PPT - Computer Arithmetic Computer Science Engineering (CSE) Notes | EduRev

Computer Architecture and Organisation (CAO) - Notes & all

Computer Science Engineering (CSE) : PPT - Computer Arithmetic Computer Science Engineering (CSE) Notes | EduRev

 Page 1


Computer Arithmetic
Page 2


Computer Arithmetic
Arithmetic & Logic Unit
 Does the calculations
 Everything else in the computer is there
to service this unit
 Handles integers
 May handle floating point (real) numbers
 May be separate FPU (maths co-
processor)
 May be on chip separate FPU (486DX +)
Page 3


Computer Arithmetic
Arithmetic & Logic Unit
 Does the calculations
 Everything else in the computer is there
to service this unit
 Handles integers
 May handle floating point (real) numbers
 May be separate FPU (maths co-
processor)
 May be on chip separate FPU (486DX +)
ALU Inputs and Outputs
Page 4


Computer Arithmetic
Arithmetic & Logic Unit
 Does the calculations
 Everything else in the computer is there
to service this unit
 Handles integers
 May handle floating point (real) numbers
 May be separate FPU (maths co-
processor)
 May be on chip separate FPU (486DX +)
ALU Inputs and Outputs Integer Representation
 Only have 0 & 1 to represent everything
 Positive numbers stored in binary
—e.g. 41=00101001
 No minus sign
 No period
 Sign-Magnitude
 Two’s compliment
Page 5


Computer Arithmetic
Arithmetic & Logic Unit
 Does the calculations
 Everything else in the computer is there
to service this unit
 Handles integers
 May handle floating point (real) numbers
 May be separate FPU (maths co-
processor)
 May be on chip separate FPU (486DX +)
ALU Inputs and Outputs Integer Representation
 Only have 0 & 1 to represent everything
 Positive numbers stored in binary
—e.g. 41=00101001
 No minus sign
 No period
 Sign-Magnitude
 Two’s compliment
Sign-Magnitude
 Left most bit is sign bit
 0 means positive
 1 means negative
 +18 = 00010010
 -18 = 10010010
 Problems
—Need to consider both sign and magnitude in
arithmetic
—Two representations of zero (+0 and -0)
Read More
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