C语言if语句

#include <stdio.h>

int main () {

   /* local variable definition */
   int a = 10;

   /* check the boolean condition using if statement */

   if( a < 20 ) {
      /* if condition is true then print the following */
      printf("a is less than 20/n" );
   }

   printf("value of a is : %d/n", a);

   return 0;
}