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The isalpha function in C is part of the C Standard Library and is defined in <ctype.h>. It checks whether a given character is an alphabetic letter (either uppercase or lowercase). The function returns a nonzero value (true) if the character is a letter (A-Z or a-z) and 0 (false) otherwise.
Syntax:
c
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#include <ctype.h>
int isalpha(int ch);
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- https://docs.vultr.com/clang/standard-library/ctyp
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