QB64-website/wiki/$ASSERTS.md

The $ASSERTS metacommand enables debug tests with the _ASSERT macro.

Syntax

$ASSERTS

$ASSERTS:CONSOLE

Description

• If an error message is passed to the _ASSERT statement, it is displayed in the console window if $ASSERTS:CONSOLE is used.

Availability

• Version 1.4 and up.

Example(s)

Adding test checks for parameter inputs in a function.

$ASSERTS:CONSOLE

DO
    a = INT(RND * 10)
    b$ = myFunc$(a)
    PRINT a, , b$
    _LIMIT 3
LOOP UNTIL _KEYHIT

FUNCTION myFunc$ (value AS SINGLE)
    _ASSERT value > 0, "Value cannot be zero"
    _ASSERT value <= 10, "Value cannot exceed 10"

    IF value > 1 THEN plural$ = "s"
    myFunc$ = STRING$(value, "*") + STR$(value) + " star" + plural$ + " :-)"
END FUNCTION

See Also

• _ASSERT
• $CHECKING
• Relational Operations