Swift Tutorial: Repeating Steps with Loops

aaronmu7

于 2015-12-21 20:13:22 发布

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分类专栏： Swift 2 Tutorials

本文链接：https://blog.youkuaiyun.com/u013626773/article/details/50374183

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本文详细介绍了如何使用循环和标签（如行循环、列循环）来解决编程中的复杂逻辑问题，包括计数、求和及条件判断等。通过实例展示了在不同循环结构下解决问题的方法，有助于提高代码的效率和可读性。

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*Close range: let closedRange = 0...5

Half-open range: let halfOpenRange = 0..<5

let count = 10
 
var sum = 0
for var i = 1; i <= count; i++ {
  sum += i
}

let count = 10
var sum = 0
 
for i in 1...count {
  sum += i
}

For loop

var sum = 1
 
while sum < 1000 {
  sum = sum + (sum + 1)
}

While loop

var sum = 0
 
rowLoop: for row in 0..<8 {
  columnLoop: for column in 0..<8 {
    if row == column {
      continue rowLoop
    }
    sum += row * column
  }
}

This code block makes use of labeled statements, labeling the two loops as the rowLoop and the columnLoop, respectively. When the row equals the column inside the inner columnLoop, the outer rowLoop will continue.