cppreference.com > C/C++ Keywords > switch
switch
Syntax:
  switch( expression ) {
  case A:
  statement list;
  break;
  case B:
  statement list;
  break;
  ...
  case N:
  statement list;
  break;
  default:
  statement list;
  break;
  }

The switch statement allows you to test an expression for many values, and is commonly used as a replacement for multiple if()...else if()...else if()... statements. break statements are required between each case statement, otherwise execution will "fall-through" to the next case statement. The default case is optional. If provided, it will match any case not explicitly covered by the preceding cases in the switch statement. For example:

   char keystroke = getch();
   switch( keystroke ) {
     case 'a':
     case 'b':
     case 'c':
     case 'd':
       KeyABCDPressed();
       break;
     case 'e':
       KeyEPressed();
       break;
     default:
       UnknownKeyPressed();
       break;
   }