How to use Arrays In Java
Algorithm
- Store the remainder when the number is divided by 2 in an array.
- Divide the number by 2
- Repeat the above two steps until the number is greater than zero.
- Print the array in reverse order now.
The below diagram shows an example of converting the decimal number 17 to an equivalent binary number.
Java Program to Convert Decimal Number to Binary Using Arrays
Java
// Java program to convert a decimal // number to binary number import java.io.*; class GFG { // function to convert decimal to binary static void decToBinary(int n) { // array to store binary number int[] binaryNum = new int[1000]; // counter for binary array int i = 0; while (n > 0) { // storing remainder in binary array binaryNum[i] = n % 2; n = n / 2; i++; } // printing binary array in reverse order for (int j = i - 1; j >= 0; j--) System.out.print(binaryNum[j]); } // driver program public static void main (String[] args) { int n = 17; System.out.println("Decimal - " + n); System.out.print("Binary - "); decToBinary(n); } } |
Decimal - 17 Binary - 10001
The complexity of the above method:
Time Complexity: O(log2(n))
Auxiliary Space: O(1000)
Java Program for Decimal to Binary Conversion
Given a decimal number as input, we need to write a program to convert the given decimal number into an equivalent binary number.
Examples:
Input : 7
Output : 111Input: 33
Output: 100001
Binary-to-decimal conversion is done to convert a number given in the binary system to its equivalent in the decimal number system. A number system is a format to represent numbers in a certain way.
Binary Number System – The binary number system is used in computers and electronic systems to represent data, and it consists of only two digits which are 0 and 1.
Decimal Number System – The decimal number system is the most commonly used number system worldwide, which is easily understandable to people. It consists of digits from 0 to 9.