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#include <ctype.h>int isxdigit(int ch);
The isxdigit( ) function returns nonzero if ch is a hexadecimal digit; otherwise, zero is returned. A hexadecimal digit will be in one of these ranges: A–F, a–f, or 0–9.
Related functions are isalnum( ), isalpha( ), iscntrl( ), isdigit( ), isgraph( ), ispunct( ), and isspace( ).
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