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可能一个switch作为另一个switch语句序列的一部分。即使在内外switch的case语句的常数包含共同的值,但是不会有冲突将出现。

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 */
}

例子:

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