Grades average program! [Urgent]

[Hitman]

I am very beginner and trying to do my class homework. An assignment is to input 10 grades, remove the biggest and the lowest (to avoid cheating) and then calculate an average. Pleazzze, help!!!!

[Denis]

Did you give it a try?

[Hitman]

Yes. What I done yet:

Code:

import java.util.Scanner;

public class GradesProgram {
public static void main(String[] args) {
Scanner kb = new Scanner(System.in);
int[] grades = new int[10];
int i;
System.out.println("Enter 10 grades: ");
for (i = 0; i < 10; i++) {
grades[i] = kb.nextInt();
}
int sum = 0;
for (i = 0; i < 10; i++) {
sum = sum + grades[i];
}
double av = sum / 10;
System.out.print("Average is " + av);
}
}

But how to remove minimum and maximum grades?

[Denis]

Good attempt. All you should do is to track minimum and maximum grades, while looping and discard them then. Also, (sum / 10) returns an integer result, while you probably need double one. The code:

Code:

import java.util.Scanner;

public class GradesProgram {
public static void main(String[] args) {
Scanner kb = new Scanner(System.in);
int[] grades = new int[10];
int i;
System.out.println("Enter 10 grades: ");
for (i = 0; i < 10; i++) {
grades[i] = kb.nextInt();
}
int sum = 0;
int min = 100;
int max = -100;
for (i = 0; i < 10; i++) {
sum = sum + grades[i];
if (grades[i] < min)
min = grades[i];
if (grades[i] > max)
max = grades[i];
}
sum -= min;
sum -= max;
double av = (double)sum / 8;
System.out.print("Average is " + av);
}
}

Also, using an array in this program is not necessary. You can sum grades and track extreme values in the input loop:

Code:

import java.util.Scanner;

public class GradesProgram {
public static void main(String[] args) {
Scanner kb = new Scanner(System.in);
int grade;
int i;
int sum = 0;
int min = 100;
int max = -100;
System.out.println("Enter 10 grades: ");
for (i = 0; i < 10; i++) {
grade = kb.nextInt();
sum = sum + grade;
if (grade < min)
min = grade;
if (grade > max)
max = grade;
}
sum -= min;
sum -= max;
double av = (double)sum / 8;
System.out.print("Average is " + av);
}
}

Hope it helps.

[Hitman]

It works well. Thanx!

[Algolist.net Editor]

Topic has been split, last post by zaini can be found at iterative, stack based method [Urgent]