Why should the file be opened in I-O mode when it is being used for REWRITE purposes?

Why should the file be opened in I-O mode when it is being used for REWRITE purposes?

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: easy

标签: interviewbit, cobol, topic-specific, mainframe

参考答案摘要

When the file REWRITE of the record needs to be performed, the file should first be opened and then the record must be read from the file. This is why the file should always be opened in I-O mode.

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