vb.net barcode reader tutorial 100 = 3 1 2 101 = 2 10 1 102 = 1 100 Total = 3 = 20 = 100 = 123 in Software

Printer QR Code 2d barcode in Software 100 = 3 1 2 101 = 2 10 1 102 = 1 100 Total = 3 = 20 = 100 = 123

3 100 = 3 1 2 101 = 2 10 1 102 = 1 100 Total = 3 = 20 = 100 = 123
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Decimal is the most convenient base for humans to work with, but it isn t for computers. Computer circuitry is built from digital logic, which can be either a one (1) or zero (0). Rather than develop circuitry that only works with base 10 numbers, computer designers instead have chosen to have them work in terms of base 2, or binary. The operation of binary is identical to that of decimal, except each digit is a power of 2, not a power of 10. Using this information, Table 13-1 was developed to show the values for each digit of an eight-bit binary number. Note that the bit number is actually the power of 2 for the digit.
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TABLE 13-1 Binary number values. The % in front of the binary number is used to indicate the value is binary and not decimal or hexadecimal. BIT 0 1 2 3 4 5 6 7 BINARY VALUE %00000001 %00000010 %00000100 %00001000 %00010000 %00100000 %01000000 %10000000 DECIMAL VALUE 1 = 20 2 = 21 4 = 22 8 = 23 16 = 24 32 = 25 64 = 26 128 = 27
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Knowing the decimal values for each bit, a decimal number can be converted to a binary number by taking away the highest possible value. The decimal number 123 can be converted to binary as:
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Bit Bit Bit Bit Bit Bit Bit Bit 7 6 5 4 3 2 1 0 = 128 cannot be taken away from 123 = 64 can be taken away from 123 = 32 can be taken away from 59 = 16 can be taken away from 27 = 8 can be taken away from 11 = 4 cannot be taken away from 3 = 2 can be taken away from 3 = 1 can be taken away from 1 %0xxxxxxx %01xxxxxx %011xxxxx %0111xxxx %01111xxx %011110xx %0111101x %01111011
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So, the binary number 01111011 is equivalent to the decimal number 123. When binary numbers are written in this book, they are proceeded by a percent (%) character, which is used in BASIC to indicate that a number is binary and not decimal. Binary numbers can be cumbersome to work with it should be obvious that trying to remember, say, and record zero-one-one-one-one-zero-one-one is tedious at best. To help make working with large binary numbers easier, hexadecimal, or base 16, numbers (which can be represented by four bits) is commonly used. Hexadecimal numbers consist of the first 10 decimal digits followed by the first six letters of the alphabet (A through F) as shown in Table 13-2. The same methodology is used for converting decimal values to hexadecimal as was used for binary, except that each digit is 16 times the previous digit. The 123 decimal works out to $7B where the $ character is used in BASIC to indicates it s a hexadecimal number. When programming, it is recommended that binary values are used for single bits, hexadecimal is used for register values, and decimal for everything else. This will make your program reasonably easy to read and understand and imply what the data is representing in the program without the need for explaining it explicitly.
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13.1.4 ASSIGNMENT STATEMENTS
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To move data between variables in a computer system, you will have to use what is known as an assignment statement; some value is stored in a specific variable and uses the format
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DestinationVariable = SourceValue
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where the SourceValue can be an explicit number (known as a constant, literal, or immediate value) or a variable. If SourceValue is a variable, its contents are copied from SourceValue and the copy of the value is placed into DestinationVariable. Going back to the previous section, the SourceValue could also be a structure or union element. The most correct way of saying this is The contents of SourceValue are stored in DestinationValue, but this implies that the number is physically taken from SourceValue (leaving nothing behind) and storing it in DestinationValue. It has to be remembered that the value stored in SourceValue does not change in an assignment statement. 13.1.4.1 Mathematical Expressions A computer wouldn t be very useful if all it could do is load variables with constants or the value of other variables. They must also
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