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in which the contents of k are stored in j. While the statement is described as storing the contents of one variable into another, the original (value source) variable s contents don t change or are taken away the value is copied from k and the same value put into j. At the end of the statement, both j and k store the same value. Finally, in
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i = (j k) + Src
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FIGURE 13-2 Variables can be thought of as a series of boxes, each of which is given a name to allow the data to be easily found.
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the computer will retrieve the contents of j, k and Src, find the product of j and k, add it to Src, and then save the computed value into i. This is an example of a complex assignment statement, which will be discussed later in the chapter. I/O ports and hardware special function registers usually use the variable format for reading and writing values into the computer s hardware. So, to output 123 from a computer system I/O port, a statement like this is used:
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IOPort = 123
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When you are new to programming, this can be confusing. Hardware that is treated like registers can be difficult to visualize (especially when you retrieve the value of a register and find that it has changed due to a changing input or a counter value). The data stored in variables come in many forms, and how you choose to store and display data can make your programming much easier to work through or much harder due to many difficult to find errors. There are three different aspects of data, including the amount of space used to store individual values, the format the data is displayed in, and whether relevant pieces of data can be stored together. These three aspects are discussed in the following two sections. 13.1.3.1 Data Types Several different data types are available to all types of programming for storing data in variables and I/O ports. Which one you choose will depend on the data being stored in them. The values might represent a number like 1 or 127, the numeric equivalent of a text character (65 is A using the ASCII standard), or a binary value like 00010001, which could mean run both motors forward in your robot. No matter what form the data type is in, most programming languages expect to see data follow predefined types. This is necessary so the data can be properly stored in memory. The most common data type is the eight-bit integer, so-called because the value stores an integer (a whole number) using eight bits. With eight bits, the program can work with a number from 0 to 255 (or 128 to +127, depending on how it uses the eighth bit). The basic data types that you can expect in a programming language are as follows:
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one-bit value, which can hold a 1/0, true/false or high/low value eight-bit integer, or byte (can hold a number or a string value) eight-bit ASCII character 16-bit integer, or word 32-bit integer, or long or double word (dword) 32-bit floating point, or single (floating point means a number with a decimal point)
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In many cases, the language provides for either or both signed and unsigned values. The first bit (called the most significant bit, or MSB) is either 0 or 1, which means a positive or negative value. With a 16-bit unsigned integer, for example, the program can store values from 0 to 65535. With a 16-bit signed integer, the program can store values from 32768 to +32767.
13.1 IMPORTANT PROGRAMMING CONCEPTS
13.1.3.2 Number Bases In school you learned that when every number is written out, it is done as part of a base or radix. This is the number of different characters a single digit can have. We are most familiar with the base 10 (known as decimal) due to the number of fingers we have, allowing our ancestors to easily count and add without the need for a pencil and paper. Values larger than the maximum number of characters allowed in a single digit caused additional, higher value digits to be used. These digits are multiplied by the next power of the number base. To illustrate what this means, consider the number 123. The value is larger than what a single digit can be so digits multiplied by different powers of the base are used. The single digits are multiplied by the base to the power 0. Tens are the base to the power 1 and hundreds are the base to the power 2. The number can be written out mathematically as:
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