Please explain if the following code is actually correct. If the following code
ID: 3781128 • Letter: P
Question
Please explain if the following code is actually correct. If the following code correct, please explain why the code works and is also correct.
Chapter 5 Exercise 37: Java Programming
*
* (Decimal to binary) Write a program that prompts the user to enter a
* decimal integer and displays its corresponding binary value. Don’t use
* Java’s Integer .toBinaryString(int) in this program./* Note : if access specifier is specified as public then file name and class name should be same and main should be within that class only */
Programming Exercise Solution
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Dec_to_bin
{
public static void main (String[] args)
{
Scanner in = new Scanner(System.in);
//Take User input from keyboard
System.out.println("Enter decimal number: ");
int num = in.nextInt();
int bin =0;
int i=0;
while (num != 0)
{
int d = num % 2;
bin=bin+(d*((int)Math.pow(10,i)));
num /= 2;
i++;
}
System.out.print(" Binary representation is:");
System.out.print(bin);
System.out.println();
}
}
Explanation / Answer
The problem in your code lies here -
bin=bin+(d*((int)Math.pow(10,i)));
Working Code is as below:
public class DecimalToBinary {
public void convertToBinary(int number){
int binary[] = new int[25];
int index = 0;
while(number > 0){
binary[index++] = number%2;
number = number/2;
}
for(int i = index-1;i >= 0;i--){
System.out.print(binary[i]);
}
}
public static void main(String a[]){
DecimalToBinary db = new DecimalToBinary();
db.convertToBinary(25);
}
}
OUTPUT:
11001