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#include <ctype.h>int isalpha(int ch);
The isalpha( ) function returns nonzero if ch is a letter of the alphabet; otherwise, zero is returned. What constitutes a letter of the alphabet may vary from language to language. For English, these are the uppercase and lowercase letters A through Z.
Related functions are isalnum( ), iscntrl( ), isdigit( ), isgraph( ), isprint( ), ispunct( ), and isspace( ).
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