C – strtok() function

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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

Continue on C – Pointer…

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