strlwr() function in C language


  • strlwr( ) function converts a given string into lowercase. Syntax for strlwr( ) function is given below.
char *strlwr(char *string);
  • strlwr( ) function is non standard function which may not available in standard library in C.

Example program for strlwr() function in C language:

    • In this program, string ”MODIFY This String To LOwer” is converted into lower case using strlwr( ) function and result is displayed as “modify this string to lower”.

Output:

modify this string to lower

Other String functions in C language:

    • String.h header file supports all the string functions in C language. All the string functions are given below.
S.no
String functions
Description
1strcat ( ) Concatenates str2 at the end of str1.
2strncat ( ) appends a portion of string to another
3strcpy ( ) Copies str2 into str1
4strncpy ( ) copies given number of characters of one string to another
5strlen ( ) gives the length of str1.
6strcmp ( ) Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2.
7strcmpi ( ) Same as strcmp() function. But, this function negotiates case.  “A” and “a” are treated as same.
8strchr ( ) Returns pointer to first occurrence of char in str1.
9strrchr ( ) last occurrence of given character in a string is found
10strstr ( ) Returns pointer to first occurrence of str2 in str1.
11strrstr ( ) Returns pointer to last occurrence of str2 in str1.
12strdup ( ) duplicates the string
13strlwr ( ) converts string to lowercase
14strupr ( ) converts string to uppercase
15strrev ( ) reverses the given string
16strset ( ) sets all character in a string to given character
17strnset ( ) It sets the portion of characters in a string to given character
18strtok ( ) tokenizing given string using delimiter
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