Solution: In binary coding, every symbol that appears in data is represented by a group of bits, which are called bytes. Computer codes use binary coding schemes.

Solution: In a Binary Coded Decimal format, 64 characters i.e. 26 different characters can be represented. It is one of the early computer codes.

Solution: There is no coding scheme like EDIC. EBCDIC stands for Extended Binary Coded Decimal Interchange Code. BCD stands for Binary Coded Decimal. ASCII stands for American Standard Code for information interchange.

Solution: BCD numbers are represented as:
34 = (0011 0100)BCD.
Each digit is individually taken and an equivalent standard 4 bit term is written for the respective digit.

Solution: To add any two BCD numbers :
Simply perform the addition : 23+20=43.
Then, write the equivalent BCD number = (0100 0011)BCD.

Solution: BCD is a weighted code and it uses the weights 8,4,2,1 respectively. It is often called the 8421 code. Since, it uses 4 bits for the representation therefore the weights are assigned as : 23 = 8, 22 = 4, 21 = 2, 20 = 1.

Solution: To obtain the decimal equivalent :
We start from the rightmost bit and make groups of 4, then write the decimal equivalent accordingly.
0011 0001 = (31)10.

Solution: The 9’s complement of a number is obtained by subtracting each digit from 9. Here, 99-45=54. Therefore, the 9’s complement is 54.

Solution: To obtain the 10’s complement, we first obtain the 9’s complement and then add 1 to it.
999-455=544 (9’s)
544+1=545(10’s).

Solution: The excess-3 code is obtained by adding 3 to the BCD code.
Here, 0100+0011=0111.
Also, 4+3=7.