Question

Language is C

1. Palindrome Write a program that prompts the user for a positive integer number and output whether the number is a palindrome or not. A palindrome number is a number that is the same when reversed. For example, 12321 is a palindrome; 1234 is not a palindromoe. You will write a function named as palindrome. The function will have two arguments, number and isPalindrome. Both arguments are pass-by-reference. The argument number is a pointer to a variable that stores the user input value. The function determines whether the user input number is a palindrome or not. If the number is a palindrome, then the function uses its second argument isPalindrome to set its value to 1 or 0 if the number is not a palindrome void palindrome(int number, int *isPalindrome); The main function prompts the user to enter a number. Then it calls the palindrome function. The palindrome function takes two arguments. The first argument is the address of the variable that stores the user input value. The second input passes the address of another variable that will be set to the value 1 (if the number is a palindrome), or 0 (if the number is not a palindrome). Then based on the this value (1 or 0), the main function displays an appropriate message Sample Output Enter a number 4546454 4546454 is a palindrome. Enter a number 37374040 37374040 is not a palindrome.

Answer 1

#include<stdio.h>

void palindrome(int *number, int *isPalindrome)

{

    // store the number in a local variable

    int n = *number;

   

    // store the reverse of n

    int reverse = 0;

   

    // reverse n and store in 'reverse'

    while( n > 0 )

    {

        // get the digit at ones place

        int t = n % 10;

       

        reverse = 10 * reverse + t;

       

        // remove the digit at ones place

        n /= 10;

    }

   

    // if number is palindrome

    if( reverse == *number )

        *isPalindrome = 1;

    // if number is not palindrome

    else

        *isPalindrome = 0;

}

int main()

{

    int number;

   

    printf("Enter a number : ");

   

    // get user input

    scanf("%d", &number);

   

    int isPalindrome = 0;

   

    palindrome(&number, &isPalindrome);

   

    if( isPalindrome == 1 )

        printf("%d is a palindrome.", number);

    else

        printf("%d is not a palindrome.", number);

}

Sample Output

Enter a number 4546454 4546454 is a palindrome