Java Exercises: Compute the square root of a given integer

Java Basic: Exercise-117 with Solution

Write a Java program to compute the square root of a given integer.

Pictorial Presentation:

Java Basic Exercises: Compute the square root of a given integer

Sample Solution:

Java Code:

import java.util.*; 
public class Exercise117 {
 public static void main(String[] args)
        int num;
        Scanner in = new Scanner(System.in);	
        System.out.print("Input a positive integer: ");
        int n = in.nextInt(); 
        System.out.printf("Square root of %d is: ",n);
private static int sqrt(int num) {
        if (num == 0 || num == 1) {
			return num;
		int a = 0;
		int b = num;
		while (a <= b) {
			int mid = (a + b) >> 1;
			if (num / mid < mid) {
				b = mid - 1;
			} else {
				if (num / (mid + 1) <= mid) {
					return mid;
				a = mid + 1;
		return a;

Sample Output:

Input a positive integer: 25                                           
Square root of 25 is: 5 


Flowchart: Java exercises: Compute the square root of a given integer

Java Code Editor:

Contribute your code and comments through Disqus.

Previous: Write a Java program which iterates the integers from 1 to 100. For multiples of three print "Fizz" instead of the number and for the multiples of five print "Buzz". When number is divided by both three and five, print "fizz buzz".
Next: Write a Java program to get the first occurrence (Position starts from 0.) of a string within a given string.

What is the difficulty level of this exercise?

Test your Programming skills with w3resource's quiz.

Share this Tutorial / Exercise on : Facebook and Twitter

Java: Tips of the Day


Counts the occurrences of a value in an array.

Use Arrays.stream().filter().count() to count total number of values that equals the specified value.

public static long countOccurrences(int[] numbers, int value) {
    return Arrays.stream(numbers)
            .filter(number -> number == value)

Ref: https://bit.ly/3kCAgLb