Isalpha - Texas Instruments TI-89 Developer's Manual

1276

isalpha

Declaration: BYTE isalpha (BYTE c )
Category(ies): Character Classification / Conversion
Description: Return non-zero (true) if the given character is alphabetic (A . . . Z, and all
of the international alphabetic characters).
c
Inputs:
Non-zero if c is alphabetic, zero otherwise.
Outputs:
Assumptions: Access_AMS_Global_Variables is defined.
Side Effects: None
AMS 2.00 or above.
Availability:
TI-89 / TI-92 Plus
Differences: None
See Also: isalnum
Example: This example function converts a symbol name into tokenized format and
stores it in TokName. IT DOES NOT HANDLE RESERVED NAMES!
TokName must point to a buffer of MAX_SYM_LEN bytes, the tokenized
named is stored there starting at the end of the buffer.
BYTE *StrToTokN( BYTE *StrSymName, BYTE *TokName )
{ Access_AMS_Global_Variables;
BYTE c, *TokPtr = TokName+MAX_SYM_LEN;
c = tolower(*StrSymName);
if ((*StrSymName+1) == '\0' && isalpha(c) && isascii(c))
*TokPtr = ENCODE_LETTER(*StrSymName);
else {
TokPtr -= (short) (strlen((char *) StrSymName) + 2);
*TokPtr++= '\0';
strcpy( (char *) TokPtr, (char *) StrSymName );
}
return TokName + (MAX_SYM_LEN - 1);
}
TI-89 / TI-92 Plus Developer Guide
Appendix C: Macros — Character Classification / Conversion
— Character to test.
Not for Distribution Beta Version January 26, 2001