There are two following ways to convert binary number to decimal number:
1) Using Integer.parseInt() method of Integer class.
2) Do conversion by writing your own logic without using any predefined methods.
Method 1: Binary to Decimal conversion using Integer.parseInt() method
import java.util.Scanner; class BinaryToDecimal { public static void main(String args[]){ Scanner input = new Scanner( System.in ); System.out.print("Enter a binary number: "); String binaryString =input.nextLine(); System.out.println("Output: "+Integer.parseInt(binaryString,2)); } }
Output:
Enter a binary number: 1101 Output: 13
Method 2: Conversion without using parseInt
public class Details { public int BinaryToDecimal(int binaryNumber){ int decimal = 0; int p = 0; while(true){ if(binaryNumber == 0){ break; } else { int temp = binaryNumber%10; decimal += temp*Math.pow(2, p); binaryNumber = binaryNumber/10; p++; } } return decimal; } public static void main(String args[]){ Details obj = new Details(); System.out.println("110 --> "+obj.BinaryToDecimal(110)); System.out.println("1101 --> "+obj.BinaryToDecimal(1101)); System.out.println("100 --> "+obj.BinaryToDecimal(100)); System.out.println("110111 --> "+obj.BinaryToDecimal(110111)); } }
Output:
110 --> 6 1101 --> 13 100 --> 4 110111 --> 55
Please create notes for struts and other framework
I was about to know the Method 2 program .How to add or sum all the values that are displayed in console or command prompt
eg:
110 –> 6
1101 –> 13
100 –> 4
110111 –> 55 i should get the decimal value at last
Thanks dude. This help-me a lot…..great job.
You need to cast (int) before Math.pow, as java returns a double() for this expression
Sorry , i was eager not to see the int temp inside the if. Well done mate :))
I wonder how to deal with negative powers in the input.
Example if you want to convert the decimal 0.001 to binary.