Decimal to binary conversion using Java

May 26, 2022

Decimal to Binary conversion using Java

In this article we will create program for decimal to binary conversion using java. For this purpose we need to ask a decimal number from user and convert that decimal number to its binary equivalent form and then print the converted number on to the screen.

Working

For conversion, we divide the decimal number by 2 and get the quotient
for the next iteration and continuously store the remainder value in an
array in reverse order till the decimal number is greater than 0. For better understanding with an example just have a look towards the diagram
shown at the right.

Example : Decimal number 5 = 101 in binary representation.

Algorithm

Initialize a empty array name binary
While decimal is greater then zero
If decimal is even r equals to 0 and else set 1
Append r to binary
Set decimal as half of its value

Java Code

Run

//Java program to convert decimal number to binary number
public class Main
{
	public static void main(String args[])
	{   
		//Decimal Number
		int decimal = 12;
		//integer array for storing binary digits 
		int binary[] = new int[20];
		int i = 0; 
		//writing logic for the conversion 
		while(decimal > 0)
		{       
			int r = decimal % 2;
			binary[i++] = r;
			decimal = decimal/2;
		}
		//printing result
		System.out.print("Binary number : ");
		for(int j = i-1 ; j >= 0 ; j--)
		System.out.print(binary[j]+"");
	}
}

Output

Binary number : 1100