Question

For this assignment you are to create two programming projects. The first should have a project directory with Lab02-2WriteNumbers and the second should have a project directory with Lab02-2ReadNumbers.

Lab02-03WriteNumbers – Write a program that asks the user to enter five numbers. Use a double data type to hold the numbers. The program should create a file and save all five numbers to the file.

Enter a number (1 of 5): 45

Enter a number (2 0f 5): 23

Enter a number (3 0f 5): 78

Enter a number (4 0f 5): 111

Enter a number (5 0f 5): 27

done

Lab02-03ReadNumbers – Write a program that opens the file created in Lab02-2WriteNumbers, reads the five numbers and displays them. The program should also calculate and display the sum of all the numbers.

//oops I used a different numbers.txt… oh well… you get the idea…

34

111

456

3

67

The total of all the numbers is 671

done

I have the first part done. Just need the second part.

Answer 1

WriteNumbers.java

import java.util.*;
import java.io.*;

class WriteNumbers
{
public static void main(String args[])
{
double arr[]=new double[5];
int i;

try
{
Scanner sc=new Scanner(System.in);
FileWriter fw=new FileWriter("Numbers.txt");
System.out.println("\n");

for(i=0;i<=4;i++)
{
System.out.print("Enter a number "+"("+(i+1)+" of 5) :");
arr[i]=sc.nextDouble();
}

for(i=0;i<=4;i++)
{
fw.write(arr[i]+"\n");
}

fw.close();
System.out.println("Numbers stored successfully!!\n");
}
catch(Exception e1)
{
System.out.println("Exception is "+e1);
}
}
}

ReadNumbers.java

import java.io.*;

class ReadNumbers
{
public static void main(String args[])
{
try
{
FileReader fr=new FileReader("Numbers.txt");
int i;
String numbers="";
System.out.println("\n");
while((i=fr.read())!=-1)
{
System.out.print((char)i);
numbers=numbers+(char)i;
}

String[] nums=numbers.split("\n");

double total=0;

for(int k=0;k<=4;k++)
{
total=total+Double.parseDouble(nums[k]);
}

System.out.println("The total of all the numbers is "+total);
System.out.println("\n");
fr.close();
}
catch(Exception e1)
{
System.out.println("Exception is "+e1);
}
}
}