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：
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运算符
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描述
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实例
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&&
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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。
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(A && B) is false.
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||
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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。
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(A || B) is true.
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!
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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。
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!(A && B) is true.
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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
