DAY 1

1)

import java.util.Scanner;

public class NumberSeries {
    public static void main(String[] args) {
        //Initialize Scanner class for user input
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter a starting number: ");
        int start = sc.nextInt();

        System.out.print("Enter an ending number: ");
        int end = sc.nextInt();

        //Perform a while loop to display numbers between start and end numbers
        int i = start;
        while (i <= end) {
            System.out.print(i + " ");
            i++;
        }
        sc.close();
    }
}

2) 

import java.util.Scanner;

public class AverageValue {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        System.out.print("Enter an integer value, (0 to end and get average): ");
        int num = sc.nextInt();
        int sum = 0;
        int count = 0;
        while (num != 0) {
            sum += num;
            count++;
            System.out.print("Add another integer value, (0 to end and get average): ");
            num = sc.nextInt();
        }
        System.out.printf("The average is: %.2f", sum/((double)count));
        sc.close();
    }

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DAY 2

a) 

public static void main(String []args) {
        //declaring and initializing variables
        int fact = 1;
        int i = 1;

        //creating object of Scanner class
        Scanner sc = new Scanner(System.in);

        //accepting a number from the user
        System.out.print("Enter a number whose factorial is to be found: ");
        int num = sc.nextInt();

        //counting the factorial using while loop
        while( i <= num ) {
            fact = fact * i;
            i++; //increment i by 1
        }

        //printing the result
        System.out.println("\nFactorial of " + num + " is: " + fact);
    }

b) 

import java.util.Scanner;

public class ReverseNumber {
    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);

        // Step 1: Prompt the user
        System.out.print("Enter an integer: ");
        int num = input.nextInt();

        // Step 2: Create variables
        int reverseNum = 0; // to hold reversed number
        int rem = 0;        // to hold remainders

        // Step 3: Loop until num becomes 0
        while (num != 0) {
            // get remainder (last digit)
            rem = num % 10;

            // shift digits in reverseNum to the left
            reverseNum = reverseNum * 10 + rem;

            // remove last digit from num
            num = num / 10;
        }

        // Step 4: Output the result
        System.out.println("Reversed number: " + reverseNum);

        input.close();
    }
}

3) 10
   5
   6
   3
   4
   2

4)  

total = 0; //important to make sure total is 0
k = 1;
do {
   total + =Math.pow(k,2); //OR k*k
   k++;
} while (k <= 50);