This is my updated answer (thanks to Martin R and the OP for the remarks). The OP's problem was just casting the pow(x: Decimal,y: Int) -> Decimal function to an Int after subtracting 1 from the result. I have answered the question with the help of this SO post for NSDecimal and Apple's documentation on Decimal. You have to convert your result to an NSDecimalNumber, which can in turn be casted into an Int:
let size = Decimal(2)
let test = pow(size, 2) - 1
let result = NSDecimalNumber(decimal: test)
print(Int(result)) // testing the cast to Int
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This is my updated answer (thanks to Martin R and the OP for the remarks). The OP's problem was just casting the pow(x: Decimal,y: Int) ...
2016年11月8日 ... var totalCost = lround(mead + mead * Double(tip) / 100.0 + mead * Double(tax) / 100.0)1，直接截去小数部分转换成整数使用强制转换会将浮点 ...
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Jan 18, 2018 ... public init(floatLiteral value: Double) { self.init(value) } }. extension Decimal : ExpressibleByIntegerLiteral { public init(integerLiteral value: Int) {
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将您的号码转换为字符串，以后将单独的字符串从。 试试这个： - let number:Float = 123.46789 let numberString = String(number) let numberComponent = ...
2017年3月2日 ... 向上取整：float ceilf(float); double ceil(double); 向下取整：float floorf(float); double floor(double); 四舍五入：f.
Int does not have an initializer taking Decimal , so you cannot convert Decimal to Int directly with an initializer syntax like Int(...) . You can use ...
Creates a new decimal value exactly representing the provided integer. init(Int). Creates and initializes a decimal with the provided integer value.
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You could do simple floor and truncating: let value = 1234.56789 let double = floor(value) // 1234.0 let integer = Int(double) // 1234 let decimal ...
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Why pow does not simply work on Int ? What is the real use of Decimal ? In fact, I wanted to add an integer power operator as : infix operator ** { associativity ...