/* 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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Tagged as: 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., without using library functions