Question

ABOVE AVERAGE 40 Input Standard input Output Standard output Topic Array & Array Processing Problem Description Understanding how to interpret test scores is a valuable skill for every teacher. That's because test score interpretation enables teachers to understand how their students' performance for each tests of the course. Average test score is one of the indicators to determine the class performance for the test. For each test, we need to calculate the average score and determine the percentage of students whose score is more than the average score. Input First line of input is an integer N (I <N<100) that represents the number of test case, followed by N test cases. For each test case there will be a set of integers x (0<x< 100) that represent the student's mark for the test, which ends with - 1. Maximum number of students in the class is 100. There might be cases where some of the students did not take the test, hence the number of marks in the test case may be less than the maximum number of students. Output For each test case, the output contains a line in the format "Case #x: A PS", where x is the case number (starting from 1) and A represent the average mark for the test and M is the percentage of student above the average mark. Note: A and P is rounded to the nearest integer value using Math.round(double a); Sample Input Output Sample Input Sample Output Case #1: 53 40% 34 87 48 45 70 12 10 100 45 80 -1 Case #2: 46 42 28 11 62 43 78 1 36 81 70 31 37 71 -1 2

Java code

Answer 1

Hello!

Declaration of array in java

Arrays are the objects in the Java , array stores number of single type data in contagious manner

type_name variable_name []

EX: int test[];

Allocating memory to array

var_name = new type[SIZE]

Ex: test = new int[50]

// initializing array

var_name = new type[]{d1,d2,d3}

Ex: test = new int[]{1,2 ,5}

// accesing array elements

Basically array index strarts from 0

so test = new int[]{1,2,3}

test[0] is 1

test[1] is 2

test[2] is 3

LOGIC:

• Declare int array of test 100x100 elements to store 100 tests marks each of 100 students
• Declare the int array of 100 to store number of students for the test
• Double array of avg and percent each of 100 elements to store avg and percentage of students scored above average of the test
• Ask the user for number of tests
• Each test gets marks of students till any of the marks entered is -1
• Calculates the average of the test
• Calculates the percentage of the students who scored more the avg marks
• Displays the avg of the test and percentage of test

CODE:

import java.util.Scanner;
class ArrayProcessing
{
   public static void main(String args[])
  {
    // test is 100 rows 100 colums array stores 100 test marks of 100 students each
    int test[][]=new int[100][100];
    // count stores number of students in the test
    int count[] = new int[100];
    // average stores average of all the tests 
    double avg[] = new double[100];
    // stores the percentage of students who scores above average
    double percent[] = new double[100];
    // total , avg count are temporary varibales
    int total,avgCount;
    Scanner sc=new Scanner(System.in);
    // asks the user to enter the number of test cases
    System.out.println("Enter the number of Test cases: ");
    int N=sc.nextInt();
    // for loop for number of tests 
    for(int i=0;i<N;i++)
    {
      // ask the user to enter marks of test i
      System.out.println("Enter the array elements for case: "+(i+1));
      // initially total of test i is 0
      total = 0;
      // initially number of marks in the test is 0
      count[i] = 0;
      // for loop for each marks in the i th test
      for(int j=0;j<100;j++)
      {
        // gets the j th  marks of ith test 
        int k=sc.nextInt();
        // if enter marks is -1 the breaks the for loop
        if(k == -1)
        break;
        // if not then stores the marks in the test
        test[i][j]=k;
        // adds the entered marks to total
        total +=k;
        // counts the number of marks entered 
        count[i]++;
      }
      // calculates the average of the i th test
      avg[i] = total/count[i];
      avgCount = 0;
      // iterates over each marks in i th test and if marks > avg marks
      // then increments the avgCount 
      for(int k=0;k<count[i];k++)
        if(test[i][k] >= avg[i])
          avgCount++;
      // calculates the percentage of the students having more than average
      percent[i] = (avgCount*100/count[i]);
    }
    for(int i=0;i<N;i++)
    // displays the avg of the test i and percentage
    System.out.println("case #"+(i+1) + ": " + Math.round(avg[i]) + " " + Math.round(percent[i])+"%");
  }
}

OUTPUT:

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