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C.2 Assignment Statement
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See Sec. B.3 for detailed information about the assignment statement. A few more details are provided here. In RobotBASIC you do not have to specify the data type of a variable. The type of the variable is determined by the data that is stored in it. Also the type of a variable can change if you reassign a different type value to it. Variable names cannot include %, $, or # as in other BASIC implementations. You cannot use these characters as part of variable names. These characters are used as operators (see Sec. B.7.5). RobotBASIC has a powerful array structure compared to other programming languages. In addition to a versatile Data command, you can have almost limitless (only limited by memory) dimensional arrays and limitless elements in each dimension. Additionally, each element in the array can be any of the three types in RobotBASIC (strings, integers, and oats). Any of the elements can be assigned and reassigned any of the types. You can manipulate and perform operations on arrays that include inversion, multiplication, and so on. There is also a set of statistical operations like variance, regression, and more. The assignment statement is used to set the value of a variable or an array element like this:
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Var = Expr (a variable name followed by an equal sign (=) then an expression)
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VarA[ExprN{,ExprN....] = Expr (an array name[element speci cation] followed by an equal sign [=] then an expression)
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A variable does not have to be speci ed prior to assignment, but if you use this format a = a 4 then the variable must be previously speci ed because otherwise the interpreter will not know what the original value was and an error will occur.
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APPENDICES
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If the resulting expression is a string, integer, or oat the variable will be created and assigned that value and type. If the variable already exists but is of a different type and/or value it will be erased and assigned the new type and value. The array must have been created using the Dim or Data command. The element speci cation must be legal for the array dimension speci ed in the Dim command (see array commands in Sec. C.7). The array element is treated as if it is a variable name and the above information regarding variables is applicable.
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C.3 Expressions
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See Sec. B.7 for details on expressions and what constitutes an expression. A few additional details are given here. Expressions can contain previously assigned variables and/or array elements. If an array element is speci ed then it must have been assigned and be within the range of the array s dimensional constraints as speci ed in the Dim command. Expressions can also contain functions (see Sec. C.8). Expressions can also contain bitwise, logical, comparison, and math operators (see Sec. B.7.5)
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print sin(4+5/3.0)*(3|4)+ ((a>b)&(c < 5)) n = this{ +b+ } = +c
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NOTE:
If all the numbers involved in an expression are integers the result will be an integer. If any of the numbers is a oat then the result will be oat.
B = sin(pi(2*Theta^2))/(3+4*Acceleration)
Even though all the numbers are integer the result is still oat because Sin() returns a oat.
C.4 Strings
See Sec. B.7.2 for details about strings. A few more details are given here. You can add two strings (concatenation)
temp = test + ing
//temp will be testing
You can add a string and a variable that is string
temp = test print I m +temp+ ing
//will print I m testing
You can add a string and a number as long as the string resulting expression comes before the number. The number will be converted to a string. Use the ToString() function to do the same thing regardless of order.
a = 12.3 b = Result = c = b+a print The +c
//prints The Result = 12.3
COMMANDS, FUNCTIONS, AND OTHER DETAILS
print print print print
The ,b,a //prints The Result = 12.3 The ,b+a //prints The Result = 12.3 The ,b+ToString(a) //prints The Result = 12.3 a+b //Gives An Error
You can compare two strings for equality. But be careful about > and < since upper and lower case letters will affect the result. You can also use the $ operator
if tin $ testing then print yes //prints yes //ExprS1 $ ExprS2 will test to see if ExprS1 //occurs within ExprS2
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