Java: Test if a given number is a perfect square or not
Java Basic: Exercise-197 with Solution
Write a Java program to test if a given number (positive integer) is a perfect square or not.
Input number: 3 Output: 1 2 3 8 9 4 7 6 5Visual Presentation:
Sample Solution:
Java Code:
// Import Scanner class from java.util package for user input
import java.util.*;
// Main class for the solution
public class Solution {
// Main method to execute the solution
public static void main(String[] args) {
// Create a Scanner object for user input
Scanner in = new Scanner(System.in);
// Prompt the user to input a positive integer
System.out.print("Input a positive integer: ");
// Read the user input as an integer
int n = in.nextInt();
// Display the result of the is_Perfect_Square function
System.out.print("Is the said number perfect square? " + is_Perfect_Square(n));
}
// Function to check if a given number is a perfect square
public static boolean is_Perfect_Square(int n) {
// Extract the last digit of the number
int x = n % 10;
// Check if the last digit is 2, 3, 7, or 8 (numbers whose squares end with these digits)
if (x == 2 || x == 3 || x == 7 || x == 8) {
return false;
}
// Iterate from 0 to half of the input number plus 1
for (int i = 0; i <= n / 2 + 1; i++) {
// Check if the square of the current iteration is equal to the input number
if ((long) i * i == n) {
return true;
}
}
// If no perfect square is found, return false
return false;
}
}
Sample Output:
Input a positive integer: 6 Is the said number perfect square? false
Flowchart:
Java Code Editor:
Company: LinkedIn
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