Java program to convert decimal to binary with explanation

  • on February 4, 2019
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Hello Friends! Welcome to Programming Shortcut,
Today we’ll discuss how to convert a decimal to binary in java. there are two methods to convert decimal to binary

1. Decimal to binary in java with array using while loop,

2. Decimal to binary in java without array using while loop.

Decimal to binary in java

import java.util.Scanner;
public class DecimaltoBinary  {

    public static void main(String[] args) {
Scanner in = new Scanner(System.in);

int a[] = new int[1000];
System.out.println(“Enter a Decimal number to convert binary”);
int decimalnum = in.nextInt();
int temp = decimalnum; //the taken number to save take temp variable.
int n = 0;
while (temp > 0) { // checking the number to till ‘0’
int rem = temp % 2; // taking remainder of number
temp = temp / 2; // after taking remainder update the number
a[n] = rem;  // store the remainder into a array
n++;
}

//print the array in reverse order
System.out.print(“The binary of ” + decimalnum + ” is: “);
for (int i = n – 1; i >= 0; i–) {
System.out.print(a[i]);
}
System.out.println(“n”);
}
}

Output:
Enter a Decimal number to convert binary
23
The binary of 23 is: 10111

Decimal to binary in java without array

import java.util.Scanner;
public class DecimaltoBinary  {    public static void main(String[] args) {
Scanner input = new Scanner(System.in);

System.out.println(“Enter a Decimal number to convert binary”);
int num = input.nextInt();
int n = num;
String temp = “”;
while (n > 0) {
int rem = n % 2;
n = n / 2;
temp = temp + rem;
}
String bin = new StringBuffer(temp).reverse().toString();

System.out.println(“The binary number of ” + num + ” is: ” + bin);
}
}

Output:
Enter a Decimal number to convert binary
24
The binary number of 24 is: 11000

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