下表列出了所有D语言支持的逻辑运算符。假设变量A=1和变量B=0，则：

运算符	描述	实例
&&	所谓逻辑AND运算符。如果这两个操作数都为非零，则条件变为真。	(A && B) is false.
||	所谓逻辑或运算符。如果任何两个操作数为非零，则条件变为真。	(A || B) is true.
!	所谓逻辑非运算符。使用反转其操作数的逻辑状态。如果条件为真，则逻辑NOT运算符将为false。	!(A && B) is true.

示例

试试下面的例子就明白了所有的D编程语言的逻辑运算符：

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;
}

当编译并执行上面的程序它会产生以下结果：

Line 1 - Condition is true

Line 2 - Condition is true

Line 3 - Condition is not true

Line 4 - Condition is true

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