Nested switch

A case alternative within a switch can be associated with any sequence of statements, which might include other switch statements. For example: 
int a;
cin >> a;

switch(a)
{
case 1:

     cout << "Enter a character, please ";
     char b;
     cin >> b;
     switch(b)
     {
        .
        .
        .
     }
    break;
case 2:
     cout << "you entered 2";
     break;
case 3:
     cout << "you entered 3";
     break;
default:
     cout << "you did not enter either 1, 2 or 3";
}
if a’s value is 1, a value for b is read and the second switch statement is executed.

Example


#include <iostream>
using namespace std;

int main()
{   
     cout << "Enter a value, please ";
     int a;
     cin >> a;
     switch(a)
     {
     case 1:
           cout << "Enter a character, please ";
           char b;
           cin >> b;
           switch(b)
           {
           case 'a':
                cout << "you entered \'a\'";
                break;
           case 'b':
                cout << "you entered \'b\'";
                break;
           default:
                cout << "you entered neither \'a\' nor \'b\'";
           }
         break;
     case 2:
           cout << "you entered 2";
           break;
     case 3:
           cout << "you entered 3";
           break;
     default:
           cout << "you did not enter either 1, 2 or 3";
     }
}

(Possible) Output

Enter a value, please 1
Enter a character, please d
you entered neither 'a' nor 'b'