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Reference for Wiring version 1.0 Build 0100+ If you have a previous version, use the reference included with your software. If see any errors or have any comments, let us know.

Name |

### switch()

Examples |
    int num = 1;

    switch (num) {
      case 0:
        Serial.println("Zero"); // Does not execute
        break;
      case 1:
        Serial.println("One");  // Prints "One"
        break;
    }

    char letter = 'N';

    switch (letter) {
      case 'A':
        Serial.println("Alpha"); // Does not execute
        break;
      case 'B':
        Serial.println("Bravo"); // Does not execute
        break;
      default: // Default executes if the case labels
        Serial.println("None");  // don't match the switch parameter
        break;
    }

    // Removing a "break" enables testing
    // for more than one value at once

    char letter = 'b';

    switch (letter) {
      case 'a':
      case 'A':
        Serial.println("Alpha"); // Does not execute
        break;
      case 'b':
      case 'B':
        Serial.println("Bravo"); // Prints "Bravo"
        break;
    }

Description | Works like an if else structure, but switch() is more convenient when you need to select between three or more alternatives. Program controls jumps to the case with the same value as the expression. All remaining statements in the switch are executed unless redirected by a break. Only primitive datatypes which can convert to an integer (byte, char, and int) may be used as the expression parameter. The default is optional.
Syntax |
    switch (expression)
    {
      case label:
         statements
      case label:     // Optional
         statements   // Optional
      default:               // Optional
         statements   // Optional
    }
Parameters |

expression | byte, char, or int
label | byte, char, or int
statements | one or more statements to be executed

Usage | Application
Related | case default break if() else

Updated on July 07, 2011 11:09:12pm PDT