C++ :

#include <iostream>
#include <cstdio>
using namespace std;
int main()
{
    int x1,x2,ans;
    cin>>x1>>x2;
    if(x1<x2)
    {
        ans=x1+x2;
    }
    else if(x1>x2)
    {
        ans=x1-x2;
    }
    else
    {
        //相等
        ans=x1*x2;
    }
    cout<<ans<<endl;
    return 0;
}

Pascal :

var
  a,b,m:longint;
begin
  readln(a,b);
  if a<b then m:=a+b;
  if a>b then m:=a-b;
  if a=b then m:=a*b;
  writeln(m);
end.