9月9学习内容

swift

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 3 年前

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