Thread: Calling a function from another file

Hello, im having trouble using a function from another file in a project,
this is a example from my book:
Calling a function with only a prototype:

Code:

#include <iostream>

using namespace std;

void BigDog(int KibblesCount);

int main()
{
    BigDog(3);
    return 0;
}

Using a function from a seperate file:

Code:

#include <iostream>

using namespace std;

void BigDog(int KibblesCount)
{
    cout << "I'm a lucky dog" << endl;
    cout << "I have " << KibblesCount << " pieces of food" << endl;
}

i know how this example works but, i tried making my own:

I make a prototype and made the function:

Code:

#include <iostream>
using namespace std;

int Sum(int x,int y);

int main(){
cout << "Type 2 numbers" << endl;
cout << Sum(30,20) << endl;
}
int Sum(int x,int y){

 int result;

 result = x + y;
 return result;
    
}

Here i tried making the file where i was going to use the Sum(int x,int y) function:

Code:

#include <iostream>

using namespace std;

int Sum(int x,int y)
{
    cout << "The number is " << Sum(x,y) << endl;
}

but i dont know how to program this file so it'll be able to use the Sum function.

Any help?

Originally Posted by g4j31a5

What IDE are you using? If you use Visual C++ or CodeBlocks, just add a new header and source files (a .h and a .cpp files) into the project. And then in your main source file (ie. the one with your "int main()" block), insert an include statement of the header file (eg. #include "foo.h") and you're all set. However, if you are using vi or notepad for this (well I know some people who swear that vi is da bomb :P ), you need to manually link the files yourself.

i just reread my book and now i get it LOL, i should read slower next time ;P