#include <stdio.h>  
void main () {  
   int i = 10;  
   int j = 20;  
   switch(i) {  
      case 10:   
         printf("the value of i evaluated in outer switch: %d\n",i);  
      case 20:  
         switch(j) {  
            case 20:  
               printf("The value of j evaluated in nested switch: %d\n",j);  
         }  
   }          printf("Exact value of i is : %d\n", i );  
   printf("Exact value of j is : %d\n", j );  
   
}