Palindrome Number|Word Program in C

Palindrome Number|Word Program in C

Palindrome number: On reversing a number if the reversed number is equal to the original number then the number is called Palindrome number.

Palindrome word: On reversing a word if the reversed word is equal to the original word then the word is called Palindrome word.

Example of palindrome numbers : 11, 22, 121, 111, 12321,etc.

Example of non palindrome numbers : 12, 27, 96, 123, 12312,etc.

Example of palindrome words: mam, dad, mom, madam, etc.

Example of non-palindrome words: teacher, father, mother, madman, etc.

Algorithm:

Step 1: Accept a number/word from the user and store it in a variable say number/word.

Step 2: Reverse the number and store it in another variable say 'reverse'.

Step 3: Check if the number is equal to the 'reverse' then Display "The Given number is a Palindrome number"

else

Display "The Given number is not a Palindrome number".

Sample Input/Output:

Sample Input 1:

Enter number: 121

Sample Output 1:

The given number is a palindrome number

Sample Input 2:

Enter number: 123

Sample Output 2:

The given number is not a palindrome number

Program in C to check whether a given number is a palindrome number or not:

Code 1: This code will only work for checking Palindrome numbers and not palindrome words.

/* C Program to check whether a given number is a Palindrome Number or not */
#include <stdio.h>
int main()
{
    int number, counter = 0;
    printf("Enter number here : ");
    scanf("%d", &number);
    int reverse = 0;
    int numberCopy = number;
    while (numberCopy > 0)
    {
        int lastDigitOfNumber = numberCopy % 10;
        reverse = reverse * 10 + lastDigitOfNumber;
        numberCopy = numberCopy / 10;
    }
    if (number == reverse)
        printf("Number is Palindrome");
    else
        printf("Number is not Palindrome");
    return 0;
}

Code 2: This code will work for checking both Palindrome Number and Palindrome Word.

/* C Program to check whether a given word/number is a Palindrome or not */
#include <stdio.h>
#include <string.h>
int main()
{
    char word[20];
    int i, len;
    printf("Enter number here : ");
    gets(word);
    len = strlen(word);
    char reverse[20];
    reverse[len] = '\0';
    for (i = 0; i < len; i++)
    {
        reverse[len - i - 1] = word[i];
    }
    if (strcmp(word, reverse) == 0)
        printf("Word is Palindrome");
    else
        printf("Word is not Palindrome");
    return 0;
}

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