How to convert from binary to decimal in java?

Question

I am trying to write code in java that takes a binary string from the user, then using arrays(?), makes it a base 10 integer. My friend trying to help me wrote this, but there is no variable "c" and i do not have any idea what he tried to do.

 //Binary Conversion
 System.out.println("Enter a value in binary to convert to decimal");
 int binary = 
 int decimalValue = Integer.parseInt(c, 2);

Before this, i already had skeleton code and a declared keyboard scanner, so I assume that

int binary

is followed by

kbReader.nextInt();

Any help?

String c = kbReader.nextLine(). You need a String to pass to Integer.parseInt. — Andy Turner
– Andy Turner, Commented Feb 6, 2016 at 3:27

emad omara · Accepted Answer · 2016-02-06 03:53:51Z

1

You can read the input as String using scanner.next(); then use the Integer parse method as you said which will take the input string and the wanted radix which is in this case =2

answered Feb 6, 2016 at 3:53

emad omara

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emad omara Over a year ago

System.out.println("Please enter a binary number : "); Scanner scanner=new Scanner(System.in); System.out.println("The decimal value : "+Integer.parseInt(scanner.next(),2));

Somasundar Kanakaraj · Accepted Answer · 2017-08-17 09:44:39Z

1

    **//Conversion between Binary & Decimal**
    public static void main(String args[]){
    **//Binary to Decimal**
            String BtD = "10001110";
            if(isBinary(Integer.parseInt(BtD))){
                System.out.println("Binary Value is ==>> "+Integer.parseInt(BtD));
                System.out.println("Decimal Value is ==>> "+Integer.parseInt(BtD,2));
            }else{
                System.out.println("Not an binary no");
            }
    **//Decimal to Binary**     
            int DtB = 142;
            System.out.println("Decimal Value is ==>> "+DtB);
            System.out.println("Binary Value is ==>> "+Integer.toBinaryString(DtB));
        }
**//To check entered value is binary or not**
        public static boolean isBinary(int number){
            boolean status = true;
            while(true){
                if(number == 0){
                    break;
                }else{
                    int temp = number % 10;
                    if(temp > 1){
                        status = false;
                        break;
                    }
                    number = number /10;
                }
            }
            return status;
        }

edited Aug 17, 2017 at 9:44

answered Aug 16, 2017 at 5:36

Somasundar Kanakaraj

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2 Comments

Dmitry Volkov Over a year ago

Please, consider adding commentaries to your code. It is not always good to answer just with the code, especially with the code this large.

Somasundar Kanakaraj Over a year ago

I'm an newbie. I should consider your words. Yeah.. # Dmitry Volkov

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