文件名称:chengjizhuanhuan
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输入一个百分制的成绩t，将其转换成对应的等级，具体转换规则如下：
90~100为A
80~89为B
70~79为C
60~69为D
0~59为E
-Enter a percentile score t, to convert it to the corresponding level of the specific conversion rule is as follows: 90 to 100 of A 80 ~ 89 is B 70 ~ 79 is C 60 ~ 69 is D 0 ~ 59 to E
90~100为A
80~89为B
70~79为C
60~69为D
0~59为E
-Enter a percentile score t, to convert it to the corresponding level of the specific conversion rule is as follows: 90 to 100 of A 80 ~ 89 is B 70 ~ 79 is C 60 ~ 69 is D 0 ~ 59 to E
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成绩转换.cpp