progress-4gl Functions Simple function
Example
/* This function returns TRUE if input is the letter "b" and false otherwise */
FUNCTION isTheLetterB RETURNS LOGICAL (INPUT pcString AS CHARACTER):
IF pcString = "B" THEN
RETURN TRUE.
ELSE
RETURN FALSE.
END FUNCTION.
/* Calling the function with "b" as input - TRUE expected */
DISPLAY isTheLetterB("b").
/* Calling the function with "r" as input - FALSE expected */
DISPLAY isTheLetterB("r").
Parts of the syntax is actually not required:
/* RETURNS isn't required, INPUT isn't required on INPUT-parameters */
FUNCTION isTheLetterB LOGICAL (pcString AS CHARACTER):
IF pcString = "B" THEN
RETURN TRUE.
ELSE
RETURN FALSE.
/* END FUNCTION can be replaced with END */
END.
