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Thread: Allowing user to input variable.

  1. #1
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    Default Allowing user to input variable.

    Hello, I'm new to programming, and could use a little help with something!

    I feel like I'm missing the obvious answer, but I just cant think of it!

    I'm trying to allow the user to input 5 variables when the program prompts them, and then these variables will be used later on as the number amount of fabricated items that the user has to use.

    For Example:
     


    "Hello! Input the number of Arrows you want!"

    "=user inputs #="

    "You have # arrows! How many arrows would you like to use?"

    "user inputs #"



    I need the number the user inputted to be a variable, so that the user cant use more of the item than they inputed that they had.

    I'm sorry for posting no code, but I don't see how posting it here would help with what I need to know.

    Thanks!


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    Default Re: Allowing user to input variable.

    There are many ways to skin a cat!
    Check out this:
    Java Tips - How to read input from console

    Otherwise, if you wanted something bigger/permanently store values and go beyond the basics, then I suggest reading a Java programming book or online resources, and generate something amazing.

    Hope this helps.

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    That1guy (November 15th, 2010)

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    Default Re: Allowing user to input variable.

    Or better yet, try - http://www.javaprogrammingforums.com...ner-class.html

    There are lots of examples in our Code Snippets forum - Java Code Snippets and Tutorials - Java Programming Forums
    Please use [highlight=Java] code [/highlight] tags when posting your code.
    Forum Tip: Add to peoples reputation by clicking the button on their useful posts.

    Looking for a Java job? Visit - Java Programming Careers

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    That1guy (November 15th, 2010)

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    Smile Re: Allowing user to input variable.

    Quote Originally Posted by That1guy View Post
    Hello, I'm new to programming, and could use a little help with something!

    I feel like I'm missing the obvious answer, but I just cant think of it!

    I'm trying to allow the user to input 5 variables when the program prompts them, and then these variables will be used later on as the number amount of fabricated items that the user has to use.

    For Example:
     


    "Hello! Input the number of Arrows you want!"

    "=user inputs #="

    "You have # arrows! How many arrows would you like to use?"

    "user inputs #"



    I need the number the user inputted to be a variable, so that the user cant use more of the item than they inputed that they had.

    I'm sorry for posting no code, but I don't see how posting it here would help with what I need to know.

    Thanks!
    Scanner console = new Scanner(System.in);
    int numOfArrows = 0;
    int numberOfArrowsToUse = 0;
    System.out.println("Hello! Input the number of Arrows you want!");
    numOfArrows = console.nextInt();

    System.out.println("You have " + numOfArrows + " arrows! How many arrows would you like to use?");
    numOfArrowsToUse = console.nextInt();

    However, if you're using JOptionPane, then

    int numOfArrows = 0;
    int numberOfArrowsToUse = 0;
    // JOptionPane.showInputDialog( Component parent, String message, Object title, int messageType);
    String str = JOptionPane.showInputDialog(null, "Hello! Input the number of arrows you want!", "Input number of arrows", JOptionPane.QUESTION_MESSAGE);
    numOfArrows = Integer.parseInt(str);
    String str2 = JOptionPane.showInputDialog(null, "You have " + numOfArrows + " arrows! How many arrows would you like to use?", "How many do you want to use?", JOptionPane.QUESTION_MESSAGE);

    numberOfArrowsToUse = Integer.parseInt(str2);

  7. The Following User Says Thank You to javapenguin For This Useful Post:

    That1guy (November 15th, 2010)

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    Default Re: Allowing user to input variable.

    Thank you all!

    I used the Arrow simulation provided by javapenguin above; and after a little tweaking, got it to run perfectly. I then used that to start working on what I actually have in mind; but when compling it, I keep running into errors; and I cant quite figure out what I have wrong.

    import java.util.Scanner;
     
    class Cafe
    {
    	public static void main(String[] args)
    	{
    		Scanner scan = new Scanner(System.in);
     
    		int mealA = 0;
    		int mealB = 0;
    		int mealC = 0;
    		int mealD = 0;
    		int mealE = 0;
    		int mealtoeat = 0;
     
     
    		System.out.println("Please tell me what first food you want to make!");
    		foodA = scan.nextLine();
    		System.out.println("Please tell me what second food you want to make!");
    		foodB = scan.nextLine();
    		System.out.println("Please tell me what third food you want to make!");
    		foodC = scan.nextLine();
    		System.out.println("Please tell me what fourth food you want to make!");
    		foodD = scan.nextLine();
    		System.out.println("Please tell me what fifth food you want to make!");
    		foodE = scan.nextLine();
     
    		System.out.println("How many " + foodA + " do you want to make?");
    		meal1 = scan.nextInt();
    		System.out.println("How many " + foodB + " do you want to make?");
    		meal2 = scan.nextInt();
    		System.out.println("How many " + foodC + " do you want to make?");
    		meal3 = scan.nextInt();
    		System.out.println("How many " + foodD + " do you want to make?");
    		meal4 = scan.nextInt();
    		System.out.println("How many " + foodE + " do you want to make?");
    		meal5 = scan.nextInt();
    		{
     
    			System.out.println(foodA + " " + mealA);
    			System.out.println(foodB + " " + mealB);
    			System.out.println(foodC + " " + mealC);		
    			System.out.println(foodD + " " + mealD);
    			System.out.println(foodE + " " + mealE);
     
    			System.out.println("What would you like to eat?");
     
    			//How do I make sure that the user can only enter one of the foods they chose to make?
     
    			System.out.println("You have " + //??? + " of " + //??? + "! How many 
     + //??? + " would you like to eat?");
    			mealtoeat = scan.nextInt();
    		}
    	}
    }

    I got alot of errors around the "How many ___ do you want to make?" parts of it.

    Also, as you can see by my notes left in, I cant quite figure how to make sure that the user can only input the foods they chose to make. If someone could direct me to somplace where I can learn more about that; it would be much appriciated.

    Thanks again!

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    Default Re: Allowing user to input variable.

    get rid of the set of brackets that start after meal5 = scan.nextInt() and that end after mealtoeat = scan.nextInt(), those aren't needed and will cause errors.
    try adding
    String foodA = " ";
    String foodB = " ";
    String foodC = " ";
    String foodD = " ";
    String foodE = " ";
    int mealtoeat2 = 0;
    and
    int meal1 = 0;
    int meal2 = 0;
    int meal3 = 0;
    int meal4 = 0;
    int meal5  = 0;
     
    int choice =0;
     
    System.out.println("Choose the meal you want to eat.  1 = " + foodlA + " 2 = " + foodlB + " 3 = " + foodC + " 4 = " + foodD + " 5 = " + foodE + ".");
     
    boolean isAValidMeal = false;
     
    while (isAValidMeal ==false)
    {
    mealtoeat = scan.nextInt();
     
    if (mealtoeat==1)
    {
    what you'll do when it's 1
    isAValidMeal = true;
    }
     
    else if (mealtoeat ==2)
    {
    what you'll do when it's 2
    isAValidMeal = true;
    }
     
    else if (mealtoeat ==3)
    {
    what you'll do when it's 3
    isAValidMeal = true;
    }
     
    else if (mealtoeat ==4)
    {
    what you'll do when it's 4
    isAValidMeal = true;
    }
     
    else if (mealtoeat ==5)
    {
    what you'll do when it's 5
    isAValidMeal =true;
    }
     
    else
    {
    System.out.println("Enter a value between 1 and 5.");
    isAValidMeal = false;
    }
    }

    I'm assuming you're asking how many of a certain meal type of a certain food you'd like to eat.

    If so, within each if and else if statement, have, for example, for the first if statement

    boolean isAValidNumber = false;
     
    while (isAValidNumber == false)
    {
    System.out.println("You have " + meal1 + " of  " + mealA + "! How many " + mealA + " would you like to eat?");
    mealtoeat2 = console.nextInt();
     
    if (mealtoeat2 > 0 && mealtoeat2 <= meal1)
    {
    it works and do what you have to do
    isAValidNumber = true;
    }
     
    else
    {
    System.out.println("Enter a number at least 0 and at most the number of meals you made for that type.");
    isAValidNumber = false;
    }
    }


    You'll have to do something similar for the other ones.
    Last edited by javapenguin; November 16th, 2010 at 12:43 AM. Reason: Adding code block

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