D 编程 - 关系运算符

下表列出了D语言支持的所有关系运算符。假设变量A为 10，变量B为 20，则 -

操作员	描述	例子
==	检查两个操作数的值是否相等，如果相等则条件为真。	(A == B) 不正确。
!=	检查两个操作数的值是否相等，如果值不相等则条件成立。	(A != B) 为真。
>	检查左操作数的值是否大于右操作数的值，如果是，则条件为真。	(A > B) 不正确。
<	检查左操作数的值是否小于右操作数的值，如果是，则条件为真。	(A < B) 为真。
>=	检查左操作数的值是否大于或等于右操作数的值，如果是，则条件为真。	(A >= B) 不正确。
<=	检查左操作数的值是否小于或等于右操作数的值，如果是，则条件为真。	(A <= B) 为真。

例子

尝试以下示例来了解 D 编程语言中可用的所有关系运算符 -

现场演示

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; 
}

当您编译并执行上述程序时，它会产生以下结果 -

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