文件名称:paifenshu
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利用条件运算符的嵌套来完成此题：学习成绩>=90分的同学用A表示，60-89分之间的用B表示,60分以下的用C表示。
-Use conditions operator nested to complete the topic: study result > = 90 points with A classmate, said 60-89 points with B between said, below the 60 points with C said.
-Use conditions operator nested to complete the topic: study result > = 90 points with A classmate, said 60-89 points with B between said, below the 60 points with C said.
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