C++ Switch Test

Introduction

A simple note of C/C++ switch statement

Code

switch_test.cpp

#include <iostream>

using namespace std;

/** test switch statement
 * 
 * Note: the range part (e.g., 2 ... 35) is an extesion
 *       and may not work with each compiler
 */
void testSwitchNumber (int i);
void testSwitchChar (char ch);
int main() {
    // output: i == 1
    testSwitchNumber(1);
    // output: i between 2 and 35
    testSwitchNumber(2);
    // output: i between 2 and 35
    testSwitchNumber(35);
    // output: i == 40
    //         i is grater then 35
    testSwitchNumber(40);
    cout << endl;

    // output: ch == 'a'
    testSwitchChar('a');
    // output: ch between 'b' and 'z'
    testSwitchChar('c');
    // output: ch between 'A' and 'Z'
    testSwitchChar('C');
    // output: ch is not an alphabet
    testSwitchChar('2');
    cout << endl;

    system("PAUSE");
    return 0;
}

void testSwitchNumber (int i) {
    // Note: the range part (e.g., 2 ... 35) is an extesion
    //       and may not work with each compiler
    switch (i) {
        case 1: // a specific value
            cout << "i == 1" << endl;
            break;
        case 2 ... 35: // a range
            cout << "i between 2 and 35" << endl;
            break;
        case 40: // no break, will continue to try cases below
            cout << "i == 40" << endl;
        default:
            cout << "i is grater then 35" << endl;
    }
}
void testSwitchChar (char ch) {
    // Note: the range part (e.g., 'b' ... 'z') is an extesion
    //       and may not work with each compiler
    switch (ch) {
        case 'a': // a specific char
            cout << "ch == 'a'" << endl;
            break;
        case 'b' ... 'z': // a range
            cout << "ch between 'b' and 'z'" << endl;
            break;
        case 'A' ... 'Z':
            cout << "ch between 'A' and 'Z'" << endl;
            break;
        default:
            cout << "ch is not an alphabet" << endl;
    }
}

Result

Reference

http://www.cplusplus.com/doc/tutorial/control/

http://bytes.com/topic/c/answers/532414-switch-case-range

Download

https://github.com/benbai123/C_Cplusplus_Practice/blob/master/CPP/CPP_Basic/switch_test.cpp