下表列出了所有D語言支持的邏輯運算符。假設(shè)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(shù)都為非零,則條件變?yōu)檎妗?/td> | (A && B) is false. |
|| | 所謂邏輯或運算符。如果任何兩個操作數(shù)為非零,則條件變?yōu)檎妗?/td> | (A || B) is true. |
! | 所謂邏輯非運算符。使用反轉(zhuǎn)其操作數(shù)的邏輯狀態(tài)。如果條件為真,則邏輯NOT運算符將為false。 | !(A && B) is true. |
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(dāng)編譯并執(zhí)行上面的程序它會產(chǎn)生以下結(jié)果:
Line 1 - Condition is true Line 2 - Condition is true Line 3 - Condition is not true Line 4 - Condition is true