_tolower() — Translate uppercase characters to lowercase
Standards
Standards / Extensions | C or C++ | Dependencies |
---|---|---|
XPG4 |
both |
Format
#define _XOPEN_SOURCE
#include <ctype.h>
int _tolower(int c);
General description
The _tolower() macro is equivalent to tolower(c) except that the argument c must be an uppercase letter.
Returned value
_tolower() returns the lowercase letter corresponding to the argument passed.