Question

In a computer system a subtractor is usually not present because

Answer 1

Explanation:

Computer knows only addition

with the help of complements subtraction is made

Answer 2

In a computer system, a subtractor is usually not present because 'the adder will take care of subtraction'.

Explanation:

• The subtractor or subtracting circuits use 2 n – bit operands for producing an n – bit result and a borrow out signal.  
• This subtractor is rarely used in current digital systems, as they can be easily computed using adder circuits.
• An adder circuit can be easily altered as subtractor with a help of combinational logic circuit that can implement encoding of binary numbers.
• Hence the adder is used for summing up a positive number with a negative number. It is same as subtraction.

To know more about adder and subtractor,

1) Draw and explain 4 bits binary adder and subtractor

https://brainly.in/question/11026415

2) Design a 4-bit adder/subtractor circuit with add/sub control line

https://brainly.in/question/2044804