Turbo Basic

• Bounds• Overflow• Stack test8087 requiredTum on this option when you're using an 8087 coprocessor chip for program execution.With this option on, Turbo Basic generates the best possible code for Hoatingpointoperations, both fast·and compact, using inline 8087 statements. The disad~vantage is that a program generated with this option on won't run on a machinewithout an 8087.With the 8087 option off {the default), programs can go both ways; that is, if an8087 is available, the program will use it. If not, the program will use softwareroutines to accomplish the same thing (albeit more slowly).Note: In some cases, a program will read that your machine has an 8087 chipwhen it really doesn't; for example, if you've set the switch on for 8087 but have yetto install the chip. This will either cause Turbo Basic to hang when running aprogram or to generate compile-time errors when compiling. Environment variablessolve this problem nicely. Add the following to your AUTOEXEC.BAT file:SET87=noTake a look at Appendix G, "A DOS Primer," for more information on environmentvariables and AUTOEXEC.BAT files.Keyboard break .If you want to interrupt a program with Ctrl-Break, tum this option on. Note thatthis applies to Ctrl-Break only, not Ctrl-C; Ctrl-C cannot interrupt a Turbo Basic program.Keep in mind that interrupting a program with Ctr/~Break is final-there isno way to continue execution later.It is also important to note that Ctrl-Break doesn't take effect until.the programoutputs text (not graphics) to the screen or printer or performs keyboard input.This means that you cannot interrupt sequences that don't perform I/O; for example:TightLoop: GOTO TightLoopruns until you reset the system. (However, to save you from this tight loop problem,we have equipped Turbo Basic with an Auto save edit option. In other words, youcan set this option on so that if you need to exit from a program by rebooting, youcan still manage to save your program. Refer to "The Setup Menu.")You can use the follOwing options for trapping certain types of run-time errors.Normally, when a program is in the development phase, you'll want all of theseoptions turned on so that you can catch any problems. When your program isdebugged, turn these options off to generate a final program version that is fasterand requires less memory.Turbo Basic: The Program 49