Operating with variable in C++

// operating with variables

#include <iostream>

using namespace std;

int main ()

{

  // declaring variables:

  int a, b;

  int result;

  // process:

  a = 5;

  b = 2;

  a = a + 1;

  result = a - b;

  // print out the result:

  cout << result;

  // terminate the program:

  return 0;

}