INCREMENT AND DECREMENT OPERATORS IN C ( ++ , -- )

/* all increment and decrement operators in C ( ++ , -- ) */

#include <stdio.h>
void main()
{
 int a = 21;
 int c ;
 c = a++;
 printf("Line 1 - Value of c is %d\n", c );
 c = a--;
 printf("Line 2 - Value of c is %d\n", c );
}

output :
Line 1 - Value of c is 22
Line 2 - Value of c is 20