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- strtok( ) function in C tokenizes/parses the given string using delimiter. Syntax for strtok( ) function is given below.
char * strtok ( char * str, const char * delimiters );
……
Example program for strtok() function in C:
- In this program, input string “Test,string1,Test,string2:Test:string3” is parsed using strtok() function. Delimiter comma (,) is used to separate each sub strings from input string.
#include <stdio.h> #include <string.h> int main () { char string[50] ="Test,string1,Test,string2:Test:string3"; char *p; printf ("String "%s" is split into tokens:n",string); p = strtok (string,",:"); while (p!= NULL) { printf ("%sn",p); p = strtok (NULL, ",:"); } return 0; }
Output:
String “Test,string1,Test,string2:Test:string3” is split into tokens:
Test string1 Test string2 Test string3 |
Other C String functions:
- String.h header file supports all the string functions in C language. All the string functions are given below.
- Click on each string function name below to display example programs.
S.no |
String functions
|
Description
|
1 | strcat ( ) | Concatenates str2 at the end of str1. |
2 | strncat ( ) | appends a portion of string to another |
3 | strcpy ( ) | Copies str2 into str1 |
4 | strncpy ( ) | copies given number of characters of one string to another |
5 | strlen ( ) | gives the length of str1. |
6 | strcmp ( ) | Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2. |
7 | strcmpi ( ) | Same as strcmp() function. But, this function negotiates case. “A” and “a” are treated as same. |
8 | strchr ( ) | Returns pointer to first occurrence of char in str1. |
9 | strrchr ( ) | last occurrence of given character in a string is found |
10 | strstr ( ) | Returns pointer to first occurrence of str2 in str1. |
11 | strrstr ( ) | Returns pointer to last occurrence of str2 in str1. |
12 | strdup ( ) | duplicates the string |
13 | strlwr ( ) | converts string to lowercase |
14 | strupr ( ) | converts string to uppercase |
15 | strrev ( ) | reverses the given string |
16 | strset ( ) | sets all character in a string to given character |
17 | strnset ( ) | It sets the portion of characters in a string to given character |
18 | strtok ( ) | tokenizing given string using delimiter |
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