Question

Calculate the average of a set of grades and count

Answer 1

Answer:

// Scanner class is imported so that the program can can user input

import java.util.Scanner;

// class Solution is defined

public class Solution {

//main method which begin program execution is defined

public static void main(String args[]) {

// Scanner object scan is defined to receive input fromkeyboard

Scanner scan = new Scanner(System.in);

// A prompt is display to the user asking for number of grade

System.out.println("How many grade do you want to enter");

// The user input is assigned to numOfGrade

int numOfGrade = scan.nextInt();

// An array of integer called gradeArray is declared

// it has numOfGrade as length

int[] gradeArray = new int[numOfGrade];

// for-loop that prompt the user to enter grade to fill the gradeArray

for(int i = 0; i < numOfGrade; i++){

System.out.println("Enter a grade: ");

int grade = scan.nextInt();

gradeArray[i] = grade;

}

// sun variable is declared and initialized to 0

int sum = 0;

// numOfFail is declared and initialized to 0

int numOfFail = 0;

// for-loop through the gradeArray that add all element

// it also increase the counter for numOfFail if grade is < 70

for(int j = 0; j < gradeArray.length; j++){

sum += gradeArray[j];

if (gradeArray[j] < 70){

numOfFail++;

}

}

// aveargeGrade is calculated

int averageGrade = (sum / numOfGrade);

// numOfFail is displayed to the user

System.out.println("Number of fail is: " + numOfFail);

// the averageGrade is also displayed.

System.out.println("Average grade is: " + averageGrade);

}

}

Explanation:

The code is well commented and written in Java.