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arduino:control_structures:switchcase

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arduino:control_structures:switchcase [2013/02/15 20:45] (current)
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 +======switch / case statements   ======
 +
 +Like **if** statements, **switch...case** controls the flow of programs by allowing programmers to specify different code that should be executed in various conditions.  In particular, a switch statement compares the value of a variable to the values specified in case statements.  When a case statement is found whose value matches that of the variable, the code in that case statement is run.  
 +
 +The **break** keyword exits the switch statement, and is typically used at the end of each case.  Without a break statement, the switch statement will continue executing the following expressions ("falling-through") until a break, or the end of the switch statement is reached.
 +
 +
 +===== Example   =====
 +<code arduino>
 +  switch (var) {
 +    case 1:
 +      //do something when var equals 1
 +      break;
 +    case 2:
 +      //do something when var equals 2
 +      break;
 +    default: 
 +      // if nothing else matches, do the default
 +      // default is optional
 +  }
 +</code>
 +
 +===== Syntax   =====
 +
 +<code arduino>
 +switch (var) {
 +  case label:
 +    // statements
 +    break;
 +  case label:
 +    // statements
 +    break;
 +  default: 
 +    // statements
 +}
 +</code>
 +
 +===== Parameters   =====
 +
 +var: the variable whose value to compare to the various cases
 +
 +label: a value to compare the variable to
 +
 +====See also:   ====
 +[[arduino:control structures:Else | if...else]]
 +
 +Source: arduino.cc
  
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arduino/control_structures/switchcase.txt · Last modified: 2013/02/15 20:45 (external edit)

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