12611: Hexadecimal conversion problem

As we all know, is stored in binary computer! But in real life, we have encountered a variety of system conditions,

We have the most contact is the decimal, however, there arevarious count situations in life. For example: seven days a week,

7 hexadecimal twelve months a year, is 12 hexadecimal etc.. Xiao Ming has recently learned C language, familiar with theconversion of various M-ary C language, so we try varioushexadecimal conversion process, and now he wants to write a program, is to put an unsigned number n, into said in B systemunder the. For example:

N 10, B 2, is transformed into 1010. Another example: n 10, B 16,is converted to 0xA.

10 2
10 16 
100 7
1000000000 16

1010
0XA
202
0X3B9ACA00