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\ B = 6 \ C = 4.2 A/B //prints 0 C/B //prints 0.7 1.0*A/B //prints 0.83333
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B.7.2 STRINGS Strings are text and must be enclosed in quotes. In many programs strings are used to communicate with the user. Any time you need to display results to the user in a friendly fashion, or prompt the user regarding what to do next or how to use your program, strings are required. For example:
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Print Hello World // Hello world is a string
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RobotBASIC has many functions and commands that require and/or return strings. There are functions to convert strings and manipulate them. Strings can be as long as required, there is no limitation on the string size. You de ne a string within your program by using the quote ( ) character. A string is surrounded by a pair of quote characters. If you need to use the quote character within the string as part of the string you must make it a double quote ( ). For example:
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Print Hello World // will print Hello World
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B.7.3 SIMPLE VARIABLES A variable is a named storage area to keep numbers or strings. Variable names must start with a letter but then any combination of letters and numbers can be used. Variable names are case sensitive, so Distance and distance a re different.
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APPENDICES
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The length of a variable name can be up to 255 characters, so you can use names like DistanceToBeacon_1. It is important to use meaningful names in your programs because this makes your programs easier to read and understand. A variable can be used anywhere a number or string is used. As long as the variable has been assigned a value before using it, it can substitute for its value. A variable is assigned a value in an assignment statement (see Sec. B.3) or by passing it as a parameter to a command that will assign it a value. Unlike standard BASIC and many other programming languages, variables in RobotBASIC do not have to be prede ned as being of a speci c type. Any variable can store any value type ( oat, integer, or string). Additionally, you can reassign a value of a different type to a variable that already holds a certain type. If a variable exists when it is being assigned a value, it does not matter what the old value is or of what type it is, the new value will replace the old one. If the original value is an integer and the new value is a string the variable type will be changed to a string, and vice versa. The same is true for oats and integers and oats and strings. In certain operations RobotBASIC will convert between variable types as necessary if it can. For example, if you add an integer to a string the integer will be converted to its string representation and concatenated to the string. If the operation cannot be performed the system will return an error. For example:
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Message= Hello World //assigns a variable a value Today=Date(1) //assigns a variable the value of a function Print Message // will print Hello World Print Today is ,Today //will print Today is 2007/03/01 rGps X_Pos,Y_Pos //will assign X_Pos the robot s x //position and Y_Pos the y position Distance=PolarR(X_Pos,Y_Pos) //calculates using a //function using variables Message = 8+4 //change Message to a number
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B.7.4 ARRAYS An array is a collection of variables given a single name. Each variable is an element in the array. Each element in the array is referenced by its position in the array. Array names are case sensitive, so Dist[ ] and dist[ ] are different. Each element in an array can be of any data type ( oat, integer, or string). Additionally, you can reassign a value of a different type to an element that already holds a certain type. If an element has previously been assigned and it is being reassigned, it does not matter what the current value is or of what type it is, the new value will replace the old one. If the original value is an integer and the new value is a string the variable type will be changed to a string, and vice versa. The same is true for oats and integers and oats and strings. Remember the elements of the array do not all have to be of the same type. Each element can be of any type. Think of an array of mailboxes. They are collectively called MailBoxes. To access the third element from the left on the second row we would say MailBoxes[1,2]. The reason we have 1, 2 and not 2, 3 is because the rst element is 0, the second is 1, and so on.
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