Syntax

CASE expression OF

    expression: statement

    ...

    expression: statement

[ ELSE: statement ]

ENDCASE

Examples

This example illustrates how the CASE statement, unlike SWITCH, executes only the one statement that matches the case expression:

x=2 
CASE x OF 
  

 1: PRINT, 'one' 
  

 2: PRINT, 'two' 
   

 3: PRINT, 'three' 
   

 4: PRINT, 'four' 


ENDCASE 

IDL Prints:

two

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

但是对于每个case中不止一句的话，

需要加上begin 和 end

x=2 
CASE x OF 
  

 1: begin  

  PRINT, 'one'

  y=x

  print, y

  end   

 2: PRINT, 'two' 
   

 3: PRINT, 'three' 
   

 4: PRINT, 'four' 


ENDCASE