_ASSERT

The _ASSERT statement can be used to perform tests in code that's in development, for debugging purposes.

Syntax

_ASSERT condition[, errorMessage$]

Description

• condition is the condition that must be met in order to consider the _ASSERT valid.
• Optional errorMessage$ is the message to be displayed in the console window if $ASSERTS:CONSOLE is used.
• If the condition is not met (that is, if it evaluates to 0), an error occurs ("_ASSERT failed on line #") and program execution stops.

Availability

• Version 1.4 and up.

Examples

Example: 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 END 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

• $ASSERTS
• $CHECKING
• Relational Operations

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