I need help writing a JAVA and I CANNOT use pre-defined built-in functions. I need to transfer binary or decimal to other numbers using mathematics, not by using the built-in function in Java.

hexadecimal and decimal numbers. Your program would - ask the users to enter a number in binary or decimal - ask the users what type of number it is (binary or decimal) - check to make sure the number is legal (a decimal number contains only 0-9). If the number is not legal, it should error out! - If the number is legal, convert the number to the other 3 types (Hint: There are a total of 4 types: binary, octal, hexadecimal, decimal) To challenge yourself, your program should also handle floating numbers although this step is NOT required. NOTE: As always, properly document your program. Add in headers. Add in comments. You CANNOT use pre-defined built in functions to do the conversion such as the following!! Integer.toString (n,8)// decimal to octal Integer.toString (n,2)// decimal to binary Integer.toString (n,16)// decimal to Hex Your program needs to mimic the algorithm we discussed in class. You must use the addition/subtraction method or the division/multiplication method