CODEWITHSUNDEEP
javaarraysmethodsaverage
Ernesto Mori
Ernesto Mori

Reputation: 13

Class Average Methods, and array

This is the prompt that I'm asked to follow.

Write a method called average that takes in an array of test grades and returns the letter grade of the class average. The grade ranges are as follows:

Use the following method header: public static char average(int[] grades)

This is the output example I'm supposed to follow.

How many grades do you want to enter? 10

Enter grade 1: 70 Enter grade 2: 87 Enter grade 3: 95 Enter grade 4: 80 Enter grade 5: 80 Enter grade 6: 78 Enter grade 7: 85 Enter grade 8: 90 Enter grade 9: 66 Enter grade 10: 89

The class average for the test is: B

This is what I have so far but I don't know how to include the method header stated above. public static char average(int[] grades)

import java.util.Scanner;
public class ClassAverage{
    //Main Method
    public static void main(String[] args){

        //Variables
        char average;                                                       
        int i;                                                              
        int sum = 0;                                                        
        int b;                                                                                              

        Scanner scan = new Scanner(System.in);                              
        System.out.print("How many grades do you want to enter: ");
        int grades = scan.nextInt();                                                
        int array[] = new int[grades];                                          

        for(i = 0;i < grades; i++){                                             
            System.out.print("Enter grade " + (i + 1) + ": ");
            array[i] = scan.nextInt(); 
            sum = sum + array[i];
        }
        b = sum / array.length;

        if(b >= 90)                                                         
            average = 'A';
        else if(b <= 90 && b >= 80)
            average = 'B';
        else if(b <= 80 && b >= 70)
            average = 'C';
        else if(b <= 70 && b >= 60)
            average = 'D';
        else if(b <= 60)
            average = 'F';
        else
            average = '?';
        System.out.println("The class average for the test is: " + average);            
        }
}

Upvotes: 1

Views: 1441

Answers (5)

Maurice Perry
Maurice Perry

Reputation: 9650

Another solution:

package test163;

import java.util.Scanner;

public class ClassAverage {

    //Main Method
    public static void main(String[] args) {

        //Variables
        char average;
        int i;
        int b;

        Scanner scan = new Scanner(System.in);
        System.out.print("How many grades do you want to enter: ");
        int grades = scan.nextInt();
        int array[] = new int[grades];

        for (i = 0; i < grades; i++) {
            System.out.print("Enter grade " + (i + 1) + ": ");
            array[i] = scan.nextInt();
        }
        average = average(array);
        System.out.println("The class average for the test is: " + average);
    }

    public static char average(int[] grades) {
        int sum = 0;
        for (int grade: grades) {
            sum += grade;
        }
        int b = sum / grades.length;

        if (b >= 90) {
            return 'A';
        } else if (b >= 80) {
            return 'B';
        } else if (b >= 70) {
            return 'C';
        } else if (b >= 60) {
            return 'D';
        } else {
            return 'F';
        }
    }
}

Upvotes: 0

Randika Wanninayaka
Randika Wanninayaka

Reputation: 171

It is very simple code. My answer is 

import java.util.Scanner;


public class AverageMethod {
    public static void main(String[] args) {
       char average;                                                       
        int i;                                                              
        int sum = 0;                                                        
        int b;                                                                                              

        Scanner scan = new Scanner(System.in);                              
        System.out.print("How many grades do you want to enter: ");
        int grades = scan.nextInt();                                                
        int array[] = new int[grades];                                          

        for(i = 0;i < grades; i++){                                             
            System.out.print("Enter grade " + (i + 1) + ": ");
            array[i] = scan.nextInt(); 
            sum = sum + array[i];
        }
        b = sum / array.length;

        if(b<=100 && b>=0){

            if(b<=100 && b >= 90)                                                         
                average = 'A';
            else if(b >= 80)
                average = 'B';
            else if(b >= 70)
                average = 'C';
            else if(b >= 60)
                average = 'D';
            else
                average = 'F';
            System.out.println("The class average for the test is: " + average); 
        }else{
            System.out.println("Not in range");
        }


    }

}

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Upvotes: 0

Mihai Chelaru
Mihai Chelaru

Reputation: 8187

I've written some pseudocode to help you take the code you have now and encapsulate it in the method you are requesting.

You already have the pieces written, you just need to move them from your main method to this new average method and make any necessary changes that come with changing scope (declaring or renaming certain variables in the new method).

Then to get the desired output you can call the method from within main by using average(gradeArray) and using the char value returned in a print statement.

public static char average(int[] gradeArray) {

    // Find the sum of grades in gradeArray

    // Use this sum and the size of the array to compute the average

    // Use logic to determine which letter grade to print out based on the average

    // Return the average
}

Upvotes: 0

Vyshak
Vyshak

Reputation: 136

public class MainClass {

//Main Method
public static void main(String[] args) {

    //Variables
    char avg;
    int i;

    Scanner scan = new Scanner(System.in);
    System.out.print("How many grades do you want to enter: ");
    int grades = scan.nextInt();
    int array[] = new int[grades];

    for (i = 0; i < grades; i++) {
        System.out.print("Enter grade " + (i + 1) + ": ");
        array[i] = scan.nextInt();
    }


    avg = average(array);
    System.out.println("The class average for the test is: " + avg);
}

private static char average(int[] array) {
    final int sum = Arrays.stream(array).sum();
    final int b = sum / array.length;

    if (b >= 90) {
        return 'A';
    } else if (b <= 90 && b >= 80) {
        return 'B';
    } else if (b <= 80 && b >= 70) {
        return 'C';
    } else if (b <= 70 && b >= 60) {
        return 'D';
    } else if (b <= 60) {
        return 'F';
    } else {
        return '?';
    }

} }

See that i accepted all the marks into an array and passed that int array into a method where i calculated the sum and grade and returned grade

Upvotes: 1

Glen Pierce
Glen Pierce

Reputation: 4811

Your instructor wants you to create a method called average that could be called from within main.

Essentially, all you need to do to complete the assignment is wrap your code inside of that method. So main would call average having passed in the ints to it.

Upvotes: 0

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