starting at i is returned. tolower( s ) Returns a copy of s with all upper ... extensions are: New functions: toupper() and tolower(). New variables: ENVIRON[] and CONVFMT. ANSI C …omitted, use the rest of s . tolower( str ) Return a copy of the stringomitted, use the rest of s . tolower( str ) Return a copy of the stringomitted, use the rest of s . tolower( str ) Return a copy of the string