Using the malloc function

/* 1701.c: Using the malloc function */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
/* function declaration */
void StrCopy(char *str1, char *str2);
/* main() function */
main()
{
    char str[] = "Use malloc() to allocate memory.";
    char *ptr_str;
    int result;
    /* call malloc() */
    ptr_str = malloc( strlen(str) + 1);
    if (ptr_str != NULL){
        StrCopy(str, ptr_str);
        printf("The string pointed to by ptr_str is:\n%s\n",ptr_str);
        result = 0;
    }
    else{
        printf("malloc() function failed.\n");
        result = 1;
    }
    return result;
}
/* function definition */
void StrCopy(char *str1, char *str2)
{
    int i;

    for (i=0; str1[i]; i++)
    str2[i] = str1[i];
    str2[i] = '\0';
}