# java problem

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java problem
Posted in : Java Beginners
a) Binary numbers is important in computers. Binary number system uses only two digits, 0
and 1. There are pre-defined methods available in Java that will allow us to convert from
denary integer (base 10) to binary integer (base 2). The method is:
Integer.toBinaryString(int)
So to convert the denary integer 12, you invoke the method by passing the integer 12 as
parameter:
Integer.toBinaryString(12),
and the result returned is the binary equivalent of denary 10 as string ? ?1100?.
In this question, you are to write a program that prompt user to enter a denary integer, and
convert and display the integer in its binary equivalent. You are to write your own logic
of conversion without using the pre-defined method. If you want, you may write a method
that will accept an integer parameter, and return the binary equivalent as string, similar to
the pre-defined method.
b) Enhanced your question in (a) by including a method toHexa that will accept a denary
integer and return the hexadecimal equivalent of the integer as string. There are 16
symbols used in hexadecimal (base 16), they are digits 0 to 9, a (for 10), b (for 11), c (for
12), d (for 13), e (for 14), and f (for 15). Again you have to write your own conversion
logic, and not used the pre-defined Integer.toHexaString method

March 20, 2010 at 4:47 PM

Hi Friend,

To convert integer to binary, try the following code:

import java.util.*;
class ConvertIntToBinary{

static void convert(int num){
if ( num == 0 )
System.out.print ( "0" ) ;
else
{
String bits = "" ;
do
{
bits = ( char ) ( num % 2 + '0' ) + bits ;
num /= 2 ;
}
while ( num > 0 ) ;
System.out.print (bits) ;
}
}
public static void main(String args[]){
Scanner input=new Scanner(System.in);
System.out.print("Enter Number: ");
int bi = input.nextInt();
System.out.print("Its Binary representation is: ");
convert(bi) ;
System.out.println() ;
}

Thanks

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