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toupper() -- ctype Function (libc) Convert characters to upper case #include <ctype.h> int toupper(c) int c; toupper() converts the letter c to upper case and returns the converted character. If c is not an lower-case character, that is, any character for which islower() returns true, toupper() returns it unchanged. Example For an example of this routine, see the entry for tolower(). See Also _toupper(), libc, tolower() ANSI Standard, §7.3.2.2 POSIX Standard, §8.1