prog/c/reverse_string.c

/*
**
** Copyright @ 2020 Joshua Branson <jbranso@member.fsf.org>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 3 of the License, or (at
** your option) any later version.
**
** It is distributed in the hope that it will be useful, but
** WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

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

void reverse (char * to, char * from)
{
  char * from_start = from;
  int j, i, length = 0;
  for (; *(from + i) != '\0'; i++)
    ;
  length = --i;

  for (j = 0; (*(to + j) = *(from + i)) && i > 0; i--, j++)
    ;
}

int main ()
{
  char * str = (char *) malloc (sizeof("hello"));
  reverse (str, "hello");
  printf ("%s\n", str); 
  return 0;
}