Passing pointers to functions

/* 1605.c: Passing pointers to functions */
#include <stdio.h>

void ChPrint(char *ch);
int DataAdd(int *list, int max);
main()
{
    char str[] = "It's a string!";
    char *ptr_str;
    int list[5] = {1, 2, 3, 4, 5};
    int *ptr_int;

    /* assign address to pointer */
    ptr_str = str;
    ChPrint(ptr_str);
    ChPrint(str);

    /* assign address to pointer */
    ptr_int = list;
    printf("The sum returned by DataAdd(): %d\n",DataAdd(ptr_int, 5));
    printf("The sum returned by DataAdd(): %d\n",DataAdd(list, 5));
return 0;
}
/* function definition */
void ChPrint(char *ch)
{
    printf("%s\n", ch);
}
/* function definition */
int DataAdd(int *list, int max)
{
    int i;
    int sum = 0;

    for (i=0; i<max; i++)
    sum += list[i];
    return sum;
}