/*
 * Copyright 2026 Naomi Alterman
 * Ask user for a word and print it forwards and backwards.
 * CSE 333 demo (for debugging)
 */

#define MAX_STR 100   /* length of longest input string */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

/* Return a new string with the contents of s backwards */
char* Reverse(char* s) {
  char* result = NULL;            /* the reversed string */
  int left_i, right_i;
  char ch;

  /* copy original string then reverse and return the copy */
  strcpy(result, s);

  left_i = 0;
  right_i = strlen(result);
  while (left_i < right_i) {
    ch = result[left_i];
    result[left_i] = result[right_i];
    result[right_i] = ch;
    ++left_i; --right_i;
  }

  return result;
}


/* Ask the user for a string, then print it forwards and backwards.     */
int main() {
  char line[MAX_STR];    /* original input line */
  char* rev_line;       /* backwards copy from reverse function */

  printf("Please enter a string: ");
  fgets(line, MAX_STR, stdin);
  rev_line = Reverse(line);
  printf("The original string was:   >%s<\n", line);
  printf("Backwards, that string is: >%s<\n", rev_line);
  printf("Thank you for trying our program.\n");
  return EXIT_SUCCESS;
}