Question

1. Create an application containing an array that stores 20 prices, such as 2.34, 7.89,1.34, and so on. The application should (1) display the sum of all the prices, (2) display all values less than 5.00, (3) calculate the average of the prices, and (4) display all values that are higher than the calculated average value.
2. Write a program in Java which performs the sort operation. The main method accepts ten numbers in an array and passes that to the method sort. The method sort accepts and sorts the numbers in ascending and descending order. The method display shows the result. You can use integers or floating point numbers.
3. Given the following multidimensional array that contains addressbook entries:

String entry = {{"Florence", "735-1234", "Manila"},{"Joyce", "983-3333", "Quezon City"},{"Becca", "456-3322", ,Manila"}};

Print the following entries on screen in the following format:

Name : Florence

Tel. # : 735-1234

Address : Manila

4. Write a program in Java which stores values in a 2 x 3 matrix mat1. Copy the contents to another matrix mat2, after that calculate the sum and stores the result into another matrix mat3.

Answer 1

1)

Code:

import java.util.*;

class SGF
{
int a;
// calculates Sum of all the prices
void sum(int arr[], int n)
{
int s = 0;
for (int i = 0; i < n; i++)
s = s + arr[i];
System.out.println("Sum of all the prices is: "+s);
}
  // Calculates Prices Less than 5.
void less(int arr[], int n)
{
  
int c=0;
int brr[] = new int[20];
for (int i = 0; i < n; i++)
if(arr[i]<5)
{
brr[c] = arr[i];
c++;
}
System.out.println("Prices Less than 5 are: ");
for (int i = 0; i < c; i++)
{
System.out.println(brr[i]+"\t");   
}
}

// Calculates Average Value of all the prices
void avg(int arr[], int n)
{
int s = 0;
for (int i = 0; i < n; i++)
s = s + arr[i];
a = s/n;
System.out.println("Average Value of all the prices is: "+a);
}
  

// Calculates Prices Higher than Average
void high(int arr[], int n)
{
int c=0;
int brr[] = new int[20];
for (int i = 0; i < n; i++)
if(arr[i]>a)
{
brr[c] = arr[i];
c++;
}
System.out.println("Prices Higher than Average are: ");
for (int i = 0; i < c; i++)
{
System.out.println(brr[i]+"\t");   
}
}
  
// Prints the array
void printArray(int arr[], int n)
{
for (int i=0; i<n; ++i)
System.out.print(arr[i] + " ");
System.out.println();
}
}

public class Main
{
   public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
SGF ob = new SGF();
int arr[] = new int[20];
int n;
System.out.println("Enter Size of Array:");
n = sc.nextInt();
System.out.println("Enter Prices into Array:");
for(int i=0;i<n;i++)
{
arr[i] = sc.nextInt();
}
ob.printArray(arr,n);
ob.sum(arr,n);
ob.less(arr,n);
ob.avg(arr,n);
ob.high(arr,n);
}
}

Note: please refer screen shots for further clarification and we can use float, int etc.. values. In this program I use int values to calculate sum,avg,less than etc...

2)

Sorting:

Code:

import java.util.*;
class BubbleSort
{

// Sorts In Ascending Order
void ascbubbleSort(int arr[], int n)
{
for (int i = 0; i < n; i++)
for (int j = 0; j < n-i-1; j++)
if (arr[j] > arr[j+1])
{
// swap temp and arr[i]
int temp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = temp;
}
}
// Sorts In Descending Order
void descbubbleSort(int arr[], int n)
{
for (int i = 0; i < n; i++)
for (int j = 0; j < n-i-1; j++)
if (arr[j] < arr[j+1])
{
// swap temp and arr[i]
int temp = arr[j];
arr[j] = arr[j+1];
arr[j+1] = temp;
}
}
// Prints Array
void printArray(int arr[], int n)
{
for (int i=0; i<n; ++i)
System.out.print(arr[i] + " ");
System.out.println();
}
}

public class Main
{
   public static void main(String args[])
{
Scanner sc = new Scanner(System.in);
BubbleSort ob = new BubbleSort();
int arr[] = new int[10];
int n;
System.out.println("Enter Size of Array:");
n = sc.nextInt();
System.out.println("Enter Elements into Array:");
for(int i=0;i<n;i++)
{
arr[i] = sc.nextInt();
}
ob.ascbubbleSort(arr,n);
System.out.println("Sorted array in Ascending Order:");
ob.printArray(arr,n);

ob.descbubbleSort(arr,n);
System.out.println("Sorted array in Descending Order:");
ob.printArray(arr,n);
}
}

3)

Matrix Problem

Code:

import java.util.*;
public class Main
{
   public static void main(String[] args) {
  
   Scanner sc = new Scanner(System.in);
   int a[][]=new int[2][3];
int b[][]=new int[2][3];
  
System.out.println("Enter Elements for 2 * 3 matrix:");
for(int i=0;i<2;i++)
{
for(int j=0;j<3;j++)
{
a[i][j]=sc.nextInt();
}
}
  
//Copies Elements from One Matrix To Another matrix
for(int i=0;i<2;i++)
{
for(int j=0;j<3;j++)
{
b[i][j]=a[i][j];
}
}
  
//creating another matrix to store the sum of two matrices
int c[][]=new int[2][3]; //2 rows and 3 columns
  
//adding and printing addition of 2 matrices
System.out.println("Addition of Two matrices are:");
for(int i=0;i<2;i++)
{
for(int j=0;j<3;j++)
{
c[i][j]=a[i][j]+b[i][j];
System.out.print(c[i][j]+" ");
}
System.out.println();//new line
}
   }
}