How do I make a C console program exit

Question

Is there a line of code that will terminate the program    Something like python s sys exit

User · Answer

This SO post provides an answer as well as explanation why not to use exit(). Worth a read.

In short, you should return 0 in main(), as it will run all of the destructors and do object cleanup. Throwing would also work if you are exiting from an error.

User · Answer

else if Decision  gt   3        exit 0

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Allowing the execution flow to leave main by returning a value or allowing execution to reach the end of the function is the way a program should terminate except under unrecoverable circumstances   Returning a value is optional in C    but I typically prefer to return EXIT SUCCESS found in cstdlib  a platform-specific value that indicates the program executed successfully     include  lt cstdlib gt   int main int argc  char  argv              return EXIT SUCCESS      If  however  your program reaches an unrecoverable state  it should throw an exception   It s important to realise the implications of doing so  however   There are no widely-accepted best practices for deciding what should or should not be an exception  but there are some general rules you need to be aware of   For example  throwing an exception from a destructor is nearly always a terrible idea because the object being destroyed might have been destroyed because an exception had already been thrown   If a second exception is thrown  terminate is called and your program will halt without any further clean-up having been performed   You can use uncaught exception to determine if it s safe  but it s generally better practice to never allow exceptions to leave a destructor   While it s generally always possible for functions you call but didn t write to throw exceptions  for example  new will throw std  bad alloc if it can t allocate enough memory   it s often difficult for beginner programmers to keep track of or even know about all of the special rules surrounding exceptions in C     For this reason  I recommend only using them in situations where there s no sensible way for your program to continue execution    include  lt stdexcept gt   include  lt cstdlib gt   include  lt iostream gt   int foo int i      if  i    5        throw std  runtime error  foo  i is not 5           return i   2     int main int argc  char  argv        try       foo 3         catch  const std  exception  amp e        std  cout  lt  lt  e what    lt  lt  std  endl      return EXIT FAILURE        return EXIT SUCCESS      exit is a hold-over from C and may result in objects with automatic storage to not be cleaned up properly   abort and terminate effectively causes the program to commit suicide and definitely won t clean up resources   Whatever you do  don t use exceptions  exit  or abort terminate as a crutch to get around writing a properly structured program   Save them for exceptional situations

User · Answer

exit 0      at the end of main function before closing curly braces

User · Answer

if you are in the main you can do     return 0      or    exit exit code     The exit code depends of the semantic of your code  1 is error 0 e a normal exit   In some other function of your program     exit exit code      will exit the program

User · Answer

Yes   exit     It s in  lt cstdlib gt

User · Answer

include  lt cstdlib gt      exit  exit code

User · Answer

throw back to main which should return EXIT FAILURE   or std  terminate   if corrupted    from Martin York s comment

User · Answer

In main    there is also   return 0

User · Answer

simple enough     exit   0       end of function  Make sure there is a space on both sides of the 0  Without spaces  the program will not stop

User · Answer

While you can call exit    and may need to do so if your application encounters some fatal error   the cleanest way to exit a program is to return from main     int main            do whatever your program does       function returns and exits program   When you call exit    objects with automatic storage duration  local variables  are not destroyed before the program terminates  so you don t get proper cleanup   Those objects might need to clean up any resources they own  persist any pending state changes  terminate any running threads  or perform other actions in order for the program to terminate cleanly

User · Answer

include  lt cstdlib gt        wherever you want it to end  e g  in an if-statement    if  T    0    exit 0

User · Answer

There are several ways to cause your program to terminate  Which one is appropriate depends on why you want your program to terminate  The vast majority of the time it should be by executing a return statement in your main function  As in the following   int main          f         return 0      As others have identified this allows all your stack variables to be properly destructed so as to clean up properly  This is very important   If you have detected an error somewhere deep in your code and you need to exit out you should throw an exception to return to the main function  As in the following   struct stop now t      void f                        if  some condition               throw stop now t                    int main          try             f           catch  stop now t amp  stop              return 1              return 0       This causes the stack to be unwound an all your stack variables to be destructed  Still very important  Note that it is appropriate to indicate failure with a non-zero return value   If in the unlikely case that your program detects a condition that indicates it is no longer safe to execute any more statements then you should use std  abort    This will bring your program to a sudden stop with no further processing  std  exit   is similar but may call atexit handlers which could be bad if your program is sufficiently borked

[c++] How do I make a C++ console program exit?

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