Question

I am trying to tokenize a string using a function by passing the char string[] and char *pointer[100]. While I have working code inside the int main(), I am having trouble actually declaring the parameters for the function.

I know how to pass the char array (char string[]), but not how to pass the char pointer array (char *pointer[100]).

This is my code below:

int main() {

   // Declare variables
   char str[] = "this is a test only - just a test";       // char array
   char *ptr1[100], *ptr2[100];                           // Creates two pointers

   function1(str, *ptr1[100]);

   return 0;
}

void function1(char str[], char *ptr1[100]) {

   int i = 0;
       int count = 0;

       // Declaration of strtok: char *strtok(char *str, const char *delim)
       // It breaks *str into a series of tokens using *delim
       char *p = strtok (str, " ");

       // Stores each piece into the array
       while (p != NULL) {
           ptr1[i++] = p;
           p = strtok(NULL, " ");
           count++;
       }

       // Prints the array
       for (i = 0; i < count; ++i) {
           printf("%s\n", ptr1[i]);
       }
}

For my code, it works if I get rid of the function and simply place the code in my int main(). Other times, I manipulated the second parameter and it started to work. However, the return values from 'p' transformed into integers from the "ptr1[i++] = p" portion of the code.

Answer 1

If you have any doubts, please give me comment...

#include <stdio.h>

#include <string.h>

void function1(char str[], char *ptr1[100]);

int main()

{

    // Declare variables

    char str[] = "this is a test only - just a test"; // char array

    char *ptr1[100], *ptr2[100];                      // Creates two pointers

    function1(str, ptr1);

    return 0;

}

void function1(char str[], char *ptr1[100])

{

    int i = 0;

    int count = 0;

    // Declaration of strtok: char *strtok(char *str, const char *delim)

    // It breaks *str into a series of tokens using *delim

    char *p = strtok(str, " ");

    // Stores each piece into the array

    while (p != NULL)

    {

        ptr1[i++] = p;

        p = strtok(NULL, " ");

        count++;

    }

    // Prints the array

    for (i = 0; i < count; ++i)

    {

        printf("%s\n", ptr1[i]);

    }

}