30 people in a class for converting and outputting the results of all students. Asked to use the language while, do-while statement and the for statement are three ways to programming.

要求针对30人的某班转换所有同学的成绩并输出。要求用while语言、do-while语句和for语句三种方法编程。
................................................................................................\2.1.cpp
................................................................................................\2.2.cpp
................................................................................................\2.3.cpp

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