isalpha - Test for letter

Definition	#include <ctype.h> int isalpha(int c); isalpha checks whether the character c is a letter (A-Z, a-z).
Return val.	!= 0 0	c is a letter. c is not a letter.
Note	isalpha is implemented both as a macro and as a function (see section “Functions and macros”).
Example	#include <ctype.h> #include <stdio.h> int main(void) { int c; while((c = getchar()) != EOF)     printf("%s : %c\n", ((isalpha(c)) ? "Letter" : "Other"), c); return 0; }
See also	isalnum, isascii, iscntrl, isdigit, isgraph, islower, ispunct, isprint, isspace, isupper, isxdigit, isebcdic, iswalpha