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Program ow will branch to the statement immediately following the Label. The label can be on any line in the program. Be very careful using this ow control. Most of the time you can avoid using Goto statements by using good structured programming techniques with the help of the structured ow-control constructs detailed above. The main use for a Goto statement is to create loops, but it is more advisable to use repeat/until, while/wend loops and for/next loops along with Break, Continue and the appropriate if/else/endif combinations. Certain precautions must be taken if you use Goto within if/else/endif, repeat/until, while/wend, or subroutines.
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When a Goto statement is executed, the interpreter will reset any if nesting and any for/next, repeat/until, or while/wend nesting. It would be as if there are no pending if/else/endif any more and likewise no more for/next, repeat/until, or while/wend loops. So if you use a Goto within an if to go beyond the entire nested if structure you would be ok, but if you Goto within the next if/else or else/endif, etc. you will get an error. Likewise if you are within a for/next, repeat/until, or while/wend use a Goto to get out of the entire nested structure, otherwise you will get an unbalanced next/wend/until error. It is not a good idea to use Goto within looping-structures. If you must do so, make sure your program logic accounts for it. In a subroutine, try to use Goto only to branch within the subroutine. Make sure that somewhere within the subroutine a Return is eventually issued. Using Goto to get entirely out of the subroutine is legal, but beware of the logic of your program. You can use Goto to go beyond an End statement, but check your logic. Try to avoid using Goto. Use of Goto makes the program ow hard to understand, hard to follow, hard to debug, and can cause logical and semantic errors that are hard to locate. However, Goto can be useful in handling errors to redirect the program ow to one place in the code to handle all errors (but also see the OnError statement).
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See Sec. B.4 for a discussion on how commands t within the RobotBASIC language. The commands are listed here in order of functionality. An alphabetic order can be found in Sec. C.12. Commands are not case sensitive. ClearScr, clearscr, and clearSCR a re all the same. C.7.1 INPUT AND OUTPUT COMMANDS Print {Expr,Expr;Expr...} Outputs the values of Expr.... to the screen. A comma (,) between the expressions makes them print with no space between them and a semicolon (;) prints them with a tab space between them. If there are no expressions then a line feed is printed. The rst time Print is used the text will print at the top of the screen and then will print on subsequent lines until the screen is lled. When this happens the screen will scroll
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upward and the last line will always be used to print the text. See Sec. A.2 for more on this and a special feature for retrieving the text that scrolled off the screen. The color of the text is according to the current default colors. If you desire to use different colors then use the SetColor and GetColor commands. XYstring ExprN1,ExprN2,Expr3{;expr,expr;...} Outputs the result of Expr3, and so on at ExprN1, ExprN2 position on screen. A comma (,) between expressions makes them print with no spaces between them and semicolon (;) prints them with tab separation. The color of the text is according to the current default colors. If you desire to use different colors then use the SetColor command. See the GetColor and GetXY command. XYtext ExprN1,ExprN2,Expr{,ExprS{,ExprN3{,ExprN4}}} Outputs the result of Expr at ExprN1,ExprN2 position on screen. ExprS speci es the font name of the font to be assigned to the printed text. ExprN3 speci es a size and ExprN4 is a bitwise map of the style. Expr can be any valid expression that results in a number or string. If it is a number it will be converted to a string. If either ExprN1 or ExprN2 is 1 then the current corresponding X or Y screen position will be used. ExprS, ExprN3 and ExprN4 are optional. If ExprS is not speci ed or is an empty string then the default font (Courier New) will be used. If ExprN3 (Size) is not speci ed or is less than 1 then the default size will be 11. If ExprN4 (Style) is not speci ed or is 0 then no style is applied. ExprN3 is a number that speci es the size of the font. You can specify any number the system will apply the closest allowable size. ExprN4 is a bitwise map of the desired styles to be applied. You can use bit wise OR (bOr or |) the values given in the Constants help page to apply multiple styles. So for example if you want bold and italic use fs_Bold | fs_Italic. ExprS is a string that speci es the name of the font to be used. Different machines may have different fonts and if the name you specify is invalid the system will apply a default (not necessarily Courier New). To nd out what names are available on your machine use the Fonts menu option from within the Help menu on the Editor Screen. This will bring up a dialog that shows all fonts available and what sizes are available for each. You can select a font and when you exit the dialog the font s name will be copied to the clipboard. You can then use Ctlr+V to insert the name into your program. Remember different machines may not have this font. So try to choose fonts that are universally available on most machines. Many fonts do not have all the characters of the same width. These fonts will not print within a consistent width depending on the number of characters in the string, since different characters have different width. The font Courier New has all characters of the same width. Text written with a font that does not have the same width characters will be hard to line up from line to line. The text will be printed with the currently set foreground and background colors. If you desire to use different colors then use the SetColor command. Also see the GetColor and GetXY command. Beep {ExprN} Beeps the PC speaker ExprN times. If ExprN is not given only one beep will be sounded.
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