Modify NUMBER CONVERSION so that it can perform a conversion in the case when the base is a number between 10 and 17,(11..16). Number systems with bases greater than 10 require more symbols. Therefore, use capital letters. For example, a hexadecimal system requires 16 digits: 0,1,…,9,A,B,C,D,E,F. In this system, decimal number 26 is equal to 1A in hexadecimal notation, because 26/16 = 1 remainder 10 (that is A), and 1/16 = 0 remainder 1.

Nice, you copied and paste your assignment.

So where is "the" work you done so far?