9月9学习内容


let grade =100 let rank: String switch grade { case 0 ... 59: rank "F" case 60 ... 69: rank "D" case 70 ...79: rank "C" case 80 ...89: rank "B" case 90 ...100: rank "A" default: rank = "Invalid" }
用switch写分支替换if else
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大约 1 个月前
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