下表列出了所有D語言支持的邏輯運算符。假設變量A=1和變量B=0，則：

運算符	描述	實例
&&	所謂邏輯AND運算符。如果這兩個操作數都為非零，則條件變為真。	(A && B) is false.
||	所謂邏輯或運算符。如果任何兩個操作數為非零，則條件變為真。	(A || B) is true.
!	所謂邏輯非運算符。使用反轉其操作數的邏輯狀態。如果條件為真，則邏輯NOT運算符將為false。	!(A && B) is true.

示例

試試下麵的例子就明白了所有的D編程語言的邏輯運算符：

import std.stdio;

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

   if ( a && b )
   {
      writefln("Line 1 - Condition is true
" );
   }
   if ( a || b )
   {
      writefln("Line 2 - Condition is true
" );
   }
   /* lets change the value of  a and b */
   a = 0;
   b = 10;
   if ( a && b )
   {
      writefln("Line 3 - Condition is true
" );
   }
   else
   {
      writefln("Line 3 - Condition is not true
" );
   }
   if ( !(a && b) )
   {
      writefln("Line 4 - Condition is true
" );
   }
   return 0;
}

當編譯並執行上麵的程序它會產生以下結果：

Line 1 - Condition is true

Line 2 - Condition is true

Line 3 - Condition is not true

Line 4 - Condition is true