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C LIBRARY FUNCTIONS->Detailed Descriptions->isalpha()
|int isalpha(int c);||Test for letter ('A'-'Z' or 'a'-'z')|
c Integer to be tested
This function tests the integer passed to it to see if it is a letter:
'A'-'Z' or 'a'-'z'.
The ASCII character set is assumed.
TRUE (1) is returned if the character is a letter, otherwise FALSE (0) is returned.