#include <ctype.h> int tolower(int c);
tolower
translates an uppercase character to the corresponding
lowercase character. The argument must either be a char
value or
EOF
. The mapping of uppercase to lowercase characters is
locale dependent.
tolower
is implemented by the compiler as a built-in function, unless
you use the name tolower
with #undef
.
#include <ctype.h> #include <stdio.h> #define MAX 40 main() { char *str, *ptr; char input[MAX]; puts("Enter a string of uppercase characters (maximum of 40):"); str = gets(input); ptr = str; /* Translate all uppercase characters in a string to */ /* lowercase characters. */ while (*str) { *str = tolower(*str); /* Increment outside of macro for maximum portability. */ str++; } printf("%sn", ptr); }
islower
, memlwr
, strlwr
, toupper
Copyright (c) 1998 SAS Institute Inc. Cary, NC, USA. All rights reserved.