toupper()

NAME

toupper(), _toupper() - lower case to upper case letter conversion

SYNOPSIS

#include <ctype.h>


int toupper (int c)
int _toupper (int c)

DESCRIPTION

The toupper(3) function converts a lower-case letter to the corresponding upper-case letter. If c is not a lower-case letter, it is not converted.

The _toupper(3) function does the same, but the argument c must be a lower-case letter. This routine is faster but will break with the wrong input.

RETURN VALUES

If the argument is a lower-case letter, the toupper(3) function returns the corresponding upper-case letter if there is one; otherwise the argument is returned unchanged.

SEE ALSO

isascii(3)

isalnum(3)

isalpha(3)

isblank(3)

iscntrl(3)

isdigit(3)

isgraph(3)

islower(3)

isprint(3)

ispunct(3)

isspace(3)

isupper(3)

isxdigit(3)

tolower(3)