Thread: Functions

from the function tutorial on this site, I understand how they work but what I dont get is the placement of it, for example

Code:

#include <iostream>
int mult(int x, int y) {return x*y;}
int main()
{
    int x,y;
    std::cin>>x>>y;
    std::cout<<mult(x,y)<<std::endl;
    system("PAUSE");
    return 0;
}

In the example on the tutorial it had return at the end but that's for making blueprints of a program so I put it with the mult function before main() and it worked but I tried sticking main in front of the mult function and the program no longer works and im getting errors such as a parse error before int on the 3rd line, but why?