strlen() function in C Language


  • strlen( ) function in C gives the length of the given string. Syntax for strlen( ) function is given below.
size_t strlen ( const char * str );
  • strlen( ) function counts the number of characters in a given string and returns the integer value.
  • It stops counting the character when null character is found. Because, null character indicates the end of the string in C.

Example program for strlen() function in C language:

  • In below example program, length of the string “fresh2refres.com” is determined by strlen( ) function as below. Length of this string 17 is displayed as output.

Output:

string length = 17

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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