C++ Nested switch

Nested switch

When a switch is a part of the statement sequence of another switch, then it is called as nested switch statement. The inner switch and the outer switch constant may or may not be the same.

The syntax of the nested switch statement is;

switch (expression)

{

      case constant 1:

      statement(s);

      break;

           switch(expression)

           {

           case constant 1:

                   statement(s);

                             break;

           case constant 2:

                   statement(s);

                   break;

                   .

                   .

                   .

           default :

           statement(s);

      }

case constant 2:

statement(s);

break;

.

.

.

default :

statement(s);

}

The below program illustrates nested switch statement example. The outer switch checks for zero or non-zero and the inner switch checks for odd or even.

Illustration 10.10 C++ program to check for zero or non-zero and odd or even using  nested switch statement

#include <iostream>

using namespace std;

int main()

{

int a = 8;

cout<<"The Number is : " <<a <<endl;

switch (a)

      {

      case 0 :

      cout<<"The number is zero" <<endl;

      break;

      default:

      cout<<"The number is a non-zero integer" <<endl;

      int b = a % 2;

      switch (b)

      {

      case 0:

      cout<<"The number is even" <<endl;

      break;

      case 1:

      cout<<"The number is odd" <<endl;

      break;

      }

      }

return 0;

}

Output

The Number is : 8

The number is a non-zero integer

The number is even