# what is adder and how does it work?

Do you know what is adder circuit? adder circuit is a series of logical gates arranged in such a way that it can complete the addition operation in binary form

So the function of the adder circuit is to perform the addition operation in binary form

The adder chain consists of several kinds of them

The opposite of the adder circuit is the subtractor circuit

The Half Adder circuit can be created using an And Gate and an Xor Gate

• 0 + 0 = 0
• 0 + 1 = 1
• 1 + 0 = 1
• 1 + 1 = 0 remaining 1

The Adder circuit is arranged so that it can perform the addition operation as above

• Pin A serves to enter the first Input
• Pin B serves to enter the second Input
• Pin S serves to display the sum of A + B
• Pin C serves for the Carry output of the remaining sum

The disadvantage of the Half adder is that it can not pass the carry value to the next circuit and can not accept the carry value of the previous series

Hence it is called Half adder

To overcome the deficiencies in the Half adder then created a full adder series

Full adder circuit is an adder circuit that can accept carry in value from previous circuit and forward carry out value to next circuit

Consider the following picture

The above circuit forms a full adder circuit or a 1 bit sum sequence

To create a series of adders that can add up a few bits then we need to assemble some full adders into one so as to form a parallel adder