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      1. main 主函數(shù)執(zhí)行完畢后,是否可能會再執(zhí)行一段代碼

        時間:2020-11-23 18:04:42 筆試題目 我要投稿

        main 主函數(shù)執(zhí)行完畢后,是否可能會再執(zhí)行一段代碼

          答案:可以,可以用_onexit 注冊一個函數(shù),它會在main 之后執(zhí)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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