Pointer Problems

I am trying to implement bubble sort for a class assignment. They are trying to teach us how to use pointers. The only problem is it is an online course and I don't quite get the pointer thing. I'm having trouble with the swap function and getting it the right pointer level to be passed. Please help!

Code:

#include <stdio.h>
#include <string.h>
#define SIZE 10

void bubbleSort(char * const array[], const int size);

int main()
{
        char *a[SIZE] = {"Mahmuda", "Tim", "Andrew", "Jacob", "Vasant", "Kenneth", "Kendall", "John", "Vijayakumar", "Marion"};

        int i;

        printf("Data items in original order\n");

        //loop through array a
        for(i = 0; i < SIZE; i++)
        {
                printf("%s ", *(a + i));
        }

        printf("\nData items in ascending order\n");

        bubbleSort(a, SIZE);

        for(i = 0; i < SIZE; i++)
        {
                printf("%s ", *(a + i));
        }
        printf("\n");
        return 0;
}

void bubbleSort(char * const array[], const int size)
{
        void swap(char **ptrElement1, char **ptrElement2);
        int stringGreaterThan(char string1[], char string2[]);
        int pass;
        int j;

        for(pass = 0; pass < size - 1; pass++)
        {
                for(j = 0; j < size - 1; j++)
                {

                        if(strcmp(*(array + j), *(array + j + 1)) > 0)
                        {
                                swap(*(array + j), *(array + j + 1));
                        }
                }
        }
}

void swap(char **ptrElement1, char **ptrElement2)
{
      int hold = *ptrElement1;
      *ptrElement1 = *ptrElement2;
      *ptrElement2 = hold;
}

Pretty close

Code:

void bubbleSort(char * const array[], const int size)
{
        void swap(char **ptrElement1, char **ptrElement2);
        int stringGreaterThan(char string1[], char string2[]);
        int pass;
        int j;

        for(pass = 0; pass < size - 1; pass++)
        {
                for(j = 0; j < size - 1; j++)
                {

                        if(strcmp(*(array + j), *(array + j + 1)) > 0)
                        {
                                /* dropped a * from these */
                                swap((array + j), (array + j + 1));
                        }
                }
        }
}

void swap(char **ptrElement1, char **ptrElement2)
{
      /* fixed the type */
      /*int hold*/ char *hold = *ptrElement1;
      *ptrElement1 = *ptrElement2;
      *ptrElement2 = hold;
}


$ gcc -W -Wall -ansi -pedantic -O2 foo.c
foo.c: In function `bubbleSort':
foo.c:47: warning: passing arg 1 of `swap' discards qualifiers from pointer target type
foo.c:47: warning: passing arg 2 of `swap' discards qualifiers from pointer target type

$ ./a.exe
Data items in original order
Mahmuda Tim Andrew Jacob Vasant Kenneth Kendall John Vijayakumar Marion
Data items in ascending order
Andrew Jacob John Kendall Kenneth Mahmuda Marion Tim Vasant Vijayakumar

You might want to reconsider your use of 'const'.

Thank you for your help. I appreciate it.