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!

Quote:

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There are many ways to skin a cat!

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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.

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

Quote:

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Originally Posted by That1guy

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);

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.

Code :

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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();
		}
	}
}

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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!

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

Code java:

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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;
}
}

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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

Code java:

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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;
}
}

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You'll have to do something similar for the other ones.