Unsigned Integer to BCD conversion?

Question

I know you can use this table to convert decimal to BCD:

0 0000

1 0001

2 0010

3 0011

4 0100

5 0101

6 01

Answer 1

Would something like this work for your conversion?

#include 
#include 

using namespace std;

string dec_to_bin(unsigned long n)
{
    return bitset::digits>(n).to_string, allocator >();
}