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

#include 

/* Standard iterative function to convert 16-bit integer to BCD */
uint32_t dec2bcd(uint16_t dec) 
{
    uint32_t result = 0;
    int shift = 0;

    while (dec)
    {
        result +=  (dec % 10) << shift;
        dec = dec / 10;
        shift += 4;
    }
    return result;
}

/* Recursive one liner because that's fun */
uint32_t dec2bcd_r(uint16_t dec)
{
    return (dec) ? ((dec2bcd_r( dec / 10 ) << 4) + (dec % 10)) : 0;
}