Objective-C 嵌套switch語句
這是可能switch 的一部分的外switch 語句序列。即使case常量的內部和外部的switch 含有共同值沒有衝突就會出現。
語法：
嵌套switch語句的語法如下：
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; }
讓我們編譯和運行上面的程序，這將產生以下結果：
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