Thread: While loop to perform multiple steps Please help assignment due in 12 hours!!

Thanks for the tips!

Okay I tried correcting it

Can you please just help me besides critizing my curly braces? I understand its important but I need help with the actual program. I will figure out the format of it later. I need help with the logic ASAP

--- Update ---

Okay I think I fixed it. But i need to properly initialize firstNum and secondNum. I am so lost lol..

--- Update ---

updated a little. Im just trying to piece it together with what i know. If someone could help me clean it up and help with the rest that would be awesome!

import java.util.Scanner;
 
public class whileLoop
{
	public static void main(String[] args)
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		//Part A
		int firstNum;
		int secondNum;
		int i;
 
		System.out.println("Please enter two integers: ");
 
		//Part B
		int temp = firstNum;
		while(temp <= secondNum)
		{
			if(temp % 2 != 0)
		    {
		       System.out.println(""+temp);
		    }
		    temp++;
 			}
	}
}
 
		//Part C
		int i=firstnumber;
		int sum=0;
		int sumofsqr=0;
 
		while(i<=secondnumber)
			{
		    if(i%2==0)
		    {
		    	System.out.println(i);
		    	sum+=i;
		    }
		    else
		    {
		    //Part E
		    	sumofsqr+=i*i;
		    }
		    i++;
			}
				System.out.println("Sum of even " + sum + " Sum of sqr of odd " + sumofsqr);
	}
}

Hello all! I have a assignment due tomorrow morning and I am totally clueless. I have tried reading a bunch of things on while loops but dont seem to understand it fully. This is my directions for the assignment:

Write a program that uses a while loop to perform the following steps:
Comment by labelling each part: //Part A, //Part B, etc...
A.)Prompt the user to input 2 integers: firstNum and secondNum. Use 10 and 20.
B.)Output all odd numbers between firstNum and secondNum.
C.)Output the sum of all even numbers between firstNum and secondNum.
D.)Output the numbers and their square between 1 and 10.
E.)Output the sum of the square of odd numbers between firstNum and secondNum.
F.)Output all uppercase letters.

Again I am new to while loops and I am totally lost. I have tried reading a bunch but I am better at learning if someone shows me how to do something. I am open to all suggestions. I have just completed 8 other programs using if else statements and now trying to get the hang of loops. Thanks!

This is my pathetic attempt so far LOL its all pieced together from what i know and its missing a lot. If someone could show me how to make it all work together that would be awesome!

import java.util.Scanner;
 
public class whileLoop
{
	public static void main(String[] args)
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		//Part A
		int firstNum;
		int secondNum;
		int i;
 
		System.out.println("Please enter two integers: ");
 
		//Part B
		int temp = firstNum;
		while(temp <= secondNum)
		{
			if(temp % 2 != 0)
		    {
		       System.out.println(""+temp);
		    }
		    temp++;
 			}
	}
}
 
		//Part C
		int i=firstnumber;
		int sum=0;
		int sumofsqr=0;
 
		while(i<=secondnumber)
			{
		    if(i%2==0)
		    {
		    	System.out.println(i);
		    	sum+=i;
		    }
		    else
		    {
		    //Part E
		    	sumofsqr+=i*i;
		    }
		    i++;
			}
				System.out.println("Sum of even " + sum + " Sum of sqr of odd " + sumofsqr);
	}
}

Yes I am familiar with Scanner. I prompted the user to input two integers but now i need to read from the keyboard the values they entered which should be 10 and 20. Above I posted the directions for the assignment in my original post. I need to initialize firstNum (10) and secondNum (20) but not sure where to initialize them.

Originally Posted by dicdic

Okay, I read the problem A.) only. then I looked at your code, you did not manage to prompt for user's input right?
Let's fix your problem from the top 1 by 1.
Do you know how to use the Scanner for user's input?

Okay I got it to work and output all odd numbers between 10 and 20... onto the next part!

import java.util.Scanner;
 
public class whileLoop
{
	public static void main(String[] args)
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		//Part A
		System.out.println("Please enter two integers: ");
 
		//Part B
		int firstNum = keyboard.nextInt();
		int secondNum = keyboard.nextInt();
		int temp = firstNum;
		while(temp <= secondNum)
		{
			if(temp % 2 != 0)
		    {
		       System.out.println(""+temp);
		    }
		    temp++;
 			}
	}
}

Part C) I need to output the sum of all even numbers between firstNum and secondNum (10,20). How would I transition into that? I have only done simple one part programs.

		int i = firstNum;
		int sum = 0;
 
		while(i <= secondNum)
		    {
		    if(i % 2 == 0)
		    {
		    	System.out.println(i);
		    	sum += i;
                    }
                    System.out.println("Sum of even " + sum + ");
              }
    }

--- Update ---

I guess that is how I would get the sum of all even numbers between first and second Num. But not sure how to tie it into the program as a whole

Can you show me a example? not with my assignment but something general? I am a visual learner. I am not asking for someone to do my assignment becasue i want to learn it but i also need something visual

This is my whole program so far... steps A through E. The directions again are posted above. I am just piecing together what I know. The logic is there but the format definitely isnt.

import java.util.Scanner;
 
public class whileLoop
{
	public static void main(String[] args)
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		//Part A
		System.out.println("Please enter two integers, the first must be less than second: ");
 
		//Part B
		int firstNum = keyboard.nextInt();
		int secondNum = keyboard.nextInt();
		int temp = firstNum;
		while(temp <= secondNum)
		{
			if(temp % 2 != 0)
		    {
		       System.out.println(""+temp);
		    }
		    temp++;
 			}
 
		//Part C
		int i = firstNum;
		int sum = 0;
 
		while(i <= secondNum)
			{
		    if(i % 2 == 0)
		    {
		    	System.out.println(i);
		    	sum += i;
		    }
		//Part D
		    for (int i= 1; i <= 10; i++)
		    {
		    	System.out.println(i+" "+i*i);
		    {
		//Part E
		while(firstNum <= secondNum)
 
		    sumofsqr += i * i;
		    }
		    	i++;
			}
					System.out.println("Sum of even " + sum + " Sum of sqr of odd " + sumofsqr);
	}
}

just use if and if else statments to tie it all together?

import java.util.Scanner;
 
public class twoIntegers
{
	public static void main(String[] args)
	{
 
		Scanner keyboard = new Scanner(System.in);
 
		//Part A
		//Input two integers
 
		System.out.println("Please enter two integers,"
						  + "the first must be less than second: ");
 
		//Part B
		//All odd numbers between firstNum and secondNum
 
		int firstNum = keyboard.nextInt();
		int secondNum = keyboard.nextInt();
		int temp = firstNum;
		int sum = 0;
		String oddNum = "";
		int sumSqr = 0;
 
		while(temp <= secondNum)
		{
			if(temp % 2 != 0)
		    {
			oddNum = oddNum + temp + " ";
			}
		    temp++;
		}
		System.out.println("The odd numbers are: " + oddNum);
 
		//Part C
		//Sum of all even numbers between firstNum and secondNum
 
		temp = firstNum;
		while(temp <= secondNum)
		{
		    if(temp % 2 == 0)
		    {
		    	sum += temp;
		    }
				temp++;
		}
		System.out.println("The sum of all even numbers: " + sum);
 
		//Part D
		//Output the numbers and their square between 1 and 10
 
		int i = 1;
 
		while(i <= 10)
		{
			System.out.println("" + (i * i));
			i++;
		}
 
		//Part E
		//Output the sum of square of odd numbers
 
		temp = firstNum;
 
		while(temp <= secondNum)
		{
			if(temp % 2 != 0)
			{
				sumSqr += temp * temp;
			}
				temp++;
		}
		System.out.println("Sum of the square of odd numbers: " + sumSqr);
 
		//Part F
		//Output all uppercase letter.
 
		i = 0;
 
		while(i < 26)
		{
			System.out.println((char) (i + 65));
			i++;
		}
	}
}

--- Update ---

This is my finished program. However the output is correct but messy. How would I output the output horizontally instead of vertically?