What's wrong with my code?

[mjballa]

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?

[mjballa]

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;
	}
}

[Junky]

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.

[mjballa]

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.

[Junky]

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?

[mjballa]

 
 
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);

[Mr.777]

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.

[grimrader22]

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;
	}
}

[copeg]

...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