Objective-C 嵌套 switch 语句

可以将 switch 作为外部 switch 语句序列的一部分。即使内部和外部 switch 的 case 常量包含公共值，也不会产生冲突。

语法

嵌套 switch 语句的语法如下:

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 */
}

实例

#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\n", a );
     switch(b) {
      case 200:
        NSLog(@"This is part of inner switch\n", a );
     }
  }
  NSLog(@"Exact value of a is : %d\n", a );
  NSLog(@"Exact value of b is : %d\n", b );
  return 0;
}

结果如下:

2022-07-07 22:09:20.947 demo[21703] This is part of outer switch
2022-07-07 22:09:20.948 demo[21703] This is part of inner switch
2022-07-07 22:09:20.948 demo[21703] Exact value of a is : 100
2022-07-07 22:09:20.948 demo[21703] Exact value of b is : 200