D 编程 - 嵌套 if 语句



在 D 编程中,始终允许嵌套 if-else 语句,这意味着您可以在另一个 if 或 else if 语句中使用一个 if 或 else if 语句。

语法

嵌套 if 语句的语法如下:

if( boolean_expression 1) { 
   /* Executes when the boolean expression 1 is true */ 
   if(boolean_expression 2) { 
      /* Executes when the boolean expression 2 is true */
   }
}

您可以像嵌套if语句一样,以类似的方式嵌套else if...else

示例

import std.stdio;
 
int main () { 
   /* local variable definition */ 
   int a = 100; 
   int b = 200; 
  
   /* check the boolean condition */ 
   if( a == 100 ) { 
      /* if condition is true then check the following */ 
      if( b == 200 ) { 
         /* if condition is true then print the following */ 
         writefln("Value of a is 100 and b is 200" ); 
      } 
   } 
   writefln("Exact value of a is : %d", a ); 
   writefln("Exact value of b is : %d", b ); 
  
   return 0; 
}

编译并执行上述代码时,会产生以下结果:

Value of a is 100 and b is 200 
Exact value of a is : 100 
Exact value of b is : 200 
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