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Having problems with malloc

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I'm using the book 'Teach Yourself C in 24 Hours' and in the chapter about allocating memory, I keep getting the error "cannot convert 'void *' to 'char *' in function main()". Here's the code from the book:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

void str_copy(char *str1, char *str2);

   char str[] = "Allocating memory.";
   char *p_str; // pointer to string
   int result;

   p_str = malloc(strlen(str) + 1); // right here is where I get the error //
   if(p_str != NULL)
      str_copy(str, p_str);
      printf("The string pointed to by p_str is: \n%s\n", p_str);
   result = 0;
      printf("malloc() function failed.\n");
      result = 1;
   return result;

void str_copy(char *str1, char *str2)
   int i;
   for(i=0; str1; i++) // there's supposed to be braces around an i after the str1, but for some reason, they aren't showing up in this post //
      str2[i] = str1[i];
   str2[i] = '\0';
It's really bugging me because I'm entering everything just as it is in the book, so I know it's not my fault, or, at least it doesn't seem to be, but I can't figure out what the problem is. Thanks to anyone who can help. [edited by - locus on September 15, 2002 2:36:13 AM]

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Are you trying to compile it with a c++ compiler? While the code is valid c, it isn''t valid c++. Try this:

p_str = (char*)malloc(strlen(str) + 1);

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