====== CASE ======
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Starts a block of commands to execute if a variable has one of multiple values — or starts a multiple-choices decision structure itself 

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**Implemented by:** [[:basics:ANSI:ansifull]], [[:basics:bwbasic:]], [[:basics:bwbasic:bw32]], [[:basics:msqb:QBasic]], [[:basics:VBDOS:]], [[:basics:FreeBASIC:]], [[:basics:Gambas:]], [[:basics:EndBASIC:]]

**With variations:** 

**Also written as: ** 

===== Usage =====
/* For inline examples of syntax, write the keyword between '' and '' (two single quotes) */

Multiple CASEs are usually part of a [[SELECT_CASE|SELECT-CASE]] branching structure. See the page for examples.

==== Variations ====

Modern versions of BBC BASIC replace the traditional SELECT-CASE structure with a SQL-like structure where the CASE keyword names the whole structure, such as the following example [[https://www.bbcbasic.co.uk/bbcwin/tutorial/chapter10.html|taken from //"An Introduction to Programming BBC BASIC"//]]:

<code>
CASE Choice% OF
  WHEN 1: PRINT "You chose option 1"
  WHEN 2: PRINT "You chose option 2"
  WHEN 3: PRINT "You chose option 3"
ENDCASE
</code>


===== Examples =====
/*
  Below is an example of a code block, using GeSHi syntax highlighting for //gwbasic//. Other styles of interest might be
  //basic4gl//, //blitzbasic//, //freebasic//, //gambas//, //locobasic//, //purebasic//, //qbasic//, //sdlbasic//,
  //thinbasic//, //vb//, //vbnet//, //xbasic// or //zxbasic//. 

  <code gwbasic>
  10 PRINT "HELLO"
  </code>
*/



===== Comments =====
/* Origin of the keyword, opinions, history... */


===== Related keywords =====
/* Keywords that are often or always used along this one */
  * [[SELECT_CASE|SELECT CASE]]
  * [[ENDCASE]]
  * [[WHEN]]
  * [[OTHERWISE]]

===== Similar keywords =====
/* Keywords with the same or similar functionality found in other versions of BASIC */

  * [[IF]], [[THEN]], [[ELSE]]
===== In other languages... =====
/* For parallels and comparisons with other modern-day languages */
Tcl, C and C-derived languages such as JavaScript and Java provide the equivalent //switch-case// structure.

===== References =====
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{{tag>Statements Branching Decision "Program Flow"}}