C++ variable processing

// Processing of  variables using addition and subrraction

#include <iostream>
using namespace std;

int main ()
{
  // declaring variables:
  int a, b;
  int result;

  // processing:
  a = 10;
  b = 10;
  a = a + 1;
  result = a - b;

  // printing :
  cout << result;

  return 0;
}