if...else 语句

#include <stdio.h>



int main () {



   /* local variable definition */

   int a = 100;



   /* check the boolean condition */

   if( a < 20 ) {

      /* if condition is true then print the following */

      printf("a is less than 20\n" );

   } else {

      /* if condition is false then print the following */

      printf("a is not less than 20\n" );

   }



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



   return 0;

}