/* copy a string, using pointer increments */

#include <stdio.h>
 
/* declare global variables here -- generally to be avoided */

   char* hello = "Hello World\n";
/* char hello[] = ...   would prevent the hello++, 
			and we could rely on hello as a constant address */

int main ()
{  /* declare local variables here */

    char  again[30];
    char* copy=again;
    char letter;
    while (*copy++=*hello++);	/* note empty loop body*/
    again[5] ='-';		/* modify the copy */
       printf (again);
       
    return 0;    /* 0 tells operating system "Normal termination" */
}   /* end main */