mirror of
https://github.com/QB64-Phoenix-Edition/QB64pe.git
synced 2024-07-01 13:50:36 +00:00
aeb9c0668b
Note: Many files were removed (not yet existing/empty pages). The parser will try to download them on demand and will auto-generate text for missing pages (eg. most _gl pages).
51 lines
1.4 KiB
Plaintext
51 lines
1.4 KiB
Plaintext
{{QBDLDATE:05-20-2022}}
|
|
{{QBDLTIME:23:06:26}}
|
|
{{DISPLAYTITLE:_ASSERT}}
|
|
The [[_ASSERT]] statement can be used to perform tests in code that's in development, for debugging purposes.
|
|
|
|
|
|
{{PageSyntax}}
|
|
:[[_ASSERT]] {{Parameter|condition}}[, {{Parameter|errorMessage$}}]
|
|
|
|
|
|
{{PageDescription}}
|
|
* {{Parameter|condition}} is the condition that must be met in order to consider the _ASSERT valid.
|
|
* Optional {{Parameter|errorMessage$}} is the message to be displayed in the console window if [[$ASSERTS|$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'''.
|
|
|
|
|
|
{{PageExamples}}
|
|
''Example:'' Adding test checks for parameter inputs in a function.
|
|
{{CodeStart}}
|
|
{{Cl|$ASSERTS}}:CONSOLE
|
|
|
|
{{Cl|DO}}
|
|
a = {{Cl|INT}}({{Cl|RND}} * 10)
|
|
b$ = myFunc$(a)
|
|
{{Cl|PRINT}} a, , b$
|
|
{{Cl|_LIMIT}} 3
|
|
{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|_KEYHIT}}
|
|
|
|
{{Cl|FUNCTION}} myFunc$ (value {{Cl|AS}} {{Cl|SINGLE}})
|
|
{{Cl|_ASSERT}} value > 0, "Value cannot be zero"
|
|
{{Cl|_ASSERT}} value <= 10, "Value cannot exceed 10"
|
|
|
|
{{Cl|IF}} value > 1 {{Cl|THEN}} plural$ = "s"
|
|
myFunc$ = {{Cl|STRING$}}(value, "*") + {{Cl|STR$}}(value) + " star" + plural$ + " :-)"
|
|
{{Cl|END}} {{Cl|FUNCTION}}
|
|
{{CodeEnd}}
|
|
|
|
|
|
{{PageSeeAlso}}
|
|
* [[$ASSERTS]]
|
|
* [[$CHECKING]]
|
|
* [[Relational Operations]]
|
|
|
|
|
|
{{PageNavigation}}
|
|
|