C++ Can you explain return type functions?

Are you asking about either the return type on functions or functions that have a return type, instead of being void?

In C and C++ functions have the option of returning a value after their execution has completed. The return type tells the compiler what type of data will be returned just like when you're declaring a variable. Here are some examples.

#include <iostream>

using namespace std;

// just print out what we're doing

void print_div( int a, int b) {

cout << a << " / " << b << endl;

}

// return the result of integer division

int div( int a, int b ) {

int c;

c=a/b;

return c;

}

// a shorter version

int optimized_div( int a, int b ) {

return a/b;

}

// use double-precision floating point math to achieve a more precise answer

double float_div( int a, int b ) {

return (double)a/(double)b

}

I can't do better job explaining it than this:

http://www.cplusplus.com/doc/tutorial/functions/