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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/thread/../program/exit.html below:

exit - cppreference.com

void exit( int exit_code );

_Noreturn void exit( int exit_code );

[[noreturn]] void exit( int exit_code );

Causes normal program termination to occur.

Several cleanup steps are performed:

• functions passed to atexit are called, in reverse order of registration
• all C streams are flushed and closed
• files created by tmpfile are removed
• control is returned to the host environment. If exit_code is zero or EXIT_SUCCESS, an implementation-defined status indicating successful termination is returned. If exit_code is EXIT_FAILURE, an implementation-defined status indicating unsuccessful termination is returned. In other cases implementation-defined status value is returned.

The functions registered with at_quick_exit are not called.

The behavior is undefined if a program calls exit more than once, or if it calls exit and quick_exit

The behavior is undefined if during a call to a function registered with atexit, the function exits with longjmp.

Returning from the the main function, either by a return statement or by reaching the end of the function, executes exit(), passing the argument of the return statement (or ​0​ if implicit return was used) as exit_code.

(none)

Possible output:

error opening file data.txt in function main()

• C17 standard (ISO/IEC 9899:2018):

• 7.22.4.4 The exit function (p: 256)

• C11 standard (ISO/IEC 9899:2011):

• 7.22.4.4 The exit function (p: 351-352)

• C99 standard (ISO/IEC 9899:1999):

• 7.20.4.3 The exit function (p: 315-316)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.10.4.3 The exit function

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