Binary coded decimal (BCD) to Hexadecimal conversion

Question

can someone explain to me how to convert BCD to Hexadecimal? For example how can i convert 98(BCD) to Hexadecimal. Thanks.

Answer 1

For any BCD encoded value (that will fit in an int).

Iterative:

unsigned int bcd2dec(unsigned int bcd)
{
    unsigned int dec=0;
    unsigned int mult;
    for (mult=1; bcd; bcd=bcd>>4,mult*=10)
    {
        dec += (bcd & 0x0f) * mult;
    }
    return dec;
}

Recursive:

unsigned int bcd2dec_r(unsigned int bcd)
{
    return bcd ? (bcd2dec_r(bcd>>4)*10) + (bcd & 0x0f) : 0; 
}