ICSE Class 10 Computer Applications
Question 44 of 69
Iterative Constructs in Java — Question 44
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Question Question 31
Write a menu driven class to accept a number from the user and check whether it is Palindrome or a Perfect number.
- Palindrome number: A number is a Palindrome which when read in reverse order is same as read in the right order Example: 11, 101, 151, etc.
- Perfect number: A number is called Perfect if it is equal to the sum of its factors other than the number itself.
Example: 6 = 1 + 2 + 3
import java.util.Scanner;
public class KboatPalinOrPerfect
{
public static void main(String args[]) {
Scanner in = new Scanner(System.in);
System.out.println("1. Palindrome number");
System.out.println("2. Perfect number");
System.out.print("Enter your choice: ");
int choice = in.nextInt();
System.out.print("Enter number: ");
int num = in.nextInt();
switch (choice) {
case 1:
int copyNum = num;
int revNum = 0;
while(copyNum != 0) {
int digit = copyNum % 10;
copyNum /= 10;
revNum = revNum * 10 + digit;
}
if (revNum == num)
System.out.println(num + " is palindrome");
else
System.out.println(num + " is not palindrome");
break;
case 2:
int sum = 0;
for (int i = 1; i <= num / 2; i++) {
if (num % i == 0) {
sum += i;
}
}
if (num == sum)
System.out.println(num + " is a perfect number");
else
System.out.println(num + " is not a perfect number");
break;
default:
System.out.println("Incorrect Choice");
break;
}
}
}Output
