编辑代码

#include <iostream>
using namespace std;
int add(int x, int y)
{
  return x + y;
}
int main()
{ 
  int m=2, n=3;
  cout << " 1: " << add(m++, m+n ) << end1;
  m=2, n=3;
  cout << " 2: " << add( ++m,m+n ) << end1;
  m=2,n=3;
  cout << " 3: " << end1;
  m=2,n=3;
  cout << " 4: " << end1;
  return 0;
}