Write a java program please: Asks the user to enter a binary number Validates th

Question

Write a java program please:

Asks the user to enter a binary number

Validates that the entry is a binary number. Nothing but a binary number should be allowed.

The program converts and displays the binary number to its base 10 equivalent, Example 1112 = 710

The user must be asked if he/she wants 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

How do I do this without exceptions, methods(only main method), and only import.util.Scanner?

Code:

import java.util.Scanner;
public class Binary {
public static void main(String[] args) {

int binary1, bin;
int deci = 0, num = 0;

boolean userChoice = false;
Scanner input = new Scanner(System.in);

//Loop to ask user to input desired binary number
while(!userChoice)
{
System.out.println("Enter a Binary value:");
binary1 = input.nextInt();
  
boolean result = true;
if(result == true)
{
bin = binary1;
  
//Loop converts binary value into the decimal value
do
{
int remain = binary1 % 10;
deci += remain * Math.pow(2, num);
//num = num * 2;
binary1 = binary1 / 10;
num++;
}while(binary1 != 0);
  
System.out.println("You entered " + bin);
System.out.println("Its base 10 equivalent is: " + deci);

}
else
{
  
System.out.println("Binary number was not entered.");
}
  
//Asks if user is still interested in continuing
Scanner input2 = new Scanner(System.in);
System.out.println("Do you wish to continue?(yes or no): ");
String response = input2.nextLine();
if(response.equals("no"))
{
userChoice = true;
}
}
}
}

You entered 111

Its base 10 equivalent is 7

You entered 1010101

Its base 10 equivalent is 85

Explanation / Answer

Hi,

I have fixed the issue and highlighted the code changes below.

Binary.java

import java.util.Scanner;

public class Binary {

public static void main(String[] args) {

int binary1, bin;

int deci = 0, num = 0;

boolean userChoice = false;

Scanner input = new Scanner(System.in);

//Loop to ask user to input desired binary number

while(!userChoice)

{

deci = 0;

num = 0;

System.out.println("Enter a Binary value:");

binary1 = input.nextInt();

boolean result = true;

if(result == true)

{

bin = binary1;

//Loop converts binary value into the decimal value

do

{

int remain = binary1 % 10;

deci += remain * Math.pow(2, num);

//num = num * 2;

binary1 = binary1 / 10;

num++;

}while(binary1 != 0);

System.out.println("You entered " + bin);

System.out.println("Its base 10 equivalent is: " + deci);

}

else

{

System.out.println("Binary number was not entered.");

}

//Asks if user is still interested in continuing

Scanner input2 = new Scanner(System.in);

System.out.println("Do you wish to continue?(yes or no): ");

String response = input2.nextLine();

if(response.equals("no"))

{

userChoice = true;

}

}

}

}

Output:

Enter a Binary value:
111
You entered 111
Its base 10 equivalent is: 7
Do you wish to continue?(yes or no):
yes
Enter a Binary value:
1010101
You entered 1010101
Its base 10 equivalent is: 85
Do you wish to continue?(yes or no):
yes
Enter a Binary value:
111111
You entered 111111
Its base 10 equivalent is: 63
Do you wish to continue?(yes or no):
no

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