C中的逻辑运算符

#include <stdio.h>



main() {



   int a = 5;

   int b = 20;

   int c ;



   if ( a && b ) {

      printf("Line 1 - Condition is true\n" );

   }



   if ( a || b ) {

      printf("Line 2 - Condition is true\n" );

   }



   /* lets change the value of  a and b */

   a = 0;

   b = 10;



   if ( a && b ) {

      printf("Line 3 - Condition is true\n" );

   } else {

      printf("Line 3 - Condition is not true\n" );

   }



   if ( !(a && b) ) {

      printf("Line 4 - Condition is true\n" );

   }



}