function - Using multiple .cpp files in c++ program?

Question

I recently moved from Java for C++ but now when I am writing my application I'm not interested in writing everything of the code in the main function I want in main function to call another function but this other function is in another .cpp file.

Let me explain better if you wouldn't understand:
I have one file: main.cpp inside it I have main function.

I have the second file: second.cpp inside I have a function called second() I want to call this function called second() from my main function..

Any help?

Answer 1

You must use a tool called a "header". In a header you declare the function that you want to use. Then you include it in both files. A header is a separate file included using the #include directive. Then you may call the other function.

other.h

void MyFunc();

main.cpp

#include "other.h"
int main() {
    MyFunc();
}

other.cpp

#include "other.h"
#include <iostream>
void MyFunc() {
    std::cout << "Ohai from another .cpp file!";
    std::cin.get();
}