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      1. 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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