Convert Binary or Hexadecimal Numbers to Decimal

Overview:

Converting binary and hexadecimal numbers to decimal by hand is pain! Write a program that'll do this for you. It should accept either number, base-2 or base-16 and based on the prefix, 0b and 0x, it should convert to decimal appropriately.

Setup:

Create a class (.java) file called BinHexDec.java

(This can be within a project that contains the other parts of this homework or it can be in separate project on its own)

Features:

ask the user to enter a number in either binary or hex

the number must be prefixed with 0x or 0b for hex and binary respectively

read the input as a string

if the input does not have a valid prefix (X$AAF0) or if it has a valid prefix, but no digits are present after the prefix (only 0x or 0b, without anything after), end the program and say I don't know how to covert that number

if the input contains invalid digits for the specified base (for example F, or 15, for 0b, or base-2), end the program with the message Error parsing base-[either 2 or 16] number

if the input is valid, then convert the number to decimal

you can use Integer.parseInt with a single parameter (that is for the default, decimal)

however you are not allowed to call the two parameter version of parseInt that allows you to use radix

for reference, converting from either a character to an int or a String to an int

Character.getNumericValue(ch) // char to int

ch - 48 // or ch - '0', assuming your character is a digit

Integer.parseInt(s) // string to int, don't use radix for this assignment!

Example Output:

(Converts from hexadecimal to decimal if prefix is 0x)

Please enter a hex (0x)or binary (0b) number:

>0xFFF1

Converting from base-16 to base-10 65521

(Converts from binary to decimal if prefix is 0b)

Please enter a hex (0x) or binary (0b) number:

>0b0101

Converting from base-2 to base-10

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