下表列出了所有D語言支持的邏輯運算符。假設變數A=1和變數B=0，則：
| 運算符 | 描述 | 實例 |
|---|---|---|
| && | 所謂邏輯AND運算符。如果這兩個運算元都為非零，則條件變為真。 | (A && B) is false. |
| || | 所謂邏輯或運算符。如果任何兩個運算元為非零，則條件變為真。 | (A || B) is true. |
| ! | 所謂邏輯非運算符。使用反轉其運算元的邏輯狀態。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; }
當編譯並執行上面的程式它會產生以下結果：
Line 1 - Condition is true Line 2 - Condition is true Line 3 - Condition is not true Line 4 - Condition is true