C++ nested switch statements

It is possible to have a switch as part of the statement sequence of an outer switch. Even if the case constants of the inner and outer switch contain common values, no conflicts will arise.

C++ specifies that at least 256 levels of nesting be allowed for switch statements.

Syntax

The syntax for a nested switch statement is as follows −

 switch(ch1) { case 'A': cout << "This A is part of outer switch"; switch(ch2) { case 'A': cout << "This A is part of inner switch"; break; case 'B': // ... } break; case 'B': // ... } 

Example

 #include <iostream> using namespace std; int main () { // local variable declaration: int a = 100; int b = 200; switch(a) { case 100: cout << "This is part of outer switch" << endl; switch(b) { case 200: cout << "This is part of inner switch" << endl; } } cout << "Exact value of a is : " << a << endl; cout << "Exact value of b is : " << b << endl; return 0; } 

This would produce the following result −

 This is part of outer switch This is part of inner switch Exact value of a is : 100 Exact value of b is : 200