#endif
Cards_STLStyle.cpp:
#include "Cards_STLStyle.h"
using namespace std;
//function
my_array Cards::function2(){
int a=12, b=13, c=14;
return my_array { a,b,c};
}
main_STLStyle.cpp:
#include <iostream>
#include <array>
#include "Cards_STLStyle.h"
using namespace std;
int main(int argc, const char * argv[]) {
Cards cards;
my_array list=cards.function2();
cout<<list[1]<<endl;
return 0;
}
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