Cfrgtkky

This program is supposed to find the maximum, minimum, and average of grades. User inputs int inputGrade and the program displays letter it is. It's supposed to do this how however many students are needed. I'm having trouble writing the method where it finds the max and min. (yes I've talked to my teacher if anyone's wondering...) I pasted the methods below (they don't work). Just like IN GENERAL, does anyone know how to find the maximum and minimum of a set of entered numbers? (not using arrays, lists, or any unusual imports other than scanner) ** note I've updated this a lot...

import java.util.Scanner;

  public class GetLetterGrade

  {

  static int inputGrade; // input grade



   public static void main(String  args)

  {

   Scanner reader = new Scanner(System.in); 





     int classAverage;

     int classMin; // class's minimum grade

     int classMax; // class's maximum grade



     while (inputGrade != -1) // while user is entering grades

  {



       System.out.println("Welcome to the grade calculator. nPlease enter a 

       numeric grade.  After the last student in the class, enter a grade of 

       -1.");

       inputGrade = reader.nextInt();

       letterGrade(inputGrade); // calls letter grade method 

       findMaxAndMin();

        result();

   }



   }

   // find letter grade

   public static String letterGrade(int numGrade)

   {



   String gradeMessage = "";



   {



  if (numGrade >= 96 && numGrade <= 100) // if numeric grade is 96-100 then 

   it's A+

  {

    gradeMessage = "That's an A+.";

    result();

  // DOES THIS FOR GRADES A+ TO F, NOT SHOWN, too much to paste!

  }



  }

  }

     return gradeMessage;

  }



   public static int findCharGrade(int numGrade)

   {

      char letter;

      if (numGrade >= 90 && numGrade <= 100) // A

   {

       letter = 'A';



   }

       else if (numGrade >= 80 && numGrade < 90)  // B

  {

       letter = 'B';

  }

       else if (numGrade >= 70 && numGrade < 80)  // C

  {

       letter = 'C';



  }

       else if (numGrade >= 60 && numGrade < 70) // D

  {

       letter = 'D';

  }

       else if (numGrade < 60) // F

  {

       letter = 'F'; 

  }



  }









   // finds maximum and minimum grades

    public static int findMaxAndMin(int inputGrade)

    {



       int max = Math.max(inputGrade, max);

       int min = Math.min(inputGrade, min);



        if (inputGrade < max)

    {

          inputGrade = max;

          findCharGrade(inputGrade);

    }

       else if (inputGrade > min)

    {

          inputGrade = min;

          findCharGrade(inputGrade);

    }



     }

   public static void calcAverage(int sumOfGrades, int numOfStudents)

   {

   // something goes here



    }







   // finds results

   public static void result()

   {

     int min = findMaxAndMin(inputGrade);

     int max = findMaxAndMin(inputGrade);

     System.out.println("Please enter a numeric grade");

     int inputGrade = reader.nextInt();

     letterGrade(inputGrade);





     if (inputGrade == -1)

  {

    System.out.println("You entered " + numOfStudents + " students. Class 

    Average: " + average + " Class Minimum: " + min + " Class maximum: " + max 

    + " nThanks for using the class grade calculator!");

  }



}

here is a more simplistic way of doing it not using Lists or arrays

    double sum = 0;  // use double so that you do not do integer arithmetic

    int count = 0;

    int min = Integer.MAX_VALUE;  // set to very high value

    int max = Integer.MIN_VALUE;  // set to bery low value



    Scanner scan1  =  new Scanner(System.in);

    System.out.println("enter numbers (-1 to quit");



    while (scan1.hasNextInt()) {

        int i = scan1.nextInt();  // get the number (assuming only int value)

        if (i == -1) break;



        min = Math.min(i, min);

        max = Math.max(i, max);

        sum += i;

        count++;

    }



    if (count > 0) {

        System.out.println("min " + min);

        System.out.println("max " + max);

        System.out.println("avg " + sum / count);

    }

disclaimer

This code will not handle wrong type of input e.g. Strings

edit

If you want the average to be calculated in a separate method you can have a method like

double calcAvg (double sum, int count) {

    return sum / count;

}

this can then be called as

    if (count > 0) {

        System.out.println("min " + min);

        System.out.println("max " + max);

        System.out.println("avg " + calcAvg (sum, count));

    }

You can (and should) divide your problem into the smaller methods.
I'll drop the code, and you read and study it.
I admit I haven't pay to much attention of this simple quest, but still...
Here you are:

import java.util.List;



public class Answer {



    public static void main(String args) {



        //test with some grades (integers)

        Answer answer = new Answer();

        List<Integer> someGrades = List.of(12, 66, 34, 96, 3, 77, 2);

        System.out.println("max = " + answer.findMaxGrade(someGrades));

        System.out.println("min = " + answer.findMinGrade(someGrades));

        System.out.println("avg = " + answer.findAverageGrade(someGrades));



    }



    private int findMaxGrade(List<Integer> grades) {

        int max = Integer.MIN_VALUE;

        for (int grade : grades) {

            if (grade > max) max = grade;

        }

        return max;

    }



    private int findMinGrade(List<Integer> grades) {

        int min = Integer.MAX_VALUE;

        for (int grade : grades) {

            if (grade < min) min = grade;

        }

        return min;

    }



    private double findAverageGrade(List<Integer> grades) {

        double average = 0;

        for (int grade : grades) {

            average += grade;

        }

        return average / grades.size();

    }

}

package example;

import java.util.Scanner;

class Example {

public static void main(String args) {

    Scanner r = new Scanner(System.in);

    int m = 1, total = 0, max = 0, min = 100;

    double avg = 0;

    while (m <= 5) {

        System.out.print("Input marks " + m + " = ");

        int inp = r.nextInt();

        total += inp;

        m++;

        min=min<inp?min:inp;

        max=max<inp?inp:max;





    }

    avg = (double)(total) / 5;

    System.out.println("Total : " + total);

    System.out.println("Max : " + max);

     System.out.println("Min : " + min);

    System.out.println("Average : " + avg);



}

}