Strings and For Loops
 

Hello everyone. My instructor has asked me to write a program that accepts a string as input from a user and prints the string in reverse. I have to use a "for" loop to reverse the string. I am also suppose to allow the user to input more than one string. I think I have done a pretty job at all of the above except for allowing the user to input an additional string. I am taking an intro to C++ and am very new to C++. In the program I have done so far I have defined a character limit of 256. I am confused on how to alow the user to input an additional string. I am not really for sure where to justify this in the body of the program or if it has to be done in the beginning. Any help would be greatly appreciated.

I was thinking it would be here, but I changed the value it did not work.
for (i=0; i<length; i++)

#include  <stdio.h> 

#include  <stdlib.h> 

#include  <string.h>

#define MAXLINE 256

int main(void) 

        

{ 

  

     char str[MAXLINE], rev[MAXLINE];

     int i, length;

    

     /*--------------------------------------------

     *  Read string and determine length  

     *--------------------------------------------*/

     printf("Enter string:    ");

     scanf ("%s", str);

     length= strlen(str);

     /*---------------------------------------------

     *  Build the reversed string and print it.

     * Don't forget to add the terminating 0!

     *---------------------------------------------*/

              /* loop 2 times */ this did not help

      for (i=0; i<length; i++) 

   rev[length-i-1] = str[i];

     rev[length] = 0;

     printf("reverse string:  %s\n\n", rev);

     /*---------------------------

     *  Palindrome?

     *---------------------------*/

     if (strcmp (str,rev) == 0) 

   printf ("Palindrome!\n\n");

     else

   printf ("Not a Palindrome\n\n");

     return 0; 

}

Code tags added. -Narue

Re: Strings and For Loops
 

Throw the whole thing in a loop and break from the loop if the user enters something that isn't valid:

#include  <stdio.h> 

#include  <stdlib.h> 

#include  <string.h>

#define MAXLINE 256

int main(void) 

{ 

  char str[MAXLINE], rev[MAXLINE];

  int i, length;



  for ( ; ; ) {

    /*--------------------------------------------

    *  Read string and determine length  

    *--------------------------------------------*/

    printf("Enter string or EOF to quit:    ");

    if ( scanf ("%s", str) != 1 )

      break;

    length = strlen(str);

    /*---------------------------------------------

    *  Build the reversed string and print it.

    * Don't forget to add the terminating 0!

    *---------------------------------------------*/

    for (i=0; i<length; i++) 

      rev[length-i-1] = str[i];

    rev[length] = 0;

    printf("reverse string:  %s\n\n", rev);

    /*---------------------------

    *  Palindrome?

    *---------------------------*/

    if (strcmp (str,rev) == 0) 

      printf ("Palindrome!\n\n");

    else

      printf ("Not a Palindrome\n\n");

  }



  return 0; 

}