vb.net barcode reader from webcam B.6 Flow-Control Statements in Software

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B.6 Flow-Control Statements
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Flow-control statements make RobotBASIC:
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Take actions depending on a certain condition. Repeat actions a number of times. Repeat actions until a certain condition is ful lled. Repeat actions while a certain condition is ful lled.
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Go to a sub-part of the program, return from there, and continue execution from where the program branched off.
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Flow-control statements are not case sensitive, so While, WHILE, and while a re the same. Here is a simple program that shows three different ow-control structures:
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for I = 1 to 5 //forward the robot 5 pixels rForward 1 next Input Enter a number ,N if N < 5 then print too small if N > 30 then print too large while N > 0 // make the robot turn N times rTurn 1 N = N-1 wend End
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Refer to Sec. C.6 for detailed use of all the ow-control structures provided in RobotBASIC. Subroutines in RobotBASIC are created by surrounding a group of statements with a label and the command Return like this:
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SomeRoutineName: Statement Statement ... Return
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You can then, from anywhere in your program, branch off to the subroutine. The subroutine s statements will be executed and when Return is executed the program
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ow will go back to the line right after the line that called the subroutine. Here is an example:
Statement Statement ... gosub SomeRoutineName Statement Statement End SomeRoutineName: Statement Statement ... Return
See Sec. C.6 for more details on the Gosub statement and all the other ow-control statements.
B.7 Expressions
If you have used a scienti c calculator you know what expressions are. An expression is a formula that manipulates numbers, strings, or other expressions and returns a result. You can use numbers, strings, variables, constants, and/or functions in an expression (see Secs. B.7.1, B.7.2, and B.7.3 for details on each of these elements). An expression results in any of the three basic elements of RobotBASIC, an integer number, a oating-point number, or a string (see Sec. B.7.1 for details). In many statements, parameters are needed for the statement to function. Anywhere a parameter is needed, an expression can be used that would result in the correct data type required by the statement. Operators are used in an expression to manipulate the sub-parts of an expression. These operators are parenthesis, comparison operators, math operators, logical operators, and bitwise operators (for details see Sec. B.7.5). There are many functions in RobotBASIC that accept parameters and return a value. These functions can be used within expressions, are themselves expressions, and are given expressions as parameters (for details see Sec. B.7.7). B.7.1 NUMBERS Numbers are used in all computer programs. There will hardly ever be a program that does not use numbers. In RobotBASIC there are two types of numbers: Integer Numbers These are whole numbers. The range for integer numbers is from 2,147,483,648 to 2,147,483,647 For example:
Age = 46
//assigns the variable Age the //integer value 46
THE ROBOTBASIC LANGUAGE
Floating-Point Numbers These are numbers with decimal fractions. The range for oating-point numbers is from 2.23 10 308 to 1.79 10308 You can use the letter e or E with a or to indicate powers of 10 as shown in the example below. For example:
//assigns the variable Distance the oating // point value 5.78 Distance = 5.78 C = 3.1e+8 //speed of light is 310000000 m/s Mass = 0.1E-6 // Mass is 1/10000000 grams
RobotBASIC has many functions and commands that require and/or return numbers. There are functions to convert numbers and manipulate them. When an integer number is required if you pass a oat instead, the system will truncate the number into an integer by removing the decimal fraction. When RobotBASIC evaluates mathematical operations with a mixture of oats and integers the result will be a oat. However, if all the numbers involved in an expression are integers then the result will be an integer. This is especially important when performing division. For example:
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