exit

问题 I'm having trouble at the bottom part where i am trying to set the sentinel exit key to quit.. im not sure exactly how i am supposed to do it. int number; do { Scanner Input = new Scanner(System.in); System.out.print("Enter a positive integer or q to quit program:"); number = Input.nextInt(); } while(number >= 0); do { Scanner Input = new Scanner(System.in); System.out.print("Input should be positve:"); number = Input.nextInt(); } while(number < 0); do { Scanner quit = new Scanner(System.in);

问题 In my C program, I have many data structures that are dynamically allocating memory. If the user does any of the following: Alt-F4 Clicks on the X Force quits via Task Manager, etc then my program will have a memory leak. How do I do a set on close request feature so I can clean up my global variables before my program is shut down unnaturally? 回答1: (Your terminology strongly suggests a Windows-specific application so I have written this answer accordingly. On other modern operating systems,

问题 In my C program, I have many data structures that are dynamically allocating memory. If the user does any of the following: Alt-F4 Clicks on the X Force quits via Task Manager, etc then my program will have a memory leak. How do I do a set on close request feature so I can clean up my global variables before my program is shut down unnaturally? 回答1: (Your terminology strongly suggests a Windows-specific application so I have written this answer accordingly. On other modern operating systems,

问题 I need to schedule a python script which can exit and kill it self at a given time. For scheduling, I am using python schedule and below is the code: import schedule from threading import Thread import time import sys def exit_data(): print("Exiting") sys.exit() def exit_data_thread(): schedule.every().day.at('13:20').do(exit_data) while True: schedule.run_pending() time.sleep(1) def main(): Thread(target=exit_data_thread).start() while True: time.sleep(1) main() Function exit_data() runs at

问题 Heres the scenario I have a password that must be entered if entered wrong the script will not proceed and just exit itself? But how can I tell the script to safely exit itself? I tried sys.exit() but that gives a traceback error and doesn't seem like a very clean exit method. 回答1: In fact, sys.exit() will only throw a SystemExit exception, which would make the program exit if this exception wasn't catched, but I don't think it's poor coding. Anyway, another possibility is to use os._exit(0)

问题 I feel like an idiot asking this but is doing quit() the best way to terminate a python programme? Or is there a better way that could gradually stop all while True loops ect instead of just instantly stopping it all? Once again, I feel like an idiot asking this but I'm just curious. 回答1: I don't know why you don't want to use quit() but you can use this: import sys sys.exit() Or this: raise SystemExit(0) To halt a while loop you can use the break statement. For example: while True: if True:

问题 I have a simple function written to check for directories: :direxist if not exist %~1 ( echo %~1 could not be found, check to make sure your location is correct. goto:end ) else ( echo %~1 is a real directory goto:eof ) :end is written as :end endlocal I don't understand why the program would not stop after goto:end has been called. I have another function that uses the same method to stop the program and it work fine. :PRINT_USAGE echo Usage: echo ------ echo <file usage information> goto

问题 I have a program that does some data analysis and is a few hundred lines long. Very early on in the program, I want to do some quality control and if there is not enough data, I want the program to terminate and return to the R console. Otherwise, I want the rest of the code to execute. I've tried break , browser , and quit and none of them stop the execution of the rest of the program (and quit stops the execution as well as completely quitting R, which is not something I want to happen). My

问题 I have a program that does some data analysis and is a few hundred lines long. Very early on in the program, I want to do some quality control and if there is not enough data, I want the program to terminate and return to the R console. Otherwise, I want the rest of the code to execute. I've tried break , browser , and quit and none of them stop the execution of the rest of the program (and quit stops the execution as well as completely quitting R, which is not something I want to happen). My

来源： https://stackoverflow.com/questions/21415696/python-detect-kill-request