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strtok() function in C:
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.
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#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 ("%s\n",p); p = strtok (NULL, ",:"); } return 0; } |
Output:
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String “Test,string1,Test,string2:Test:string3” is split into tokens:
Test string1 Test string2 Test string3 |
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 for detail description and example programs.
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String functions
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Description
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| strcat ( ) | Concatenates str2 at the end of str1 |
| strncat ( ) | Appends a portion of string to another |
| strcpy ( ) | Copies str2 into str1 |
| strncpy ( ) | Copies given number of characters of one string to another |
| strlen ( ) | Gives the length of str1 |
| strcmp ( ) | Returns 0 if str1 is same as str2. Returns <0 if strl < str2. Returns >0 if str1 > str2 |
| strcmpi ( ) | Same as strcmp() function. But, this function negotiates case. “A” and “a” are treated as same. |
| strchr ( ) | Returns pointer to first occurrence of char in str1 |
| strrchr ( ) | last occurrence of given character in a string is found |
| strstr ( ) | Returns pointer to first occurrence of str2 in str1 |
| strrstr ( ) | Returns pointer to last occurrence of str2 in str1 |
| strdup ( ) | Duplicates the string |
| strlwr ( ) | Converts string to lowercase |
| strupr ( ) | Converts string to uppercase |
| strrev ( ) | Reverses the given string |
| strset ( ) | Sets all character in a string to given character |
| strnset ( ) | It sets the portion of characters in a string to given character |
| strtok ( ) | Tokenizing given string using delimiter |