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ExprN (or srt row if ExprN is not given). The elements in a row must be the same data type, but the elements in a column can be of different data types. This can be helpful in creating databases, where the elements in a column are the different elds of the database and each column is a record.
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data a; Sam , Ted , Pam , Tom //names data a;45 ,55 ,20 ,10 //ages data a;30045,30067,30045,20022 //zip codes dim b[3,4] //make a 2-d array to hold data mcopy a,b //copy the data into it msort b //sort data by name //a subroutine to display the data in a good format gosub print_data msort b,2 //sort data by zipcode gosub print_data msort b,1 //sort data by age gosub print_data msort b,0 //sort data by name again gosub print_data
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C.7.5 OTHER COMMANDS DebugOn DebugOff Debug {Expr1,Expr2;Expr3...} Outputs the values of Expr... to the Debugging Screen. This only happens if the DebugOn command has been issued any prior time, or the Debug On button has been pressed on the Terminal Screen. The DebugOff command will turn debugging off again. The Debug Screen will pause program execution and display the result of Expr... and wait for you to press the Step button to execute the rest of the program. If Debug{} is in a loop it will be executed every time the command line is encountered. To stop any further execution use the Debug Off button on the Debug Screen. This is the same as issuing a DebugOff command, or you can close the Debug window using the close window icon on the top-right corner. This is the same as pressing the Debug Off button. To remain in debug mode press the Step button. To eliminate any further program pausing and debugging press the Debug Off button, close the debug window or issue a DebugOff command within the program code. To turn on further debugging you must issue a DebugOn command again within the program ow, or press the Debug On button on the bottom-right side of the Terminal Screen. This button turns debugging on at any time during the program ow as if a DebugOn command was executed. Subsequently any Debug command will be executed. This can be useful to turn the debugging on at a certain stage in the program rather than having to step through until you get to a point of interest. If you keep the Debug{} lines in the program but do not wish them executed next time you run the program, make sure that the command DebugOff is issued before any Debug{} is issued or that any prior DebugOn commands are commented out. {Expr1,Expr2;Expr3...} are printed as described in the Print command above. This combination of commands can help you step the program and view the values of variables while doing so. The Clear button on the Debug Screen clears any previous printed debug data. Every time you run the program from the start the Debug Screen is cleared.
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You can swap windows back and forth between the Editor/Terminal/Debug windows. Delay {ExprN} Causes a delay in milliseconds that is, 1000 = 1 second. If ExprN is not given 1000 will be assumed that is, 1 second. MicroDelay {ExprN} Causes a delay in steps of 15 microseconds. So, for example, to get a delay of 1 second you would issue the statement MicroDelay (1.0e6)/15. Notice that you can use a oating-point number. Since the ticks are in intervals of 15 microseconds a value of 2 will make a delay of 30 microseconds. ExprN is optional and if it is not given or is less than 1 then it is assumed to be 1. This means that the minimum delay is 15 microseconds. Swap Var1,Var2 Swaps the values of Var1 and Var2 the variables can be of different types. GetError VarN1{,VarS{,VarN2{,VarN3}}} Will ll the variable VarN with the last error number (-1 if no error), VarS will be lled with the description of the error (blank if no error), VarN2 will be assigned the line number where the error occurred ( 1 if no error) and VarN3 will be assigned the character number in the line where the error occurred ( 1 if no error). Issuing this command will retrieve the details of the last error to have occurred and then will clear the data. If an error occurs and you do not issue this command then another error occurs, issuing this command will get the details of the last error, the previous details will not be retrievable. If an error occurs and you have not issued an OnError Label (see Sec. C.6.10) statement then the error will halt the program and you won t be able to use this command. C.7.6 DRAWSHAPE DETAILS DrawShape ExprS,ExprN2,ExprN3{,ExprN4,ExprN5}
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This command will draw an image speci ed by the string in ExprS. ExprN2 and ExprN3 are screen position x, y. Optional ExprN4 and ExprN5 are to specify a scale factor (pixels) and color, correspondingly. If scale is not given then 1 is assumed and if color is not given the default pen color is used. If you are to specify the color you must specify the scale. If color is a negative number then the color will be the background color. This is handy in appearing to erase the image. The data in ExprS indicates how to move (LineTo) from the x, y position. ExprS contains a list of letters UDLRQAWS or udlrqaws and 0123456789 . Where U=up, D=down, L=left, R=right, Q=diagonal to left and up, W=diagonal to right and up, A=diagonal to left and down, and S=diagonal to right and down. If lowercase letters are used then drawing and moving will take place. If uppercase letters are used then only moving will take place. Starting at the coordinate (ExprN2,ExprN3) the interpreter will draw a line to the next pixel (or ExprN4 pixels) up/down, and so on if the letter used is lower case. If it is upper case it will move to the position instead of drawing a line, and the next letter will cause drawing or moving from that new position.
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