#include <stdlib.h> /* defines NULL, but can also just use # define NULL 0 */

main()
{char str[80];
 char *str2, *strsave();  
            /* need to declare functions that return non-ints.
	       if main is last, no declarations needed.  
	       no arguments included in declaration. */
 printf("Enter a string> ");
 scanf("%s",str); /* notice no & for ptrs, & for non-ptr values */
 str2=strsave(str);
 printf ("\n%s has a length of %d\nstr2 is %s\n",str,strlength(str), str2);
}


/* these examples modified for K&R, chapter 5 */

/* remember functions are int by default */
/* the following header in K&R is written slightly differently.
   Either is ok, but the text uses a slightly older style of C.
   It has the following:
 strlength(s)
     char * s;
     where  the parameter type is declared below the parameter list  */

/* finally, strlen is built in, so there is really no need for this function*/

strlength(char *s) 
{
char *p = s;
while (*p != '\0')
   p++;
 return (p-s);
}   


/* this version of strsave may be helpful for your assignment.  */
char *strsave(s)
     char *s;   /* notice type is BELOW header; this is common in C */
{char *p;
 if ((p = (char *) malloc(strlength(s)+1)) != NULL)
     strcpy(p, s);
 return p;
}