Von neuman loves binary problem

#1

Given a binary number ,help Von Neuman to find out its decimal representation. For eg 000111 in binary is 7 in decimal.
NOT ABLE TO SOLVE

#2

Hi

What problem are you facing in this question? Is your program not running correctly or you have problem understanding the logic?

The question simply says that you will be given a number in binary form and you need to convert it in decimal form.

#3

Hi
As you are not responding to this thread, I am marking your doubt as Resolved for now. Re-open it if required.

Please mark your doubts as resolved in your course’s “ Ask Doubt ” section, when your doubt is resolved.

#4

I am not able to frame the logic

#5

srry i didnt knew that i need to come in the discussion forum thats why couldnt reply early.

#6

Hi

The logic for the question is:

For binary number 110010 , Decimal number = 1.2^5 + 1.2^4 + 0.2^3 + ……+ 0.2^0.

  1. The idea is to extract the digits of given binary number starting from right most digit and keep a variable dec_value.
  2. At the time of extracting digits from the binary number, multiply the digit with the proper base (Power of 2) and add it to the variable dec_value.
  3. In the end, the variable dec_value will store the required decimal number.

Hope it helps.

#7

yaa that i know but my doubt is that user can enter 0-9 any number how to ensure it accepts only 0 and 1. Do i need to apply if-else loop
?

#8

Assume that there are numbers only with digits 0 and 1 and write your code. There are no test cases at the backend with digits other than 0 and 1.

#9

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

Scanner scn =new Scanner(System.in);

int number=scn.nextInt();
for(int i=1;i<=number;i++)

{
	Scanner scan =new Scanner(System.in);
	
	int n=scan.nextInt();
	int x=0;
	int y=0;
	int val=1;

//
while(n/10!=0||n%10!=0)
{
x=n%10;
n=n/10;
y=y+x*val;

		val=val*2;
	}
	
	System.out.println(y);	
}

}
}
This is my code
im getting error like this
Exception in thread “main” java.util.NoSuchElementException
at java.util.Scanner.throwFor(Scanner.java:862)
at java.util.Scanner.next(Scanner.java:1485)
at java.util.Scanner.nextInt(Scanner.java:2117)
at java.util.Scanner.nextInt(Scanner.java:2076)
at Main.main(Main.java:7)

How to slove this?