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Tuesday, December 20, 2011

C program to find the palindrome of a number



 /* 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  */

 #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()*/

/*----------------------------------------------------
Output
RUN 1
Enter a string
madam
madam is a palindrome

RUN 2
Enter a string
Madam
Madam is not a palindrome

RUN 3
Enter a string
good
good is not a palindrome
----------------------------------------------------------*/



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