Purpose 
Return one of a series of values based upon a TRUE/FALSE evaluation of a corresponding series of expressions. 
Syntax 
var = SWITCH(expr1, val1 [[, expr2, val2], ...]) var& = SWITCH&(expr1, val1& [[, expr2, val2&], ...]) var$ = SWITCH$(expr1, val1$ [[, expr2, val2$], ...]) 
Remarks 
SWITCH expects values of any
If expr1 evaluates TRUE, val1 is returned, if expr2 evaluates TRUE, val2 is returned, etc. Each control expression in the series is evaluated as a typical PowerBASIC Boolean expression, which offers shortcircuit expression evaluation as needed. To force a bitwise evaluation of an expression, enclose it in parentheses. The value parameters may be expressions, literals or variables of the appropriate data type for the SWITCH function in use. SWITCH returns the matching value parameter from the first TRUE evaluation of the control expressions, evaluated from left to right in the list. Therefore, it would be wise to place the most likely selections at the front of the SWITCH list to achieve the utmost efficiency. If no expressions evaluate to TRUE, then zero (0) is returned. 
Restrictions 
Contrary to the implementation in some other languages, only the chosen value (one of val1, val2, val3…) is evaluated at runtime; the other value parameters are not. This ensures optimum execution speed, as well as the elimination of unanticipated side effects. 
See also 

Example 
' SWITCH with simple expressions A$ = SWITCH$(x%=1, "Bob", x%=20, "Bruce", x% > 20, "Dan", x% < 1, "Nobody!")
' SWITCH with complex expressions FUNCTION z(i&) AS LONG INCR i& FUNCTION = i& END FUNCTION
FUNCTION PBMAIN x& = 1 Choice& = SWITCH&(z(x&), 1, z(x&), 2, z(x&), 3) ' Choice& will equal 2 END FUNCTION 