Help with JAVA Programming! 1. Find the maximum value in a 2D array 3 3 4 5 7 12

Question

Help with JAVA Programming!

1. Find the maximum value in a 2D array

3 3 4

5 7 12

3 2 6

Answer: 12

2. Given:

int[][] items =

{ {0, 1, 3, 4},

    {4, 3, 99, 0, 7 },

    {3, 2} } ;

Print all the numbers in the matrix

3. Find the average of all values in a 2D array

4. Write a program that reads students' quizzes scores from a static array. Find the average of all the student’s quiz scores

5. Write a program that reads students' quizzes scores from a user populated Dynamic array, drop the lowest quiz grade for the whole class and compute the new average. The user must first input the scores and then type -1 to let the program know that the user is done typing in scores.

6. Write a program that reads students' quizzes scores from a User populated arraylist. The user must first input the scores and then type -1 to let the program know that the user is done typing in scores. Find how many students there are and separate the students quiz scores into 2 arrays. Low scores and high scores, where half the class with the lower scores is put into low scores and high scores where the other half is put here.

Explanation / Answer

1.

import java.util.*;

class Max
{
public static void main (String[] args)
{
  int arr[][] = {{3,3,4},{5,7,12},{3,2,6}};
  
  int max = 0;// assign mimimum value to max
  for(int i=0;i<3;i++)
  {
   for(int j=0;j<3;j++)
   {
    if(arr[i][j] > max)// if any element of array is greater tham max
    max = arr[i][j];// assign that element to max
    
   }
   
  }
  System.out.println("Maximum value in arr : "+max);
}
}

Output:

Maximum value in arr : 12
2.

class Print
{
public static void main (String[] args)
{
   int[][] items = { {0,1,3,4},{4,3,99,0,7},{3,2} } ;
  
  
  
   for(int i=0;i<items.length;i++)// number of rows
   {
    for(int j=0;j<items[i].length;j++)// number of columns
    {
    System.out.print(items[i][j]+" ");
    }
   System.out.println();
   }
    
   
}
}

Output:

0 1 3 4
4 3 99 0 7
3 2

3.

import java.util.*;

class Average
{
public static void main (String[] args)
{
  double sum =0;
  Scanner input = new Scanner(System.in);
  System.out.println("Enter the number of rows : ");
  int rows = input.nextInt();
  System.out.println("Enter the number of columns : ");
  int cols = input.nextInt();
  
   int[][] arr = new int[rows][cols];
  
  
  //input elements of 2D array
   for(int i=0;i<rows;i++)
   {
    for(int j=0;j<cols;j++)
    {
    arr[i][j] = input.nextInt();
    }
   
   }
  //sum of all elements of array
   for(int i=0;i<rows;i++)
   {
    for(int j=0;j<cols;j++)
    {
    sum = sum +arr[i][j];
    }
   
   }
    
  System.out.println("Average of all elements of array : "+sum/(rows*cols));
}
}

Output:

Enter the number of rows :2
Enter the number of columns :3

2 4
5 6
8 1
Average of all elements of array : 4.333333333333333

4.

class QuizScoreAverage
{
public static void main (String[] args)
{
  double sum =0;
  
   double[] quizScore = {5.6,7.8,4.8,6,4,4.9};//static array
  
  

  //sum of all Scores of array
   for(int i=0;i<quizScore.length;i++)
    sum = sum +quizScore[i];
   
    
  System.out.printf("Average score : %.2f",sum/quizScore.length);
}
}

Output:

Average score : 5.52

5.

import java.util.*;

class QuizScoreAverage
{
public static void main (String[] args)
{
  double sum =0;
  Scanner input = new Scanner(System.in);
  System.out.println("Enter the scores of students<1-10> -1 to end: ");
   double[] quizScore = new double[20];
  
   int i =0;
  do
  {
  quizScore[i] = input.nextDouble();
  
  if(quizScore[i] == -1)
  break;
  i++;
  }while(quizScore[i] != -1);
  
  int n = i;
  double min = 10;
  
  for( i=0;i<n;i++)
  {
   if(quizScore[i] < min)
   min = quizScore[i];
  }
  
  //sum of all Scores of array after removing min
   for( i=0;i<quizScore.length;i++)
    sum = sum +quizScore[i];
   
    sum = sum -min;
  System.out.printf("Average score after removing min : %.2f",sum/(n-1));
}
}

Output:

Enter the scores of students<1-10> -1 to end:

5.6
7.8
9.1
4.9
6.6
-1

Average score after removing min : 7.03

6.

import java.util.*;

class QuizScoreAverage
{
public static void main (String[] args)
{
  double score,sum =0;
  Scanner input = new Scanner(System.in);
  
  //3 arraylists of all quiz scores,low scores and high scores
   ArrayList<Double> quizScore = new ArrayList<Double>();
    ArrayList<Double> lowScore = new ArrayList<Double>();
     ArrayList<Double>highScore = new ArrayList<Double>();
    
     System.out.println("Enter the scores of students<1-10> -1 to end: ");
   int i =0;
  do
  {
  score = input.nextDouble();
  
  if(score == -1)
  break;
  
  quizScore.add(score);
  i++;
  }while(score != -1);
  
  
  
  System.out.println("Number of students : "+i);
  
  double avg = 0;
  //compute average acore
  for(double scores: quizScore)
  {
   avg = avg+ scores;
  }
  avg = avg/quizScore.size();
  
  //make two separate lists of higher and lower scores
  for(double scores: quizScore)
  {
   if(scores > avg)
   highScore.add(scores);
   else
   lowScore.add(scores);
  }
  
  //print higher and lower scores lists
  System.out.println("Students with higher scores : ");
  for(double scores: highScore)
  {
   System.out.println(scores+ " ");
   
  }
  
  System.out.println("Students with lower scores : ");
  for(double scores: lowScore)
  {
   System.out.println(scores+ " ");
   
  }
}
}

output:

Enter the scores of students<1-10> -1 to end:

5.6
7.8
9.1
7.9
6.6
5.8
-1

Number of students : 6
Students with higher scores :
7.8
9.1
7.9
Students with lower scores :
5.6
6.6
5.8

Do ask if any doubt. Please upvote.

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