文件名称:w8_7
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从用户自定义的输入文件中读取任意数目的实数，对这些数进行四舍五
入，然后把得到的整数值写到用户自定义输出文件中。确保输入文件存在，如果它不存在，
通知用户并询问是否有其他的输入文件。如果输出文件存在，询问是否删除它。如果不删除，
那么提示用另一个输出文件名。
-From the user-defined input file to read any number of real numbers, these numbers were rounded, and then get written to the integer value of the user to customize the output file. Ensure that the input file exists, if it does not exist, notify the user and ask if there are other input files. If the output file exists, ask whether to delete it. If not removed, then prompted with another output file name.
入，然后把得到的整数值写到用户自定义输出文件中。确保输入文件存在，如果它不存在，
通知用户并询问是否有其他的输入文件。如果输出文件存在，询问是否删除它。如果不删除，
那么提示用另一个输出文件名。
-From the user-defined input file to read any number of real numbers, these numbers were rounded, and then get written to the integer value of the user to customize the output file. Ensure that the input file exists, if it does not exist, notify the user and ask if there are other input files. If the output file exists, ask whether to delete it. If not removed, then prompted with another output file name.
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w8_7.m