1. 重载和有默认参数的函数:一个函数不能同时为重载和有默认参数的函数,因为在缺省参数时,系统无法知道是重载还是在使用有默认参数的函数。
2. 引用:声明一个变量的引用时,必须同时使之初始化。
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{"type":"doc","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null,"origin":null}},{"type":"paragr
{"type":"doc","content":[{"type":"blockquote","content":[{"type":"paragraph","attrs":{"indent":0,"number":0,"align":null