Creating a static method for calculating averages

[Tommy Cregan]

Hi all,

Ive been asked to create a class that has a static method which displays the total result of 3 user input results(the first and second are 15% and the third is 70%) but im getting an error due to what i think is
outputting a string which contains a double. Please help! Heres the code

public class WeightedAverage{
	
	private double result1;
	private double result2;
	private double result3;
	//public double mark;
	
	public WeightedAverage(double res1,double res2,double res3)
	{
		this.result1=res1;
		this.result2=res2;
		this.result3=res3;
	}

	public void setResult1(double res1)
	{
		this.result1=res1;		
	}
	
	public void setResult2(double res2)
	{
		this.result2=res2;
	}
	
	public void setResult3(double res3)
	{
		this.result3=res3;
	}
	
	public double getResult1()
	{
		return result1;
	}
	
	public double getResult2()
	{
		return result2;
	}
	
	public double getResult3()
	{
		return result3;
	}
	
	public String toString()
	{
		return String.format("Result 1:%g \n\nResult 2: %g \n\nResult 3: %g",result1,result2,result3);
	}
	
	public static Double calcOverallMark(WeightedAverage w){
		
		double f = w.getResult1()/15*100;
		double s = w.getResult2()/15*100;
		double t = w.getResult3()/70*100;
		
		WeightedAverage ans = new WeightedAverage(f,s,t);
		return String.format("The total result is: %g",ans);
		
	
	}

}

HERES THE ERROR:


found : java.lang.String
required: java.lang.Double
return String.format("The answer is: %g",ans);
^
1 error

[Jeff Verdegan]

Hi, and welcome to the Ranch! A couple of things that will help you get the most out of your experience here:

1) UseCodeTags(←click) when posting code so it will be readable. I've added them for you this time.

2) TellTheDetails(←click). Copy/paste the exact, complete error message and indicate clearly which line is causing it.

[Paul Witten]

Tommy Cregan wrote:
public static Double calcOverallMark(WeightedAverage w){

double f = w.getResult1()/15*100;
double s = w.getResult2()/15*100;
double t = w.getResult3()/70*100;

WeightedAverage ans = new WeightedAverage(f,s,t);
return String.format("The total result is: %g",ans);
}[/code]


HERES THE ERROR:


found : java.lang.String
required: java.lang.Double
return String.format("The answer is: %g",ans);
^

So as the error message says, Tommy: "Required: java.lang.Double". Look at your return type in the method declaration above. It says Double (with a big D). What are you returning?

Another case where the compiler didn't lie!

[Paul Witten]

Paul Witten wrote:

Tommy Cregan wrote:

	public static Double calcOverallMark(WeightedAverage w){
		
		double f = w.getResult1()/15*100;
		double s = w.getResult2()/15*100;
		double t = w.getResult3()/70*100;
		
		WeightedAverage ans = new WeightedAverage(f,s,t);
		return String.format("The total result is: %g",ans);
}

HERES THE ERROR:

found : java.lang.String
required: java.lang.Double
return String.format("The answer is: %g",ans);
^

So as the error message says, Tommy: "Required: java.lang.Double". Look at your return type in the method declaration above. It says Double (with a big D). What are you returning?

Another case where the compiler didn't lie!

[Paul Witten]

Tommy Cregan wrote:

	public static Double calcOverallMark(WeightedAverage w){
		
		double f = w.getResult1()/15*100;
		double s = w.getResult2()/15*100;
		double t = w.getResult3()/70*100;
		
		WeightedAverage ans = new WeightedAverage(f,s,t);
		return String.format("The total result is: %g",ans);
}

HERES THE ERROR:

found : java.lang.String
required: java.lang.Double
return String.format("The answer is: %g",ans);
^

So as the error message says, Tommy: "Required: java.lang.Double". Look at your return type in the method declaration above. It says Double (with a big D). What are you returning?

Another case where the compiler didn't lie!