# Convert a decimal into a binary number using stack.

This example shows how to convert decimal number into a binary number using stack.

 ```package com.java2novice.ds.stack; public class MyDecimalToBinary { public static String convertDecialToBinary(int number){ StringBuilder binary = new StringBuilder(); MyDynamicStack stack = new MyDynamicStack(10); if(number == 0){ binary.append("0"); } else { while(number != 0){ stack.push(number%2); number = number/2; } } while(!stack.isStackEmpty()){ try { binary.append(stack.pop()); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } } return binary.toString(); } public static void main(String a[]){ System.out.println("Binary value of 2 is: "+convertDecialToBinary(2)); System.out.println("Binary value of 15 is: "+convertDecialToBinary(15)); System.out.println("Binary value of 23 is: "+convertDecialToBinary(23)); } } class MyDynamicStack { private int stackSize; private int[] stackArr; private int top; /** * constructor to create stack with size * @param size */ public MyDynamicStack(int size) { this.stackSize = size; this.stackArr = new int[stackSize]; this.top = -1; } /** * This method adds new entry to the top * of the stack * @param entry * @throws Exception */ public void push(int entry){ if(this.isStackFull()){ System.out.println(("Stack is full. Increasing the capacity.")); this.increaseStackCapacity(); } System.out.println("Adding: "+entry); this.stackArr[++top] = entry; } /** * This method removes an entry from the * top of the stack. * @return * @throws Exception */ public int pop() throws Exception { if(this.isStackEmpty()){ throw new Exception("Stack is empty. Can not remove element."); } int entry = this.stackArr[top--]; //System.out.println("Removed entry: "+entry); return entry; } /** * This method returns top of the stack * without removing it. * @return */ public long peek() { return stackArr[top]; } private void increaseStackCapacity(){ int[] newStack = new int[this.stackSize*2]; for(int i=0;i

 Output: ```Adding: 0 Adding: 1 Binary value of 2 is: 10 Adding: 1 Adding: 1 Adding: 1 Adding: 1 Binary value of 15 is: 1111 Adding: 1 Adding: 1 Adding: 1 Adding: 0 Adding: 1 Binary value of 23 is: 10111 ```

#### List of Stack Data Structure Examples

Knowledge Centre
ServletOuptputStream Vs PrintWriter
ServletOutputStream: ServletResponse.getOutputStream() returns a ServletOutputStream suitable for writing binary data in the response. The servlet container does not encode the binary data, it sends the raw data as it is.

PrintWriter: ServletResponse.getWriter() returns PrintWriter object which sends character text to the client. The PrintWriter uses the character encoding returned by getCharacterEncoding(). If the response's character encoding has not been specified then it does default character encoding.
Famous Quotations
Education is what remains after one has forgotten what one has learned in school.
-- Albert Einstein