Bcd codes

BCD (Binary Coded Decimal) code represents each decimal digit of a number with a unique 4-bit binary pattern, so a decimal number with k digits requires 4k bits to store in BCD. A decimal number matches its BCD representation only when the number is between 0-9. BCD addition is performed digit-by-digit on corresponding bits. For example, adding 184 + 576 in BCD first adds 4 + 6 bit-by-bit, carrying the 1 to the hundreds place.