Thursday, December 3, 2020

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strtok Fucntion in c with example Program for strtok

  •  strtok function in c programming will help you to give the token of given input.
  • This kind of function (strtok in c ) is very useful which reduce the length of c program.
strtok in c


Use of the strtok function in c

strtok is an inbuilt function which is part of the <string.h> c header file.

Let's see first : - 

#include <string.h>
char* strtok(char* str, const char* delim);
  • This function take an input str and also a delimiter character delim.
  • Then strtok() in c split the input string into the tokens which is based on the delimited character.

Return Value of strtok in c

  • This function return a single string.
  • strtok() in c call this function continuously until we get NULL input sting.

Example for strtok in c

#include <stdio.h>
#include <string.h>
int main() {
    // Our input string
    char input_string[] = "Hello from function in c!";
    // Our output token list
    char token_list[20][20]; 
    // We call strtok(input, delim) to get our first token
    // Notice the double quotes on delim! It is still a char* single character string!
    char* token = strtok(input_string, " ");
    int num_tokens = 0; // Index to token list. We will append to the list
    while (token != NULL) {
        // Keep getting tokens until we receive NULL from strtok()
        strcpy(token_list[num_tokens], token); // Copy to token list
        token = strtok(NULL, " "); // Get the next token. Notice that input=NULL now!
    // Print the list of tokens
    printf("Token List:\n");
    for (int i=0; i < num_tokens; i++) {
        printf("%s\n", token_list[i]);
    return 0;

We use the strtok(NULL, " ") function in c and use the loop for until the get NULL.

Output strtok in c

Token List:


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