ctype.h

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int isalnum(int c);



int isalpha(int c);



int iscntrl(int c);



int isdigit(int c);



int isgraph(int c);



int islower(int c);



int isprint(int c);




int ispunct(int c);



int isspace(int c);



int isupper(int c);




int isxdigit(int c);



int tolower(int c);




int toupper(int c);