If...else if...else 语句

#include <stdio.h>



int main () {



   /* local variable definition */

   int a = 100;



   /* check the boolean condition */

   if( a == 10 ) {

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

      printf("Value of a is 10\n" );

   } else if( a == 20 ) {

      /* if else if condition is true */

      printf("Value of a is 20\n" );

   } else if( a == 30 ) {

      /* if else if condition is true  */

      printf("Value of a is 30\n" );

   } else {

      /* if none of the conditions is true */

      printf("None of the values is matching\n" );

   }



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



   return 0;

}