C++ LANGUAGE NESTED SWITCH STATEMENT PAGE 63

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C++ LANGUAGE NESTED SWITCH STATEMENT

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