/*
 * Ask user for a word and print it forwards and backwards.
 * CSE 374 demo (for debugging), 10/08-1/17.  HP
 */

#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 = (char*)malloc(strlen(s) + 1);
  int L, R;
  //char ch;

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

  L = 0;
  R = strlen(s)-1;
  for (; L < strlen(s); L++) {
    result[L] = s[R];
    R--; 
  }
  result[L] = '\0';

  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);
  line[strlen(line)-1] = '\0';
  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 0;
}