Switch statement

Use the switch statement to pass control to a case which matches the result of the switch_expression. If no case satisfies the condition, the default case is executed.

syntax:

(switch (switch_expression)
        (case (number)
                code_block_2
        )
        .
        .
        .
        (default
                code_block_3
        )
)

Example using the switch statement - prints “01.....7....C........” to the screen:

(for (= i 0) (< i 20) (++i)
        (switch (i)
                (case 0
                        Display("0" dsCOLOR clLIME)
                )
                (case 1
                        Display("1" dsCOLOR clBLUE)
                )
                (case 7
                        Display("7" dsCOLOR clYELLOW)
                )
                (case 12
                        Display("C" dsCOLOR clCYAN)
                )
                (default
                        Display("." dsCOLOR clWHITE)
                )
        )
)

Switch statements can also be evaluated as expressions:

// Set direction based on the key pressed.
(= direction
        (switch (pEvent:message))
                (case KEY_W
                        UP
                )
                (case KEY_S
                        DOWN
                )
                (case KEY_D
                        RIGHT
                )
                (case KEY_A
                        LEFT
                )
                (default
                        CENTER
                )
        )
)