D語言邏輯運算符

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爲非零，則條件變爲真。

(A && B) is false.

||

所謂邏輯或運算符。如果任何兩個操作數爲非零，則條件變爲真。

(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。如果條件爲真，則邏輯NOT運算符將爲false。

!(A && B) is true.

示例

試試下面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