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isalnum | Function (Macro) |
ctype.h |
short isalnum (short c); |
Checks whether a character is an alphanumeric.
isalnum returns nonzero if c is a letter ('A' to 'Z' or 'a' to 'z') or a digit ('0' to '9'), otherwise it returns zero. It is an inline function which is implemented using GNU C smart macros, which expands to a medium-sized code.