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Thread: What's wrong with my code?

  1. #1
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    Default What's wrong with my code?

    import java.util.Scanner;

    public class Lab8_Ex2
    {
    public static void main(String[] args)
    {
    int age;
    int beatsPerMinute;


    Scanner keyboard = new Scanner(System.in);

    System.out.print("Please enter your age. ");
    age = keyboard.nextInt();

    System.out.print("Please enter the number of heartbeats " +
    "counted in one minute. ");
    beatsPerMinute = keyboard.nextInt();

    heartRate = targetHeartRate(heartRate);

    if(heartRate == true)
    {
    System.out.print("You are in your target heart rate.");
    }
    else
    {
    System.out.print("You are not in your target heart rate.");
    }

    }

    public static boolean targetHeartRate(int age, int beatsPerMinute)
    {
    int maxHeartRate = 0;
    double targetRate = 0.0;
    boolean heartRate;

    maxHeartRate = 220 - age;
    targetRate = maxHeartRate * .65;

    if(targetRate == beatsPerMinute)
    {
    heartRate = true;
    }

    else
    {
    heartRate = false;
    }
    return heartRate;
    }
    }[/CODE]

    What did I do wrong?


  2. #2
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    Default Re: What's wrong with my code?

    sorry I pasted it wrong. here it is!

     
     
    import java.util.Scanner;
     
    public class Lab8_Ex2
    {
    	public static void main(String[] args)
    	{
    		int age;
    		int beatsPerMinute;
     
     
    		Scanner keyboard = new Scanner(System.in);
     
    		System.out.print("Please enter your age. ");
    		age = keyboard.nextInt();
     
    		System.out.print("Please enter the number of heartbeats " +
    			"counted in one minute. ");
    		beatsPerMinute = keyboard.nextInt();
     
    		heartRate = targetHeartRate(heartRate);
     
    		if(heartRate == true)
    		{
    			System.out.print("You are in your target heart rate.");
    		}
    		else
    		{
    			System.out.print("You are not in your target heart rate.");
    		}
     
    	}
     
    	public static boolean targetHeartRate(int age, int beatsPerMinute)
    	{
    		int maxHeartRate = 0;
    		double targetRate = 0.0;
    		boolean heartRate;
     
    		maxHeartRate = 220 - age; 
    		targetRate = maxHeartRate * .65;
     
    		if(targetRate == beatsPerMinute)
    		{
    			heartRate = true;
    		}
     
    		else
    		{
    			heartRate = false;
    		}
    		return heartRate;
    	}
    }

  3. #3
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    Default Re: What's wrong with my code?

    Quote Originally Posted by mjballa View Post
    What did I do wrong?
    How would we know? Feel like providing more details? Such as error messages. Output you get, output you want and explain the difference.
    Improving the world one idiot at a time!

  4. #4
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    Default Re: What's wrong with my code?

    Lab8_Ex2.java:22: cannot find symbol
    symbol : variable heartRate
    location: class Lab8_Ex2
    targetHeartRate(heartRate);
    ^


    Lab8_Ex2.java:24: cannot find symbol
    symbol : variable heartRate
    location: class Lab8_Ex2
    if(heartRate == true)
    ^


    those are the two errors I'm getting.

  5. #5
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    Default Re: What's wrong with my code?

    The error message is clear. The compiler cannot find the declaration for the heartRate variable.
    public static void main(String[] args)
    {
        int age;
        int beatsPerMinute;
     
        Scanner keyboard = new Scanner(System.in);
     
        System.out.print("Please enter your age. ");
        age = keyboard.nextInt();
     
        System.out.print("Please enter the number of heartbeats " + "counted in one minute. ");
        beatsPerMinute = keyboard.nextInt();
     
        heartRate = targetHeartRate(heartRate);
     
        if(heartRate == true)
        {
            System.out.print("You are in your target heart rate.");
        }
        else
        {
            System.out.print("You are not in your target heart rate.");
        }
    }
    Where in that code have you declared the variable?
    Improving the world one idiot at a time!

  6. #6
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    Default Re: What's wrong with my code?

     
     
    import java.util.Scanner;
     
    public class Lab8_Ex2
    {
    	public static void main(String[] args)
    	{
    		int age;
    		int beatsPerMinute;
    		boolean heartRate;
     
    		Scanner keyboard = new Scanner(System.in);
     
    		System.out.print("Please enter your age. ");
    		age = keyboard.nextInt();
     
    		System.out.print("Please enter the number of heartbeats " +
    			"counted in one minute. ");
    		beatsPerMinute = keyboard.nextInt();
     
    		heartRate = targetHeartRate(heartRate);
     
    		if(heartRate == true)
    		{
    			System.out.print("You are in your target heart rate.");
    		}
    		else
    		{
    			System.out.print("You are not in your target heart rate.");
    		}
     
    	}
     
    	public static boolean targetHeartRate(int age, int beatsPerMinute)
    	{
    		int maxHeartRate = 0;
    		double targetRate = 0.0;
    		boolean heartRate;
     
    		maxHeartRate = 220 - age; 
    		targetRate = maxHeartRate * .65;
     
    		if(targetRate == beatsPerMinute)
    		{
    			heartRate = true;
    		}
     
    		else
    		{
    			heartRate = false;
    		}
    		return heartRate;
    	}
    }

    I added the initialization.
    but now I am getting this error when attempting to compile:

    Lab8_Ex2.java:23: targetHeartRate(int,int) in Lab8_Ex2 cannot be applied to (boolean)
    heartRate = targetHeartRate(heartRate);

  7. #7
    Think of me.... Mr.777's Avatar
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    Default Re: What's wrong with my code?

    heartRate = targetHeartRate(heartRate);
    Check the definition of targetHeartRate(). It's not accepting boolean anywhere. You must be able to trace the error on your own.
    targetHeartRate() is accepting two integers, but you are passing it boolean. What i guess is you misunderstood the parameters and return type.
    It's returning boolean but accepting two integers.

  8. #8
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    Default Re: What's wrong with my code?

    I made some changes but I don't know if this is what you want as the result
     
    import java.util.Scanner;
     
    public class Lab8_Ex2
    {
    	private static boolean heartRate;
    	public static void main(String[] args)
    	{
    		int age;
    		int beatsPerMinute;
     
     
    		Scanner keyboard = new Scanner(System.in);
     
    		System.out.print("Please enter your age. ");
    		age = keyboard.nextInt();
     
    		System.out.print("Please enter the number of heartbeats " +
    			"counted in one minute. ");
    		beatsPerMinute = keyboard.nextInt();
     
    		heartRate = targetHeartRate(age, beatsPerMinute);
     
    		if(heartRate == true)
    		{
    			System.out.print("You are in your target heart rate.");
    		}
    		else
    		{
    			System.out.print("You are not in your target heart rate.");
    		}
     
    	}
     
    	public static boolean targetHeartRate(int age, int beatsPerMinute)
    	{
    		int maxHeartRate = 0;
    		double targetRate = 0.0;
     
     
    		maxHeartRate = 220 - age; 
    		targetRate = maxHeartRate * .65;
     
    		if(targetRate == beatsPerMinute)
    		{
    			heartRate = true;
    		}
     
    		else
    		{
    			heartRate = false;
    		}
    		return heartRate;
    	}
    }

  9. #9
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    Default Re: What's wrong with my code?

    Quote Originally Posted by grimrader22 View Post
    ...but I don't know if this is what you want as the result
    Which is exactly why we discourage spoonfeeding. Please read the forum rules and the following article
    http://www.javaprogrammingforums.com...n-feeding.html

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