Question

Hi guys basically im new to Java started in oct, im doing ComScience. I need help please with the following would be greatly appreciated.

NOTE: I have not really laid the code out yet so to speak i wanted to get the program to work first before structuring/comments etc . UULIB is name of the University librays.

OBJECTIVE: Find the NAME of students who have below AVERAGE mark.

This is the code i used below to try and find it but it skips the first [0] array number and gives me one name only.

import uulib.*;

public class Q3
{
    public static void main(String[] args)
    {
        int class_number = Console.getInt("Enter how many students between 1-10");

        while (class_number < 1 || class_number > 10)
            class_number = Console.getInt("Enter how many students between 1-10");

        System.out.println("");

        String[] name = new String[class_number];
        int[] score = new int[name.length];

        for (int i=0; i<class_number; i=i+1)
        {
            name[i] = Console.getString("Enter Name");
            score[i] = Console.getInt("Enter score");

            if ( score[i] < average(score))
                System.out.print(name[i] + " ");
        }

        System.out.println(" ");
        System.out.println("Average mark = " + Num.format(average(score), 1 ));
        System.out.println("Lowset mark = " +lowset(score) );
        System.out.println("Highest mark = " +highestValue(score) );
        System.out.println("Name of students with highest mark =  " );
    }

    public static double average(int[] nums)
    {
        double total = 0;

        for (int i=0; i<nums.length; i=i+1)
        {
            total = total + nums[i];
        }
        return total / nums.length;
    }

    public static int lowset(int[] nums)
    {
        int minimum = nums[0]; //sets the first to be the smallest

        for (int i = 0; i < nums.length; i++) //goes through your array
        {
             if (nums[i] < minimum) //checks and replaces if necessary
             {
                 minimum = nums[i];   
             }
        }
        return minimum;
    }

    private static int highestValue(int[] numbers) 
    {
        int highest = numbers[0];
        for (int i = 0; i < numbers.length; i++) 
        {
            if (numbers[i] > highest) 
            {
                highest = numbers[i];
            }
        }
        return highest;
    }
}

Answer 1

You should split your for-loop into two for-loops as you can’t compute the average before having collected all scores:

for (int i=0; i<class_number; i=i+1) {
    name[i] = Console.getString("Enter Name");
    score[i] = Console.getInt("Enter score");
}
for (int i=0; i < class_number; i++) {
    if (score[i] < average(score))
        System.out.print(name[i] + " ");
}