本实验是根据老师给的课件完成的，整个实验的思路是这样的：先设计三中文件读写模式，每种读写模式中首先从源文件中读取数据，然后在对数据进行某些操作，比如：移位等，接着再写到目标文件中。由于每次读写所用的时间具有一定的随机性，为了比较准确地比较各种模式的读写时间，程序中对每种读写模式都进行了十次操作，然后再得到每种模式的平均读写时间，之后再进行比较。-The experiment is based on the teacher to complete the courseware, the whole train of thought experiment is this: read and write files in the first design three models, each model in the first read-write to read data from the source file, and then some in the data operations, such as: shift, etc., then re-write the destination file. As the time taken by each reader has a certain randomness, in order to more accurately compare the various modes of reading and writing time for each program are read and write mode operation carried out 10 times and then get the average of each mode reading and writing time, followed by the comparison.