TCS Digital Capability Assessment | Ques 4 | 20th March 2021 | Slot 1

TCS Digital Capability Assessment | Ques 4 | 20th March 2021 |
Write a program to check if, for a given number N, its power of 4 ends with the number itself or not.

Example: 5 ^ 4 = 5 * 5 * 5 * 5 = 625 and 625 ends with number itself i.e., 5

Instructions:

• The system does not allow any kind of hard coded input value/values.
• The written program code by the candidate will be verified against the inputs that are supplied from the system.
• For more clarification, please read the following points carefully till the end.

Input Format:

Input contains an integer 'N' denoting the number.

Output Format:

If the input number whose power of 4 ends with the number itself, then print "TRUE", otherwise, print "FALSE".

If the user enters a negative integer, then the result should display "Wrong Input".

Constraints :

1 <= N <= 10 ^ 8

 

Example 1:

Input:

5

Output:

TRUE

Explanation: 5 ^ 4 = 5 * 5 * 5 * 5 = 625 and 625 ends with number itself i.e., 5

Example 2:

Input:

25

Output:

TRUE

Explanation:  25^4 = 25 * 25 * 25 *25 = 390625 and 390625 ends with number itself i.e., 25

Example 3:

Input:

7

Output:

FALSE

Example 4:

Input:

-6

Output:

Wrong Input

Explanation: Since input doesn't match input constraint i.e., 1<=N<=10^8

Java Solution:

import java.util.Scanner;

public class PowerOfFour {

	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		int no = sc.nextInt();
		long powerFour = (long) Math.pow(no, 4);

		String inputNoAsString = String.valueOf(no);
		String outputNoAsString = String.valueOf(powerFour);

		String endDigit = outputNoAsString.substring(
				outputNoAsString.length() - inputNoAsString.length(), outputNoAsString.length());

		if(no < 0) {
			System.out.println("Wrong Input");
		} else if (inputNoAsString.equals(endDigit)) {
			System.out.println("TRUE");
		} else {
			System.out.println("FALSE");
		}
	}
}

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