Question

I have an array of test grades for each student in a class. As an example, for Adam test1=90 test2=92 test3=93, so the average would be 91.67. I would then save this as Array6. Then using that array, I would take 30% of that plus 70% of the final (array5) to make new array courseaverage.

I have tried to implement this in my code below, but it doesn’t work correctly. Could anyone please suggest the problem…

public class Proj5 {
    public static void main (String[] args) {        
        String[] Array1 = {new String ("Adam"),new String ("Smith"),new String ("Jones"),new String ("Becky"),new String ("Taylor")};       
        Integer[] Array2 = {new Integer(90),new Integer(89),new Integer(86),new Integer(76),new Integer(95)};        
        Integer[] Array3 = {new Integer(92),new Integer(79),new Integer(85),new Integer(90),new Integer(87)};
        Integer[] Array4 = {new Integer(93),new Integer(80),new Integer(90),new Integer(87),new Integer(92)};
        Integer[] Array5 = {new Integer(90),new Integer(77),new Integer(86),new Integer(92),new Integer(89)};

        System.out.println("Name Test1 Test2 Test3 Final Average Grade");

        for (int column = 0; column<Array1.length; column++){
            System.out.printf("%s ", Array1[column]);
            System.out.printf("%s   ", Array2[column]);
            System.out.printf("%s    ", Array3[column]);
            System.out.printf("%s    ", Array4[column]);
            System.out.printf("%s  ", Array5[column]);
            System.out.println(); //start new line of output
        }
    }
}

Answer 1

An array does not have a get() method but an ArrayList does so if you change your arrays to ArrayLists then you can use get() to retrieve the value.

If I understand correctly you have an array that holds the names of each student and each student’s grades are held in a seperate array for each student?

String[] students= {"Adam","Smith","Jones"}; 
int[] adamGrades = {90,92,93};
double gradesTotal = 0.00;
for(int i=0; i < adamGrades.length; i++){
  gradesTotal += adamGrades[i];
}
double avg = (gradesTotal/adamGrades.length);
System.out.print(avg);

That would give you the average for “Adam” and you should be able to use that to figure out the rest of your problem.