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will create a combination of a variable and constant so that you can access a pin value like a variable or specify its operating mode using one of the five built-in functions previously listed. For example, to create an input pin and poll (read) its value, you could use the code:
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InputPin pin 4 Input InputPin A = InputPin ' ' ' Pin 4 is an input Put "InputPin" (Pin 4) into "input mode" Read and store the current value of "InputPin"
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15.4.2 ASSIGNMENT STATEMENTS AND ARITHMETIC EXPRESSIONS
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The most fundamental operation that the BS2 (or any computer system for that matter) provides is data movement and manipulation. Without this ability, new outputs cannot be derived from the inputs, and execution changes due to changes in the environment are not possible. The assignment statements and arithmetic expressions used in the BS2 are very similar to their counterparts in other programming languages. The assignment statement simply evaluates an arithmetic expression and stores the result in a variable. The format of the assignment statement is:
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VarName = expression
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While the VarName = part of the assignment statement looks straightforward, the expression part probably seems ominous. There s no need to worry; the term expression simply means some number of characters, representing a series of arithmetic operations that evaluate to a numeric value. The assignment statement s expression can be as simple as a constant value like
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A = 23 ' Save the decimal value '23' in variable 'A'
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or it can be another variable
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B = A ' Save the contents of variable 'A' into variable 'B'
Expressions can also be arithmetic operators changing a value in some way. For example, if you wanted to save the value of A multiplied by four in B, you could use the assignment statement and expression combination:
B = A 4 ' Save the product of the contents of 'A' and 4 in 'B'
Table 15-2 lists the different expression operators built into PBASIC that can be used with assignment statements. Note that some of them operate with one parameter while others work with two. Only the minus sign ( ) can be used with either one parameter or two; when it is before (to the left of) the parameter, it returns the two s complement negative value of the parameter, and when it is between two parameters it subtracts the second from the first. Multiple operations can be built into an expression, but there is a facet of PBASIC that is different from other programming languages. Normally in a programming language, there is an order of operations that specifies how mathematical operations in an expression execute. In PBASIC, there is no order of operations. Everything executes from left to right unless there are parentheses to help explain the desired order of operations. For example, if you were to convert a temperature in Fahrenheit to Celsius, you would want to use the arithmetic expression:
DFahrenheit = 9 / 5 DCelsius + 32
This statement would evaluate 9 divided by 5 (1), and multiply it by DCelsius and then add 32 before saving the result in DFahrenheit. The division took place first because it is the left-
15.4 UNDERSTANDING AND USING PBASIC
TABLE 15-2 OPERATOR + * */ ** / // & | ^ << >> ATN HYP MIN MAX DIG REV ABS COS SIN ~ SQR DCD NCD
PBASIC Assignment Statement Operators FUNCTION Addition Subtraction Negation Multiplication Fractional Multiplication High Word Multiplication Division Modulus Bitwise AND Bitwise OR Bitwise XOR Shift Left n Bits Shift Right n Bits Get arcTangent Get Hypotenuse Return Minimum Value Return Maximum Value Return Specified Digit Reverse Set # of Bites Return Absolute Value Return Cosine of Value Return Sine of Value Bitwise Invert Return Square Root Set Specified Bit Return Highest Bit PARAMETERS 2 2 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 EXAMPLE USAGE A = B + C A = B - C A = -B A = B * C A = B */ C A = B ** C A = B / 2 A = B // 2 A = B & $F A = B | %1 A = B ^ 1 A = B << n A = B >> n ' Product Middle ' High Product Word ' Integer Division ' Return Odd/Even ' Return Low 4 Bits ' Return Odd/Even ' Switch Lowest Bit ' Shift Left n Bits ' Shift Right n Bits
A = XCord ATN YCord A = XCord HYP YCord A = Value1 MIN Value2 A = Value1 MAX Value2 A = Value DIG Digit A = Value1 REV Value2 A = ABS B A = COS B A = SIN(B) A = ~B A = SQR B A = DCD 4 A = NCD 32 ' Same as A = 1 << 4 ' Returns '5'
most operator. Dividing constant values can be tricky because numeric values in PBASIC (and other microcontroller programming language values) are integers (with no decimal points) only. Before doing any division, remember to always do the multiplication first. To force the PBASIC compiler to put your arithmetic operators in the desired order, put parentheses around the higher priority (and first executing) operators and their parameters. Using parameters to fix the degree conversion assignment statement becomes:
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