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            筆試題main 主函數

            時間:2020-10-18 15:52:24 筆試題目 我要投稿

            筆試題(main 主函數)

            main 主函數執行完畢后,是否可能會再執行一段代碼,給出說明?

            筆試題(main 主函數)

            答案:可以,可以用_onexit 注冊一個函數,它會在main 之后執行int fn1(void), fn2(void), fn3(void), fn4 (void);

            void main( void )

            {

            String str("zhanglin");

            _onexit( fn1 );

            _onexit( fn2 );

            _onexit( fn3 );

            _onexit( fn4 );

            printf( "This is executed first.\n" );

            }

            int fn1()

            {

            printf( "next.\n" );

            return 0;

            }

            int fn2()

            {

            printf( "executed " );

            return 0;

            }

            int fn3()

            {

            printf( "is " );

            return 0;

            }

            int fn4()

            {

            printf( "This " );

            return 0;

            }

            The _onexit function is passed the address of a function (func) to be called when the program terminates normally. Successive calls to _onexit create a register of functions that are executed in LIFO (last-in-first-out) order. The functions passed to _onexit cannot take parameters.

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