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(or Dim). The rst element in the array will be used as a title (on the bord e r frame of the box) to the dia log; it will not show inside the box with the re s t a of the text. The box will be centered on the screen and will be as wide as needed to display the longest line of text, but will not be wider than the screen. If the box is narrower than any line the line will wrap around. Also there is a scroll bar to scroll the text in the vertical direction. See the Commands help page for more user interaction commands Also see the TextBox() and ErrMsg() functions in the Functions Part II help page. Example:
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Data msg; this is a test message box. , Data msg; the next lines are numerical data displayed as text Data msg;-1,3,5.2,6.1e12 Data msg; , this is the end. n = MsgBox(msg) if n print OK else print Cancel endif
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C.8.13 OTHER FUNCTIONS Within(ExprN1,ExptN2,ExprN3) Checks to see if ExprN1 is within the range ExprN2 to ExprN3 inclusive. All the numbers can be oats or integers. If ExprN2 is greater than ExprN3 they are swapped to do the checking. The function returns 1 (true) if ExprN1 >= ExprN2 AND ExprN1 <= ExprN3 otherwise it returns 0 (false). The swapping is internal and does not affect the parameters. Evaluate(ExprS) ExprS is a string that contains a valid expression (see Sec. B.7 for de nition of expressions). Depending on the context you can use variables. But these must be existing variables for the evaluator to be able to evaluate the expression correctly. This can be useful when expressions are de ned at runtime instead of design time. For example say you are writing a function plotter. Further, you want the user to de ne the function to be plotted at runtime. The user would enter a string in response to an Input command, for example, sin(x). The programmer can then loop through all values in the desired range of x and evaluate the expression given by the user as y = Evaluate(ExprS) where ExprS was given by the user as f(x).
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Input Enter f(x) ,fx for x = 0 to 10 y = Evaluate(fx) print y next End
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If an error is encountered while evaluating the function given by the user an error message is displayed indicating the error, and Evaluate will return the ExprS as it was, that is, if ExprS is not a valid expression the Evaluate(ExprS) function will display an error
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APPENDICES
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message and return the original input without evaluation. This allows the user to check if the return result is still the same as the input then execute any error handling within the program. The error message given by the interpreter is meaningful in that it indicates the type of error, but the line number will always be 0 because ExprS is just one line any way. KeyDown(ExprN) The commands WaitKey, GetKey and GetKeyE allow you to obtain the code for the last key pressed. However, it may become necessary to test if a certain combinations of keys are pressed. Say you want to re retrorockets horizontally and vertically and allow both at the same time. If you use the above commands the program will only be able to detect the last key pressed and thus if the user presses both the Up and Left Arrow keys together the commands will only report the code of the last key pressed. Also see the Constants help page in the IDE for handy constants that represent various key codes. Using this function you can interrogate each key separately to see if it is pressed down or not. There are 255 keys on the keyboard and you can nd out the state of each separately using this function. For instance, if you want to nd out if the up arrow key is pressed and also at the same time the left arrow key then you would have a statement like
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