Write a program in Java which asks the user to enter a binary #. -It validates t
ID: 3861723 • Letter: W
Question
Write a program in Java which asks the user to enter a binary #.
-It validates the entry as a binary number, only a binary number is allowed.
-the program converts and displays the binary number to its base 10 equivalent
-the user must be asked if they want to continue entering numbers or quit
-keeps a record in a txt file named outDataFile.txt with the history of all numbers entered and the associated results in the following format:
You entered 111 Its base 10 equivalent is 7 You entered 1010101 Its base 10 equivalent is 85
Restrictions: No infinite loops, or break statements to exit loops.
Explanation / Answer
code.java
import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.io.*;
import java.util.Scanner;
public class code {
private static final String FILENAME = "outDataFile.txt";
public static void main(String[] args) {
try
{
BufferedWriter bw = null;
FileWriter fw = null;
fw = new FileWriter(FILENAME);
bw = new BufferedWriter(fw);
while(true)
{
String n;
Scanner scanner = new Scanner(System.in);
System.out.println("Enter Binary number: ");
n = scanner.next();
int dec = 0;
int i = 0;
int j = n.length() - 1;
boolean flag = true;
while(j >= 0)
{
if(n.charAt(j) != '1' && n.charAt(j) != '0')
{
flag = false;
}
j--;
}
if(flag == true)
{
j = n.length() - 1;
while(j >= 0)
{
int r = (Integer.parseInt(String.valueOf(n.charAt(j))));
dec = dec + r*(int)(Math.pow(2,i));
i++;
j--;
}
fw.write("You entered " + n + " Its base 10 equivalent is " + dec );
fw.write(" ");
}
else
{
System.out.println("Not a binary number!");
}
System.out.println("Enter 1 to continue and 2 to exit");
int c = scanner.nextInt();
if(c == 2)
{
fw.close();
System.exit(0);
}
}
}
catch (IOException e)
{
e.printStackTrace();
}
}
}
Sample input:
Enter Binary number:
11
Enter 1 to continue and 2 to exit
1
Enter Binary number:
111
Enter 1 to continue and 2 to exit
1
Enter Binary number:
1111
Enter 1 to continue and 2 to exit
1
Enter Binary number:
1010
Enter 1 to continue and 2 to exit
1
Enter Binary number:
11111
Enter 1 to continue and 2 to exit
2
Sample outDataFile.txt :
You entered 11 Its base 10 equivalent is 3
You entered 111 Its base 10 equivalent is 7
You entered 1111 Its base 10 equivalent is 15
You entered 1010 Its base 10 equivalent is 10
You entered 11111 Its base 10 equivalent is 31