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The suggestion to "use SYSTEM instead of END" is suspicious. SYSTEM spawns the system shell as a sub-process. If one would EXIT from the spawned command.com/cm
by knz42 8y ago
The suggestion to "use SYSTEM instead of END" is suspicious.
SYSTEM spawns the system shell as a sub-process. If one would EXIT from the spawned command.com/cmd.exe, QBASIC would pop up back. I think a user of programs written in this way would find themselves surprised.
- iforgotpassword 8y agoThis is not true, system quits basic. In gwbasic this was unconditional since there was no ide, in qbasic it works if you used /run to start the program right away, otherwise system is equivalent to end and just drops you back into the ide.
- psuter 8y agoIt was definitely a little confusing, as there seems to be many ways of exiting. From the QBasic docs in the IDE: END: Ends a program, procedure, block, or user-defined data type. [...] If no argument is supplied, END ends the program and closes all files. STOP: Halts a program. SYSTEM: Closes all open files and returns control to the operating system. You may be thinking of: SHELL: Suspends execution of a Basic program to run a DOS command or batch file.
- bitwize 8y agoSYSTEM with no arguments exited BASIC. SYSTEM with a string argument on some Microsoft BASICs spawned a shell that ran the command in the argument. On others, the SHELL command did this. (iirc mbasic on xenix used SHELL, GWbasic used SYSTEM with an argument.)