IF .... ELSE , STATEMENT

#include <stdio.h>
int main ()
{    
 int a = 100;   /* local variable definition */
 if( a < 20 )     /* check the boolean condition */
 {     /* 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;
}
output :
a is not less than 20;
value of a is : 100