@ -199,7 +199,7 @@ let c = a++ // a 现在 2, 但 c 是 a 自增前的值 1
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```swift
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let three = 3
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let minusThree = -three // minusThree 等于 -3
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let plusThree = -minusThree // plusThree 等于 3, o或 "负负3"
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let plusThree = -minusThree // plusThree 等于 3, 或 "负负3"
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```
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单目负号写在操作数之前, 中间没有空格.
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