tolower

Syntax

#include <ctype.h> int tolower(int c);

Description

This function returns c, converting it to lower case if it is upper case. See section toupper.

Return Value

The lower case letter.

Portability

ANSI/ISO C	C89; C99
POSIX	1003.2-1992; 1003.1-2001

Example

for (i=0; buf[i]; i++) buf[i] = tolower(buf[i]);