这个程序接受一个操作码和一个记录键作为输入，然后读取VSAM数据集并将记录返回给CICS。

This program accepts an operation code and a record key as inputs, then reads the VSAM dataset and returns the record back to CICS.

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散列码是一个整数，应该对每个键返回唯一的数字。

The hash code is an integer that should return a unique number of each unique key.

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散列码应该在键空间上提供均匀的值分布，以便分区负载平衡。

The hash code should provide a uniform distribution of values over the key space so that the partitions are evenly balanced.

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