Sep 30, 2011

C program to read a string and check whether it is a palindrome or not (without using library functions).

Write a C program to read a string and check whether it is a palindrome or not (without using library functions). Output the given string along with suitable message.Palindrome is a word, sentence, group of characters, or number, that remains same, when reversed.
For example: GADAG, 9009... Read more about C Programming Language .

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

void main()
{
 char string[25], revString[25]={'\0'};
 int  i,length = 0, flag = 0;

 clrscr();

 fflush(stdin);

 printf("Enter a string\n");
 gets(string);

 for (i=0; string[i] != '\0'; i++) /*keep going through each */
 {                                 /*character of the string */
  length++;                     /*till its end */
 }

 for (i=length-1; i >= 0 ; i--)
 {
  revString[length-i-1] = string[i];
 }

 /*Compare the input string and its reverse. If both are equal
   then the input string is palindrome. Otherwise it is
   not a palindrome */

 for (i=0; i < length ; i++)
 {
  if (revString[i] == string[i])
   flag = 1;
  else
   flag = 0;
 }

 if (flag == 1)
  printf ("%s is a palindrome\n", string);
 else
  printf("%s is not a palindrome\n", string);

}   /*End of main()*/
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