C++/Language/Switch

A switch statement in action

<source lang="cpp">

1. include <iostream>

using namespace std; int main(void) {

  char grade;
  cout << "Enter your grade: ";
  cin >> grade;
  switch (grade)
  {
  case "A":
     cout << "Your average must be between 90 - 100" 
          << endl;
     break; 
  case "B":
     cout << "Your average must be between 80 - 89" 
          << endl;
     break;
  case "C":
     cout << "Your average must be between 70 - 79" 
          << endl;
     break;
  case "D":
     cout << "Your average must be between 60 - 69" 
          << endl;
     break;
  default: 
     cout << "Your average must be below 60" << endl;
  }
  return 0;

}

      </source>

Deliberately falls through the case

<source lang="cpp">

1. include <iostream>

using namespace std; int main(void) {

  char choice;
  cout << "Choose your car\n";
  cout << "S \n";
  cout << "L \n";
  cout << "D \n";
  cin >> choice;
  cout << "Extra features purchased\n";
  switch (choice)
  {
      case "D":
         cout << "D\n";
      case "L":
         cout << "L\n";
         break;
      default: 
         cout << "None\n";
  }
  return 0;

}

      </source>

Switch: falling-through behavior

<source lang="cpp">

1. include <iostream>

using namespace std; int main(void) {

  char grade;
  cout << "Enter your grade: ";
  cin >> grade;
  switch (grade)
  {
  case "a":case "A":
     cout << "Your average must be between 90 - 100" 
          << endl;
     break; 
  case "b":
  case "B":
     cout << "Your average must be between 80 - 89" 
          << endl;
     break;
  case "c":
  case "C":
     cout << "Your average must be between 70 - 79" 
          << endl;
     break;
  case "d":
  case "D":
     cout << "Your average must be between 60 - 69" 
          << endl;
     break;
  default: 
     cout << "Your average must be below 60" << endl;
  }

return 0; }

      </source>