C Program to Check Palindrome

18CPL17/27

Program 3:-

Develop a program to find the reverse of a positive integer and check for palindrome or not. Display appropriate messages.

ALGORITHM

Purpose: To check the given integer is palindrome or not

Input: Num

Output: Reverse and palindrome or not

START

STEP 1: [Input a number]

read num

STEP 2: [To check the given number is 4 digits or not] If the number less than 999 or greater than 9999 print “it is not a four-digit number”

Go to step 5

STEP 3: [Calculate the reverse of the given number]

Temp=num

Loop while temp not equal to 0

Remainder=temp%10

Temp=temp/10

Reverse=reverse*10+remainder

print “reverse number”

STEP 4: [Check number is a palindrome or not]

If Num is equal to reverse

print “Num is a palindrome “

Else

print “Num is not a palindrome”

STEP 5: [Finished]

STOP

FLOWCHART

C Code

#include <stdio.h>
int main()
{
    int n, reversedInteger = 0, remainder, originalInteger;
    printf("Enter an integer: ");
    scanf("%d", &n);
    originalInteger = n;
    // reversed integer is stored in variable 
    while( n!=0 )
    {
        remainder = n%10;
        reversedInteger = reversedInteger*10 + remainder;
        n /= 10;
    }
    // palindrome if orignalInteger and reversedInteger are equal
    if (originalInteger == reversedInteger)
        printf("%d is a palindrome.", originalInteger);
    else
        printf("%d is not a palindrome.", originalInteger);
    
    return 0;
}

Output

******************************************************************************

Output 2:

Enter a number to check if it is a palindrome or not

1234

1234 is not a palindrome number

Output 3:

Enter a number to check if it is a palindrome or not

1221

1221 is a palindrome number

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C Program to Check Palindrome