The difference between call by value and result an

原创于 2008-08-26 16:53:08 发布 · 184 阅读

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本文探讨了在程序设计中，调用子程序时采用的值传递和引用传递的区别，尤其是在子程序异常终止的情况下这两种方式的不同表现。文章指出，在子程序通过错误消息或STOP语句异常终止时，值传递和引用传递会导致不同的结果。

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The difference between call by value and result and call by reference lies in the time at which the values are passed back. Call by value and result and call by reference will cause different results if the subroutine terminates abnormally. This only occurs if an error message is output (MESSAGE Ennn) or when a STOP statement occurs. This causes the subroutine processing to be terminated immediately and the ENDFORM statement is not executed. However, if you leave the subroutine via the CHECK < expression> or EXIT statements, the parameters are passed back , since the subroutine is exited via ENDFORM in these cases.