- A highly structured set of procedures that allows a user to specify certain conditions within an executing program that will result in a transfer of control from the normal program sequence to a specified routine.; 一组高度结构化的过程,它允许用户在一执行中的程序内规定某些条件,这些条件将导致CPU控制权从正常 程序序列转移到某一给定例行程序。
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