题目：利用条件运算符的嵌套来完成此题：学云计习成绩>=90分的同学用A表示，60-89算开分之间的用B表示，60分以下的用C表示。
程发：序分析：程序分析：(a>b) ? a:b 这是条Py件运算符的基本例子。
程序源代码：
以上实例th输出结果为：
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