D Programming - Logical Operators


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The following table shows all the logical operators supported by D language. Assume variable A holds 1 and variable B holds 0, then −

Operator Description Example
&& It is called Logical AND operator. If both the operands are non-zero, then condition becomes true. (A && B) is false.
|| It is called Logical OR Operator. If any of the two operands is non-zero, then condition becomes true. (A || B) is true.
! It is called Logical NOT Operator. Use to reverses the logical state of its operand. If a condition is true then Logical NOT operator will make false. !(A && B) is true.

Example

Try the following example to understand all the logical operators available in D programming language −

import std.stdio;

int main(string[] args) {
   int a = 5;
   int b = 20;
   int c ;

   if ( a && b ) {
      writefln("Line 1 - Condition is true\n" );
   }
   if ( a || b ) {
      writefln("Line 2 - Condition is true\n" );
   }
   /* lets change the value of a and b */

   a = 0; 
   b = 10; 

   if ( a && b ) { 
      writefln("Line 3 - Condition is true\n" ); 
   } else { 
      writefln("Line 3 - Condition is not true\n" ); 
   } 
   
   if ( !(a && b) ) { 
      writefln("Line 4 - Condition is true\n" ); 
   } 
   return 0;
}

When you compile and execute the above program it produces the following result −

Line 1 - Condition is true 
 
Line 2 - Condition is true
  
Line 3 - Condition is not true
  
Line 4 - Condition is true
d_programming_operators.htm
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