Then the third input is the B1, B2, B3 EXORed with K to the second, third and fourth full adder respectively. A1, A2, A3 are direct inputs to the second, third and fourth full adders. The sum/difference S0 is recorded as the least significant bit of the sum/difference. Then C0 is serially passed to the second full adder as one of it’s outputs. This suggests that When K=0, the operation is performed on the four-bit numbers in addition. The operation is A+B which is simple binary addition. Similarly If the Value of K=0, B0 (exor) K=B0. This suggests that when K=1, the operation being performed on the four-bit numbers is subtraction. Now 2’s complement subtraction for two numbers A and B is given by A+B’+Cin. If the value of K (Control line) is 1, the output of B0(exor)K=B0′(Complement B0). ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys. ![]() GATE CS Original Papers and Official Keys.Full Stack Development with React & Node JS(Live).Java Programming - Beginner to Advanced.OS DBMS CN for SDE Interview Preparation.Data Structure & Algorithm-Self Paced(C++/JAVA).Full Stack Development with React & Node JS (Live).Data Structure & Algorithm Classes (Live).
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