D语言嵌套switch语句

一个switch可以作为外部switch的语句序列的一部分。即使内部和外部switch的case，常含有共同的值，冲突也不会产生。

语法

嵌套switch语句的语法如下：

switch(ch1) {
   case &aposA&apos: 
      writefln("This A is part of outer switch" )
      switch(ch2) {
         case &aposA&apos:
            writefln("This A is part of inner switch" )
            break
         case &aposB&apos: /* case code */
      }
      break
   case &aposB&apos: /* case code */
}

例子：

import std.stdio

int main ()
{
   /* local variable definition */
   int a = 100
   int b = 200

   switch(a) {
      case 100:
         writefln("This is part of outer switch", a )
         switch(b) {
            case 200:
               writefln("This is part of inner switch", a )
               default:
                    break
         }
       default:
          break
   }
   writefln("Exact value of a is : %d", a )
   writefln("Exact value of b is : %d", b )
 
   return 0
}

让我们编译和运行上面的程序，这将产生以下结果：

This is part of outer switch
This is part of inner switch
Exact value of a is : 100
Exact value of b is : 200

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