TI-BASIC:Number Or String
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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
bfrAuthors
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: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.
