#C STRING TO BCD PRO#
#C STRING TO BCD CODE#

I like to start our team meetings off with an ice breaker or team building exercise. Tech Team Building / Ice Breakers Collaboration.e., only each other digit goes into a new byte, with shifting one of both BCD values into the upper nibble of the current byte). Welcome to Tuesday! If we roll back the calendar a few years to October 11, 1887, today is the day that Dorr Eugene Felt is granted the second of two patents on his comptometer, the first key-driven adding an. nibble-shifting that is required for BCD (i.

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#C STRING TO BCD PRO#

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#C STRING TO BCD CODE#

Write a small piece of code to read every byte of data and do thisĬonversion. ForĮxample in my company they used a filler to make all odd nymber digits have The rules for filler could be established and followed internally. For example a phone number thatĬomes in as text 4506467700 would be 10 bytes long, and in BCD, 5 byte long. Required to represent a number in this form.

Since binaryĬoded decimal is used to represent digit 0-9 no more than 4 bits are In doing a text to TBCD conversion, you take a string of characters (each 8īit long) and convert it into a series of 4 bit quantities. Never bothered to look at the details of implementation.Īt a high level I can tell you something like this: In or environment, we had a C function that converts TBCD to text and viceĬersa, it has always been there (long before I started working on it) so I I remember reading about Java supoorting this aĬouple of years ago but I never had a chance to look at the details. Wikipedia is a registered trademark of the Wikimedia Foundation, Inc., a non-profit organization.I have used this in my previous job. In the example above, 11110011, the thought process would be: one, three, seven, fifteen, thirty, sixty, one hundred twenty-one, two hundred forty-three, the same result as that obtained above.īy using this site, you agree to the Terms of Use and Privacy Policy. It is performed by reading the binary number from left to right, doubling if the next bit is zero, and doubling and adding one if the next bit is one. Notice that this implementation is designed to convert an input register of any width, by taking an array as its parameter and returning a dynamically allocated string.Īlso notice that this implementation does not store an explicit copy of the input register in its scratch space, as the description of the algorithm did copying the input register into the scratch space was just a pedagogical device. Reversing the algorithm is done by reversing the principle steps of the algorithm. The decimal value of the BCD digits is: 610 4 510 3 210 2 410 1 410 0 65244.īy applying the reverse double dabble algorithm a BCD number can be converted to binary. The BCD digits to the left of the original register space display the BCD encoding of the original value 243. The increment ensures that a value of 5, incremented and left-shifted, becomes 16 (10000), thus correctly carrying into the next BCD digit. On each iteration, any BCD digit which is at least 5 (0101 in binary) is incremented by 3 (0011) then the entire scratch space is left-shifted one bit. It takes a maximum of 4 bits in binary to store each decimal digit.įor example, if the original number to be converted is eight bits wide, the scratch space would be partitioned as follows. Reserve a scratch space wide enough to hold both the original number and its BCD representation n 4 ceil ( n 3) bits will be enough.

C string to bcd