C++ Function Definition Declare, call, and store a returned value

#include <iostream>
using namespace std;
int findMax(int, int);  // function prototype
int main()//  www . j  a  v a2s  . com
{
   int firstnum, secnum, max;
   cout << "\nEnter a number: ";
   cin  >> firstnum;
   cout << "Great! Please enter a second number: ";
   cin  >> secnum;
   max = findMax(firstnum, secnum);  // function is called here
   cout << "\nThe maximum of the two numbers is " << max << endl;
   return 0;
}
int findMax(int x, int y)
{                 // start of function body
   int maxnum;      // variable declaration
   if (x >= y)      // find the maximum number
      maxnum = x;
   else
      maxnum = y;
   return maxnum;   // return statement
}