C语言算术运算符

#include <stdio.h>

main() {

   int a = 21;
   int b = 10;
   int c ;

   c = a + b;
   printf("line 1 - Value of c is %d\n", c );

   c = a - b;
   printf("line 2 - Value of c is %d\n", c );

   c = a * b;
   printf("line 3 - Value of c is %d\n", c );

   c = a / b;
   printf("line 4 - Value of c is %d\n", c );

   c = a % b;
   printf("line 5 - Value of c is %d\n", c );

   c = a++; 
   printf("line 6 - Value of c is %d\n", c );

   c = a--; 
   printf("line 7 - Value of c is %d\n", c );
}