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TOUPPER(3) BSD Library Functions Manual TOUPPER(3) NAME toupper -- lower case to upper case letter conversion LIBRARY Standard C Library (libc, -lc) SYNOPSIS #include <ctype.h> int toupper(int c); DESCRIPTION The toupper() function converts a lower-case letter to the corresponding upper-case letter. The argument must be representable as an unsigned char or the value of EOF. RETURN VALUES If the argument is a lower-case letter, the toupper() function returns the corresponding upper-case letter if there is one; otherwise, the argu- ment is returned unchanged. COMPATIBILITY The 4.4BSD extension of accepting arguments outside of the range of the unsigned char type in locales with large character sets is considered ob- solete and may not be supported in future releases. The towupper() func- tion should be used instead. SEE ALSO ctype(3), isupper(3), towupper(3) STANDARDS The toupper() function conforms to ISO/IEC 9899:1990 ("ISO C90"). BSD July 25, 2010 BSD
NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUES | COMPATIBILITY | SEE ALSO | STANDARDS
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