Use of exit function

Question

I want to know how and when can I use the exit   function like the program in my book    include lt stdio h gt   void main         int goals      printf  enter number of goals scored        scanf   d   amp goals        if goals lt  5          goto sos      else               printf  hehe            exit               sos      printf  to err is human        When I run it  it shows ERROR  call to undefined function exit     Also  I want to know how I can create an option to close the window in which the program runs  For example  I made a menu-driven program which had several options and one of them was  exit the menu   How can I make this exit the program  i e  close the window

User · Answer

Write header file  include lt process h gt  and replace exit    with exit 0    This will definitely work in Turbo C  for other compilers I don t know

User · Answer

The exit   function is a type of function with a return type without an argument  It s defined by the stdlib header file   You need to use   exit 0  or exit EXIT SUCCESS   or   exit non-zero  or exit EXIT FAILURE

User · Answer

exit int code   is declared in stdlib h so you need an   include  lt stdlib h gt    Also  - You have no parameter for the exit    it requires an int so provide one  - Burn this book  it uses goto which is  for everyone but linux kernel hackers  bad  very  very  VERY bad   Edit  Oh  and  void main     is bad  too  it s   int main int argc  char  argv

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In addition to return an exit code to parent process -   In UNIX  an important aspect that I think has been left out is  that exit   at first calls  in reverse order  all those functions  which were registered by atexit   call   Please refer to SUSv4 for details

User · Answer

Include stdlib h in your header  and then call abort    in any place you want to exit your program  Like this   switch varName        case 1        blah blah      case 2       blah blah      case 3       abort        When the user enters the switch accepts this and give it to the case 3 where you call the abort function  It will exit your screen immediately after hitting enter key

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Try man exit     Oh  and    include  lt stdlib h gt   int main void                    if  error occured        return  EXIT FAILURE                       return  EXIT SUCCESS

User · Answer

The following example shows the usage of the exit   function    include  lt stdio h gt   include  lt stdlib h gt   int main void        printf  Start of the program     n        printf  Exiting the program     n        exit 0       printf  End of the program     n        return 0      Output     Start of the program        Exiting the program

User · Answer

Use process h instead of stdlib and iostream    It will work 100

User · Answer

Try using exit 0   instead  The exit function expects an integer parameter  And don t forget to  include  lt stdlib h gt

User · Answer

The exit function is declared in the stdlib header  so you need to have   include  lt stdlib h gt    at the top of your program to be able to use exit   Note also that exit takes an integer argument  so you can t call it like exit    you have to call as exit 0  or exit 42   0 usually means your program completed successfully  and nonzero values are used as error codes   There are also predefined macros EXIT SUCCESS and EXIT FAILURE  e g  exit EXIT SUCCESS

User · Answer

Bad programming practice  Using a goto function is a complete no no in C programming  Also include header file stdlib h by writing  include  lt iostream h gt for using exit   function  Also remember that exit   function takes an integer argument   Use exit 0  if the program completed successfully and exit -1  or exit function with any non zero value as the argument if the program has error

User · Answer

You must add a line with  include  lt stdlib h gt  to include that header file and exit must return a value so assign some integer in exit any integer

User · Answer

on unix like operating systems exit belongs to group of system calls  system calls are special calls which enable user code  your code  to call kernel code  so exit call makes some OS specific clean-up actions before returning control to OS  it terminates the program    include  lt stdlib h gt      example 1 int main int argc  char  argv     exit EXIT SUCCESS         example 2 int main int argc  char  argv     return 0      Some compilers will give you the same opcode from both of these examples but some won t  For example opcode from first function will not include any kind of stack positioning opcode which will be included in the second example like for any other function  You could compile both examples and disassemble them and you will see the difference   You can use exit from any part of your code and be sure that process terminates  Don t forget to include integer parameter

[c] Use of exit() function

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