[C] isalnum / isalnum.c / isalnum in c

2022. 7. 13. 00:36🧑🏻‍💻/C & C++

man isalnum

int isalnum(int c)
{
if ((c >= 0x30 && c <= 0x39) || (c >= 0x41 && c <= 0x5a)
|| (c >= 0x61 && c <= 0x7a))
return (c);
return (0);
}

 

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