Example Programs using Control statements in Java

 

✅ 1. Check if a Number is Even or Odd

Problem: Read a number and check whether it is even or odd.

import java.util.Scanner;

public class EvenOddCheck {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = sc.nextInt();

        if (num % 2 == 0)
            System.out.println(num + " is Even.");
        else
            System.out.println(num + " is Odd.");
    }
}

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✅ 2. Find the Largest of Three Numbers

Problem: Take three numbers as input and find the largest among them.

import java.util.Scanner;

public class LargestOfThree {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter three numbers: ");
        int a = sc.nextInt();
        int b = sc.nextInt();
        int c = sc.nextInt();

        if (a >= b && a >= c)
            System.out.println("Largest: " + a);
        else if (b >= a && b >= c)
            System.out.println("Largest: " + b);
        else
            System.out.println("Largest: " + c);
    }
}

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✅ 3. Print Multiplication Table of a Number

Problem: Read a number and print its multiplication table up to 10.

import java.util.Scanner;

public class MultiplicationTable {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = sc.nextInt();

        for (int i = 1; i <= 10; i++) {
            System.out.println(num + " x " + i + " = " + (num * i));
        }
    }
}

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✅ 4. Sum of Digits of a Number

Problem: Read an integer and find the sum of its digits.

import java.util.Scanner;

public class SumOfDigits {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = sc.nextInt();
        int sum = 0;

        while (num != 0) {
            sum += num % 10;
            num /= 10;
        }

        System.out.println("Sum of digits: " + sum);
    }
}

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✅ 5. Check Whether a Number is Prime

Problem: Read a number and check if it is a prime number.

import java.util.Scanner;

public class PrimeCheck {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a number: ");
        int num = sc.nextInt();
        boolean isPrime = true;

        if (num <= 1)
            isPrime = false;
        else {
            for (int i = 2; i <= Math.sqrt(num); i++) {
                if (num % i == 0) {
                    isPrime = false;
                    break;
                }
            }
        }

        if (isPrime)
            System.out.println(num + " is a Prime Number.");
        else
            System.out.println(num + " is Not a Prime Number.");
    }
}