#include <stdio.h>

void copystr(char *, char * );

int main(void)
{
  char aa[]={"His name was John"}; // declare char array and initialize
  char bb[ sizeof(aa)  ];          // declare char array of equal size

  char * paa,pbb ; // declare char pointer

  paa=aa;    // initialize char pointer to &aa[], or aa common short hand.
  pbb=bb;    // initialize char pointer to &bb[], or bb common short hand.

  printf("Contents of array aa[]: %s\n", paa ); // print string starting at &aa[0]
  printf("Contents of array bb[]: %s\n", pbb ); // print string starting at &bb[0]

  printf("Calling function copystr.\n");

  copystr( paa, pbb) ; // copy contents of aa[] to bb[]

  printf("Contents of array bb[]: %s\n", pbb);

  return 0;
}

void copystr(char *str1, char *str2 )
{
  int ii;
  for( ii=0; *(str1+ii); ii++); // ii initialize to zero
                               // while thing-at position in array is not NULL
                               // do block
                               // increment position in array by 1
  {
     *(str2+ii)=*(str1+ii);
  }
  printf("Done copying array\n");
}