Java array assignment

chocolate boy123

Hi for my assignment I need to make a 10 value array to take input as marks. I must then call a method to calculate average and then call another method to give a point. The points work like this... If the average is between 90-100 you get 4 point if average is between 80-89 you get 3 pints etc... I'll post my code I think I almost have it complete can someone explain wjere I'm going wrong thanks

chocolate boy123

here is my code...

import javax.swing.JOptionPane;

public class practical19 {


public static void main(String[] args) {
// TODO Auto-generated method stub

double array1;

double array2;

double resultsArray [] = new double [10];

for (int i=0; i<10; i++){

resultsArray = Double.parseDouble(JOptionPane.showInputDialog("Enter each grade"));
}

double method1 = averageGrade(array1);

double method2 = qualityPoints (array2);

String output = "Student score " + average;

output += "Point is " + answer;

JOptionPane.showMessageDialog(null, output, "Results",
JOptionPane.INFORMATION_MESSAGE);


}
public static double averageGrade (double array1 []){
double sum =0;

double average = 0;

for (int j=0; j <array1.length; j++){

sum = sum + array1 [j];

average = sum / array1.length;

}
return average;
}


public static double qualityPoints (double array2 []){

double average;

for (int k= 0; k < array2.length; k++){

if (average <=100 && average > 90){

double answer = 4;
}
else if (average <=89 && average >=80){

double answer = 3;
}
else if (average <=79 && average >=70){

double answer = 2;
}
else if (average <=69 && average >=60){

double answer = 1;
}
else {
double answer = 0;
}
}
return answer;
}
}

mightyreds

I won't be able to test the code till later what seems to be the problem with it

mightyreds

well for starters you never initialize your arrays properly

double[] array1 = new double[10];

double[] array2 = new double[10]

then I presume you left method1 and method2 in by mistake here

double average = averageGrade(array1);

double answer = qualityPoints (array2);

String output = "Student score " + average;

output += "Point is " + answer;

you may look up scope for this method

public static double qualityPoints (double array2 []){

		double average = 0;
		double answer = 0;

		for (int k= 0; k < array2.length; k++){

			if (average <=100 && average > 90){

				answer = 4;
			}
			else if (average <=89 && average >=80){

				answer = 3;
			}
			else if (average <=79 && average >=70){

				answer = 2;
			}
			else if (average <=69 && average >=60){

				answer = 1;
			}
			else { 
				answer = 0;
			}
		}
		return answer;
	}
}

mightyreds

its still not working right but your most of the way there as far as i can see, I would look at your arrays, you create 2 and do nothing with them then call methods on them

chocolate boy123

Thank you for your input !