已采纳回答 / qq_黄小林_0
这里不是指协议函数返回的值是false ，bool是一个结构体 在申明的时候 /// Creates an instance initialized to `false`.就是false
2018-11-22
最新回答 / qq_慕神1420022
已提供，可以去课程里下载http://house.china.com.cn/sousou/%25101%253D%252C%2520%25%43%43%25%44%41%25%43%31%25%46%41%25%44%33%25%45%39%25%43%30%25%44%36%25%42%33%25%41%31%25%42%46%25%41%41%25%42%42%25%41%37%25%35%38%25%35%33%25%33%36%25%33%38%25%33%36%25%32%45%25%36%33...
2017-11-22
已采纳回答 / hdadan
precedencegroup ComparativePrecedence{ //定义运算符优先级 associativity: right higherThan: LogicalConjunctionPrecedence}infix operator ** : ComparativePrecedencefunc **(x: Double, p:Double) -> Double{ return pow(x,p)}
2017-03-11