void strcpy(dest, src)		/*copy src to dest*/
char *dest;
const char *src;
  {
  while((*dest++ = *src++) != '\0')
    ;
  }

/*MORE CONCISE AND EQUALLY CORRECT, BUT A LITTLE MISLEADING:*/
void strcpy(dest, src)		/*copy src to dest*/
char *dest;
const char *src;
  {
  while(*dest++ = *src++)
    ;
  }

void strcat(left, right)	/*append the string right to the string left*/
char *left;
const char *right;
  {
  while(*left != '\0')
    left++; /*why will this not work if the increment happens in the guard?*/
  while((*left++ = *right++) != '\0')
    ;
  }

int strcmp(s, t)		/*return <0 if s<t, 0 if s=t, >0 if s>t*/
const char *s, *t;
  {
  while((*s == *t) && (*s != '\0'))
    s++, t++;
  return(*s - *t);
  }

int strlen(s)			/*length of the string s*/
const char *s;
  {
  register int i=0;
  while(s[i] != '\0')
    i++;
  return(i);
  }

/*UNDER WHAT CIRCUMSTANCES WILL THIS PROGRAM NOT WORK?*/
int main()
  {
  char fortune[500];
  printf("Type your fortune: ");	/*print a fortune with "in bed" added*/
  scanf("%s", fortune);
  strcat(fortune, " in bed");
  printf("It reads better like this:\n");
  printf(fortune);
  printf("\n");
  return 0;
  }

/*HERE'S ONE FIX, BUT UNDER WHAT CIRCUMSTANCES WILL IT STILL NOT WORK?*/
int main()
  {
  char fortune[500];
  printf("Type your fortune: ");
  scanf("%s", fortune);
  strcat(fortune, " in bed");
  printf("It reads better like this:\n");
  printf("%s\n", fortune);
  return 0;
  }