[ASSIGMENT] Numeral Systems Converter

Question

A numeral system is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. Make a program like a calculator to convert from one numeral system to another one.
Input Example: D 45 H
Output Example:2D
Where D is Decimal as input and H is Hexadecimal as output.
Use this symbols:
D - Decimal
O - Octal
B - Binary
H -Hexadecimal
I already send as assigment to SL.

Answer 1

This my example of code for the assigment. Thanks
https://code.sololearn.com/cb9trOCX603C/?ref=app

Answer 2

java has functions too, but the point of the challenge is to make the code without use the functions.

Answer 3

c# has really nice built in functions for exactly this
https://code.sololearn.com/csbsnwVHHqAI/?ref=app