Subject: XploRe: Learning Guide
See XploRe:

Quantlet: quant14
Description: Square root with error, if the argument is negative.
Download: quant14.xpl

Code:
  proc() = test(x)   ; defines a procedure

    error(x<0,"Negative argument!") 
                     ; displays an error box containing the 
                     ;    specified text and stops the program 
                     ;    in case x is negative

    sqrt(x)          ; computes the square root in case the
                     ;    preceding command did not lead to
                     ;    a break of the program
     
  endp               ; end of the procedure
;
  test(-4)           ; runs the procedure with value -4


Subject: XploRe: Learning Guide
See XploRe:

© MD*Tech - Method and Data Technologies, generated on 6.6.2000 .