Ok, I have an assignment for Adv. comp sci. and I need help. I am assigned to make 'A program that will read integer test scores from the keyboard until a negative value is typed in. The program will drop the lowest score from the total and print the average of the remaining scores.' I have to use looping for this.. I know how to make the syntax for this I'll say, because I don't know how I can take any amount of test score, and drop the lowest score if I don't know how many number's I have and I dont know how to do this. My teacher said something about taking it to another variable and comparing test scores like 'if (low > testscore) {' for example. I am still confused how to do this.. Here is the code I have so far:


import javax.swing.JOptionPane;

public class while 2 {

    public static void main(String[] args) {

        int scores = 0; //scoretemp parsed as int here.
        int temp = 0; //temp var to compare lowest score
        int low = 0; //not sure about this, lowest score variable anyhow.
        for (int i=1;i>0;i++) {
        String scoretemp = JOptionPane.showInputDialog("Enter your test score (-1 to exit):");
        int score = Integer.parseInt(scoretemp);  //scoretemp is converted to an integer
        if (score = -1) { //if -1 is entered then..
         break;        //exit. [this will quit the whole loop.]
        }
        if (score >= 0){ //if test score is equal to 0 or greater than 0...
//actual code here

        }
    }
}
}


no, that was intentional actually

I'm working on my homework right now, so I can't offer much help right now.
The only thing I can think of for handling all the numbers would be to store them to an ArrayList. You should then be able to loop through it and find the cell with the lowest number, then call remove() to drop the element, and then loop through the list again and sum up all the numbers.

no arrays.

fixed:

import javax.swing.JOptionPane;

public class while2 {

    public static void main(String[] args) {

        int temp = 0; //temp var to compare lowest score
        int low = 0; //not sure about this, lowest score variable anyhow. initialization.
        int acc = 0;
        int total = 0; //total.
        boolean fail = false;
        int score = 0;

        if (score < 0) { //if -1 is entered then..
                fail = true;  //Some kind of failure code goes here.
        }
        else{
             String scoretemp = JOptionPane.showInputDialog("Enter your test score (-1 to exit):");
             score = Integer.parseInt(scoretemp);
             low = score; //assignment takes place <--
        }
        while (!fail) {
        String scoretemp = JOptionPane.showInputDialog("Enter your test score (-1 to exit):");
        score = Integer.parseInt(scoretemp);  //scoretemp is converted to an integer
        if (score < 0) { //if -1 is entered then..
                break;
        }
        else{
                        if (score < low) {  //compares 0 to the score :S
                                total += low;
                                low = score;
                        }
                        else{
                               total += score;
                        }
        }
        acc += 1;
    }
    System.out.print(low); //tests low to make sure of correct output
}
}


int sum = 0;
int numScores = 0;
int lowest = 101; //assuming 100 is the highest score possible
while(true){
    String temp = JOptionPane.showInputDialog("Enter test score (negative to exit): ");
    int score = Integer.parseInt(temp);
    if(score < 0)
        break;
    numScores++;
    if(score < lowest)
        lowest = score;
    sum += score;
}
System.out.println("Average: " + ((sum - lowest) / (numScores - 1)));

should work, unless you don't enter any scores, in which case you'll get -101 (if i went through that right).

You can get all your information from those three things. You shouldn't need any loops for this.

you do need one loop... unless you want to write it recursively? just for the challenge:

public static void main(String[] args){
    int[] answers = recursion(0, 101, 0);
    System.out.println("Average: " + ((answers[2] - answers[1]) / (answers[0] - 1)));
}
public static int[] recursion(int numScores, int lowest, int sum){
    String temp = JOptionPane.showInputDialog("Enter test score (negative to exit): ");
    int score = Integer.parseInt(temp);
    if(score < 0)
        return new int[] {numScores, lowest, sum};
    return recursion(numScores + 1, score < lowest ? score : lowest, sum + score);
}

pretty sure the first one works, not sure about the second.

       

Code: [Select]

int sum = 0;
int numScores = 0;
int lowest = 101; //assuming 100 is the highest score possible
while(true){
    String temp = JOptionPane.showInputDialog("Enter test score (negative to exit): ");
    int score = Integer.parseInt(temp);
    if(score < 0)
        break;
    numScores++;
    if(score < lowest)
        lowest = score;
    sum += score;
}
System.out.println("Average: " + ((sum - lowest) / (numScores - 1)));


You may want to try/catch that parseInt, otherwise it could throw a NumberFormatException.

This is even more off-topic, but here's my version.

grades = []
n = lowest = float("inf")   # 'inf' stands for infinity - this actually works.

while n > 0:
    n = float(input("Grade: "))
    if n > 0:
        if n < lowest:
            lowest = n
        grades.append(n)

for i in range(grades.count(lowest)):
    grades.remove(lowest)
   
print("Average = {0}\nLowest =  {1}".format(sum(grades)/len(grades), lowest))

Scout's version was 13 lines long (without empty lines), mine is 11 lines long (without empty lines)  .

Mine also removes any repeated low scores.  If that isn't desired behavior, then you could just remove the 'for' statement and execute 'grades.remove(lowest)' only once.

Hm. Are you allowed to use implementers of List<T> such as ArrayList<T>?
The List<T> interface specifies an add(T) function.
Edit: That's a no. * calcdude needs to read the topic more thoroughly