D 程式設計 - 關係運算符

下表顯示了 D 語言支援的所有關係運算符。假設變數A的值為 10，變數B的值為 20，則 -

運算子	描述	示例
==	檢查兩個運算元的值是否相等，如果相等則條件為真。	(A == B) 為假。
!=	檢查兩個運算元的值是否不相等，如果不相等則條件為真。	(A != B) 為真。
>	檢查左運算元的值是否大於右運算元的值，如果是則條件為真。	(A > B) 為假。
<	檢查左運算元的值是否小於右運算元的值，如果是則條件為真。	(A < B) 為真。
>=	檢查左運算元的值是否大於或等於右運算元的值，如果是則條件為真。	(A >= B) 為假。
<=	檢查左運算元的值是否小於或等於右運算元的值，如果是則條件為真。	(A <= B) 為真。

示例

嘗試以下示例以瞭解 D 程式語言中可用的所有關係運算符 -

線上演示

import std.stdio;
  
int main(string[] args) { 
   int a = 21; 
   int b = 10; 
   int c ;  
   
   if( a == b ) { 
      writefln("Line 1 - a is equal to b\n" ); 
   } else { 
      writefln("Line 1 - a is not equal to b\n" );
   } 
   
   if ( a < b ) { 
      writefln("Line 2 - a is less than b\n" ); 
   } else { 
      writefln("Line 2 - a is not less than b\n" ); 
   } 
   
   if ( a > b ) { 
      writefln("Line 3 - a is greater than b\n" ); 
   } else { 
      writefln("Line 3 - a is not greater than b\n" ); 
   } 
   
   /* Lets change value of a and b */ 
   a = 5; 
   b = 20; 
   
   if ( a <= b ) { 
      writefln("Line 4 - a is either less than or equal to b\n" ); 
   } 
   if ( b >= a ) { 
      writefln("Line 5 - b is either greater than or equal to b\n" ); 
   } 
   return 0; 
}

編譯並執行上述程式後，將產生以下結果 -

Line 1 - a is not equal to b 
 
Line 2 - a is not less than b
  
Line 3 - a is greater than b
  
Line 4 - a is either less than or equal to b
  
Line 5 - b is either greater than or equal to b

d_programming_operators.htm

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