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49 lines
1.4 KiB
Plaintext
49 lines
1.4 KiB
Plaintext
{{DISPLAYTITLE:_ASSERT}}
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The [[_ASSERT]] statement can be used to perform tests in code that's in development, for debugging purposes.
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{{PageSyntax}}
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:[[_ASSERT]] {{Parameter|condition}}[, {{Parameter|errorMessage$}}]
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{{PageDescription}}
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* {{Parameter|condition}} is the condition that must be met in order to consider the _ASSERT valid.
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* Optional {{Parameter|errorMessage$}} is the message to be displayed in the console window if [[$ASSERTS|$ASSERTS:CONSOLE]] is used.
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* If the condition is not met (that is, if it evaluates to 0), an error occurs ("_ASSERT failed on line #") and program execution stops.
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==Availability==
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* '''Version 1.4 and up'''.
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{{PageExamples}}
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''Example:'' Adding test checks for parameter inputs in a function.
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{{CodeStart}}
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{{Cl|$ASSERTS}}:CONSOLE
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{{Cl|DO}}
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a = {{Cl|INT}}({{Cl|RND}} * 10)
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b$ = myFunc$(a)
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{{Cl|PRINT}} a, , b$
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{{Cl|_LIMIT}} 3
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{{Cl|LOOP}} {{Cl|UNTIL}} {{Cl|_KEYHIT}}
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{{Cl|FUNCTION}} myFunc$ (value {{Cl|AS}} {{Cl|SINGLE}})
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{{Cl|_ASSERT}} value > 0, "Value cannot be zero"
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{{Cl|_ASSERT}} value <= 10, "Value cannot exceed 10"
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{{Cl|IF}} value > 1 {{Cl|THEN}} plural$ = "s"
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myFunc$ = {{Cl|STRING$}}(value, "*") + {{Cl|STR$}}(value) + " star" + plural$ + " :-)"
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{{Cl|END}} {{Cl|FUNCTION}}
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{{CodeEnd}}
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{{PageSeeAlso}}
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* [[$ASSERTS]]
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* [[$CHECKING]]
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* [[Relational Operations]]
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{{PageNavigation}}
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