 Home
 Products
 Integration
 Tutorial
 Barcode FAQ
 Purchase
 Company
barcode reader code in asp.net c# Part II in Software
Part II Recognizing Quick Response Code In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. QRCode Creator In None Using Barcode encoder for Software Control to generate, create QR Code ISO/IEC18004 image in Software applications. Electronics
QR Code ISO/IEC18004 Scanner In None Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications. Encoding Quick Response Code In C#.NET Using Barcode generation for .NET Control to generate, create Denso QR Bar Code image in .NET framework applications. copy each bit until the rst 1 has been copied, and then replace each successive 1 by a 0 and each 0 by a 1 You may wish to try this rule on the two previous examples to verify that it is much easier to use than the subtraction from 2n Different conventions exist in the binary system to represent whether a number is negative or positive One convention, called the signmagnitude convention, makes use of a sign bit, usually positioned at the beginning of the number, for which a value of 1 represents a minus sign and a value of 0, a plus sign Thus, an eightbit binary number would consist of a sign bit followed by seven magnitude bits, as shown in Figure 138(a) In a digital system that uses eightbit signed integer words, we could represent integer numbers (decimal) in the range (27 1) N +(27 1) or 127 N +127 Paint QR Code In VS .NET Using Barcode printer for ASP.NET Control to generate, create QR Code JIS X 0510 image in ASP.NET applications. QR Code Encoder In .NET Using Barcode encoder for .NET framework Control to generate, create QR Code image in VS .NET applications. Sign bit b7
QR Code JIS X 0510 Encoder In Visual Basic .NET Using Barcode creation for Visual Studio .NET Control to generate, create QR Code image in VS .NET applications. Make Bar Code In None Using Barcode creator for Software Control to generate, create barcode image in Software applications. b4 (a) Create Code 128 Code Set A In None Using Barcode generation for Software Control to generate, create Code 128 Code Set A image in Software applications. Generate Data Matrix 2d Barcode In None Using Barcode creator for Software Control to generate, create ECC200 image in Software applications. Actual magnitude of binary number
Encode Bar Code In None Using Barcode encoder for Software Control to generate, create bar code image in Software applications. Drawing UCC  12 In None Using Barcode printer for Software Control to generate, create USS128 image in Software applications. Sign bit b7
USPS POSTal Numeric Encoding Technique Barcode Creation In None Using Barcode generator for Software Control to generate, create Delivery Point Barcode (DPBC) image in Software applications. Reading Code 128 Code Set C In Visual Basic .NET Using Barcode decoder for Visual Studio .NET Control to read, scan read, scan image in Visual Studio .NET applications. Actual magnitude of binary number (if b 7 = 0) One s complement of binary number (if b 7 = 1) (b) Sign bit b7 b6 b5 b4 b3 b2 b1 b0 Actual magnitude of binary number (if b 7 = 0) Two s complement of binary number (if b 7 = 1) (c) Making Data Matrix ECC200 In Java Using Barcode creator for Java Control to generate, create Data Matrix 2d barcode image in Java applications. USS Code 39 Encoder In Java Using Barcode encoder for Java Control to generate, create Code 39 image in Java applications. Figure 138 (a) Eightbit signmagnitude binary number; (b) Eightbit one s complement binary number; (c) Eightbit two s complement binary number Painting Bar Code In ObjectiveC Using Barcode printer for iPad Control to generate, create bar code image in iPad applications. DataMatrix Printer In .NET Using Barcode drawer for ASP.NET Control to generate, create Data Matrix ECC200 image in ASP.NET applications. A second convention uses the one s complement notation In this convention, a sign bit is also used to indicate whether the number is positive (sign bit = 0) or negative (sign bit = 1) However, the magnitude of the binary number is represented by the true magnitude if the number is positive, and by its one s complement if the number is negative Figure 138(b) illustrates the convention For example, the number (91)10 would be represented by the sevenbit binary number (1011011)2 with a leading 0 (the sign bit): (01011011)2 On the other hand, the number ( 91)10 would be represented by the sevenbit one s complement binary number (0100100)2 with a leading 1 (the sign bit): (10100100)2 Most digital computers use the two s complement convention in performing integer arithmetic operations The two s complement convention represents positive numbers by a sign bit of 0, followed by the true binary magnitude; negative numbers are represented by a sign bit of 1, followed by the two s complement of the binary number, as shown in Figure 138(c) The advantage of the two s complement convention is that the algebraic sum of two s complement binary numbers is carried out very simply by adding the two numbers including the sign bit Example 131 illustrates two s complement addition Code 39 Extended Scanner In Java Using Barcode scanner for Java Control to read, scan read, scan image in Java applications. Linear 1D Barcode Encoder In Visual Studio .NET Using Barcode creation for VS .NET Control to generate, create Linear Barcode image in VS .NET applications. 13
Digital Logic Circuits
EXAMPLE 131 Two s Complement Operations
Problem
Perform the following subtractions using two s complement arithmetic: 1 X Y = 1011100 1110010 2 X Y = 10101111 01110011 Solution
Analysis: The two s complement subtractions are performed by replacing the operation X Y with the operation X + ( Y ) Thus, we rst nd the two s complement of Y and add the result to X in each of the two cases: X Y = 1011100 1110010 = 1011100 + (27 1110010) = 1011100 + 0001110 = 1101010 Next, we add the sign bit (in boldface type) in front of each number (1 in rst case since the difference X Y is a negative number): X Y = 11101010 Repeating for the second subtraction gives: X Y = 10101111 01110011 = 10101111 + (28 01110011) = 10101111 +10001101 = 00111100 = 000111100 where the rst digit is a 0 because X Y is a positive number The Hexadecimal System
Table 136 Hexadecimal code 0 1 2 3 4 5 6 7 8 9 A B C D E F 0000 0001 0010 0011 0100 0101 0110 0111 1000 1001 1010 1011 1100 1101 1110 1111 It should be apparent by now that representing numbers in base 2 and base 10 systems is purely a matter of convenience, given a speci c application Another base frequently used is the hexadecimal system, a direct derivation of the binary number system In the hexadecimal (or hex) code, the bits in a binary number are subdivided into groups of four Since there are 16 possible combinations for a fourbit number, the natural digits in the decimal system (0 through 9) are insuf cient to represent a hex digit To solve this problem, the rst six letters of the alphabet are used, as shown in Table 136 Thus, in hex code, an eightbit word corresponds to just two digits; for example: 1010 01112 = A716 0010 10012 = 2916 Binary Codes In this subsection, we describe two common binary codes that are often used for practical reasons The rst is a method of representing decimal numbers in digital logic circuits that is referred to as binarycoded decimal, or BCD, representation In effect, the simplest BCD representation is just a sequence of fourbit binary numbers that stops after the rst 10 entries, as shown in Table 137 There are

