Java Program to Convert a Decimal Number to Binary Number using Arrays as Stacks

Given an Integer number convert into Binary Number using arrays as a stack.

Example:

Input : 10
Output: 1010
Input : 16
Output: 10000

Approach:

1. Divide the number by 2 and store the remainder of the number in the array.
2. Divide the number by 2.
3. Repeat the process until the number becomes zero.
4. Print the array in reverse order.

Java

// Java Program to Convert a Decimal Number
// to Binary Number using Arrays as Stacks

import java.util.*;
public class DecimalToBinary {
    static int arr[] = new int[1000];

    // maintaining count variable
    // as the top of the stack
    static int count;

    // push at the count index and increment the count
    public static void push(int n) {
      arr[count++] = n;
    }

    // pop all the elements starting
    // from count-1 till 0
    public static void pop()
    {
        for (int i = count - 1; i >= 0; i--) {
            System.out.print(arr[i]);
        }
    }

    public static void main(String args[])
    {
        int num = 46;

        while (num > 0) {
            int r = num % 2;
            push(r);
            num /= 2;
        }

        System.out.print("Binary equivalent: ");

        pop();
    }
}

Output

Binary equivalent: 101110

Time complexity: O(logn) for given input number n