Difference between revisions of "TI-BASIC:Number Or String"
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|summary=Determines whether an input is a number or string. | |summary=Determines whether an input is a number or string. | ||
|input=''Ans'' - the number or string to examine | |input=''Ans'' - the number or string to examine | ||
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|compatibility= TI-83/84/+/SE | |compatibility= TI-83/84/+/SE | ||
|author=bfr | |author=bfr | ||
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|url=http://www.unitedti.org/forum/index.php?showtopic=9191 | |url=http://www.unitedti.org/forum/index.php?showtopic=9191 | ||
|download=http://tibasicdev.wikidot.com/local--files/routine-page/routine.zip routine.zip | |download=http://tibasicdev.wikidot.com/local--files/routine-page/routine.zip routine.zip | ||
Latest revision as of 22:12, 24 February 2016
Routine Summary
Determines whether an input is a number or string.
Inputs
Ans - the number or string to examine
Outputs
Ans - 1 if the input is a number, 0 if it is a string
Variables Used
A, B [,∟A, ∟B if input is a string]
Calculator Compatibility
TI-83/84/+/SE Author
bfrURL: [1] Download
:DelVar AFor(B,1,1 :Ans->A :Ans->B :A=B
If Ans is a string, it is stored to ∟A and ∟B. A remains 0, B remains 1, and A=B returns false. If Ans is a number, it is stored into both A and B, thus A=B returns true.
The For( command is used to avoid updating Ans. If this routine is used in a larger program and the input can be stored into a more permanent variable, For(B,1,1 can become 1->B. If this is not possible, the For( statement should have an End added.
