Header File 

string.h, mbstring.h 

Category 

Conversion Routines, Memory and String Manipulation Routines 

Prototype 

char *strlwr(char *s); 

wchar_t *_wcslwr(wchar_t *s); 

unsigned char *_mbslwr(unsigned char *s); 

Description 

Converts uppercase letters in a string to lowercase. 

strlwr converts uppercase letters in string s to lowercase according to the current locale's LC_CTYPE category. For the C locale, the conversion is from uppercase letters (A to Z) to lowercase letters (a to z). No other characters are changed. 

Return Value 

strlwr returns a pointer to the string s. 

Example  

#include <stdio.h>
#include <string.h>
int main(void)
{
   char *string = "CodeGear";
   printf("string prior to strlwr: %s\n", string);
   strlwr(string);
   printf("string after strlwr:    %s\n", string);
   return 0;
}

Portability