C++算术运算符

#include <iostream>

using namespace std;

main() {
   int a = 21;
   int b = 10;
   int c ;

   c = a + b;
   cout << "Line 1 - Value of c is :" << c << endl ;

   c = a - b;
   cout << "Line 2 - Value of c is  :" << c << endl 
   ;
   c = a * b;
   cout << "Line 3 - Value of c is :" << c << endl ;

   c = a / b;
   cout << "Line 4 - Value of c is  :" << c << endl ;

   c = a % b;
   cout << "Line 5 - Value of c is  :" << c << endl ;

   c = a++; 
   cout << "Line 6 - Value of c is :" << c << endl ;

   c = a--; 
   cout << "Line 7 - Value of c is  :" << c << endl ;

   return 0;
}