Switch-Case Statement. What is a switch-case?  The switch-case statement is really nothing more than a glorified.

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Presentation transcript:

Switch-Case Statement

What is a switch-case?  The switch-case statement is really nothing more than a glorified nested if-else package.  C++ has taken on the headache of setting up the overhead of creating the structure of nested if- else for you.

switch-case Syntax switch (control_var) { case constant1: statement1 break; case constant2: statement2 break;... case constantN: statementN break; default: default_statement }

switch-case Syntax switch (control_var) { case constant1: statement1 break; case constant2: statement2 break;... case constantN: statementN break; default: default_statement }

switch-case Syntax switch (control_var) { case constant1: statement1 break; case constant2: statement2 break;... case constantN: statementN break; default: default_statement }

switch-case Syntax switch (control_var) { case constant1: statement1 break; case constant2: statement2 break;... case constantN: statementN break; default: default_statement }

switch-case Syntax switch (control_var) { case constant1: statement1 break; case constant2: statement2 break;... case constantN: statementN break; default: default_statement }

switch-case Syntax switch (control_var) { case constant1: statement1 break; case constant2: statement2 break;... case constantN: statementN break; default: default_statement }

switch-case Syntax switch (control_var) { case constant1: statement1 break; case constant2: statement2 break;... case constantN: statementN break; default: default_statement }

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; }

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; } user inputs: 2

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; }

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; }

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; }

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; }

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; }

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; }

short choice; cout > choice; switch (choice) { case 1: cout << “Oink”; break; case 2: cout << “Bark”; cout << “Ruffruff”; break; case 3: cout << “Moooo” << endl; break; }

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit ); user inputs: c

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit ); user inputs: 4

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

bool quit = false; char choice; do { cout > choice; switch (choice) { case ‘1’: case ‘p’: cout << “Oink”; break; case ‘2’: case ‘d’: cout << “Bark”; break; case ‘3’: case ‘c’: cout << “Moooo” << endl; break; case ‘4’: case ‘q’: quit = true; break; default: cout << “ERROR: Invalid input...” << endl; } } while ( !quit );

long student_number; short student_number_index; cout > student_number; student_number_index = student_number / 10000; switch (student_number_index) { case 12: // code to handle transfers break; case 13: // code to handle freshmen break; case 14: // code to handle sophomores break; case 35: // code to handle grads default: // Error condition }

End of Session