#include <stdio.h>

int main() 
{
    int a=10;
    int b=20;
    switch(a)
        {
            case 10:
        printf("outer switch \n");
        switch(b)
            {
                case 20:
                printf("inner switch \n");        
            }
        }
    printf("value of a : %d \n",a);
    printf("value of b : %d \n",b);
    return 0;
}