鍍金池/ 教程/ C/ Objective-C 嵌套switch語(yǔ)句
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Objective-C 嵌套switch語(yǔ)句

這是可能switch 的一部分的外switch 語(yǔ)句序列。即使case常量的內(nèi)部和外部的switch 含有共同值沒(méi)有沖突就會(huì)出現(xiàn)。

語(yǔ)法：

嵌套switch語(yǔ)句的語(yǔ)法如下：

switch(ch1) {
   case 'A': 
      printf("This A is part of outer switch" );
      switch(ch2) {
         case 'A':
            printf("This A is part of inner switch" );
            break;
         case 'B': /* case code */
      }
      break;
   case 'B': /* case code */
}

例子：

#import <Foundation/Foundation.h>
 
int main ()
{
   /* local variable definition */
   int a = 100;
   int b = 200;
 
   switch(a) {
      case 100: 
         NSLog(@"This is part of outer switch
", a );
         switch(b) {
            case 200:
               NSLog(@"This is part of inner switch
", a );
         }
   }
   NSLog(@"Exact value of a is : %d
", a );
   NSLog(@"Exact value of b is : %d
", b );
 
   return 0;
}

讓我們編譯和運(yùn)行上面的程序，這將產(chǎn)生以下結(jié)果：

2013-09-07 22:09:20.947 demo[21703] This is part of outer switch
2013-09-07 22:09:20.948 demo[21703] This is part of inner switch
2013-09-07 22:09:20.948 demo[21703] Exact value of a is : 100
2013-09-07 22:09:20.948 demo[21703] Exact value of b is : 200