Show 例子 2

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2023-12-01

下表显示了D语言支持的所有关系运算符。 假设变量A保持10,变量B保持20,则 -

操作者描述
==检查两个操作数的值是否相等,如果是,则条件变为真。(A == B)不是真的。
!=检查两个操作数的值是否相等,如果值不相等则条件变为真。(A!= B)是真的。
>检查左操作数的值是否大于右操作数的值,如果是,则条件变为真。(A> B)不是真的。
<检查左操作数的值是否小于右操作数的值,如果是,则条件变为真。(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,则条件变为真。(A> = B)不是真的。
<=检查左操作数的值是否小于或等于右操作数的值,如果是,则条件变为真。(A <= B)是真的。

例子 (Example)

请尝试以下示例以了解D编程语言中可用的所有关系运算符 -

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; 
}

编译并执行上述程序时,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