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# Digital Electronics - Digital Arithmetic Operations and Circuits

### Exercise

"You cannot shake hands with a clenched fist."
- Indira Gandhi
1.

For a 4-bit parallel adder, if the carry-in is connected to a logical HIGH, the result is:

 A. the same as if the carry-in is tied LOW since the least significant carry-in is ignored. B. that carry-out will always be HIGH. C. a one will be added to the final result. D. the carry-out is ignored.

2.

What is the first thing you will need if you are going to use a macrofunction?

 A. A complicated design project B. An experienced design engineer C. Good documentation D. Experience in HDL

3.

Perform subtraction on each of the following binary numbers by taking the two's-complement of the number being subtracted and then adding it to the first number.
01001        01100
00011        00111

 A. 01100    10011 B. 00110    00101 C. 10110    10101 D. 00111    00100

4.

Solving –11 + (–2) will yield which two's-complement answer?

 A. 1110 1101 B. 1111 1001 C. 1111 0011 D. 1110 1001

5.

Multiply the following binary numbers.
 1010 1011 1001 ×0011 ×0111 ×1010

 A. 0001  1110    0100  1101    0101  1011 B. 0001  1110    0100  1100    0101  1010 C. 0001  1110    0100  1101    0101  1010 D. 0001  1101    0100  1101    0101  1010