what does "( (x

this is a function.

int find(int x, int y){
    return( (x<y) ? 0 : (x-y) );
    }

when we execute find(x,find(x,y)) , it will give minimum of x and y. I'm not getting how this is executing to give the minimum. what does "( (x<y) ? 0 : (x-y) ) ." means in C++?