如何使用NSDecimalNumber获得除法的整数和模（mod） [英] How do you get the int and modulo (mod) of division with an NSDecimalNumber

问题描述

我对NSDecimalNumber及其行为感到困惑。我有一个NSDecimalNumber，代表一个美元值，例如$ 37.50。我想找出5.0表示该数字有多少次，然后知道还剩下多少。我可以得到直除法并得到7.50，但我想得到7 mod 2.50。我可以转换为整数，但需要保存美分，所以想知道框架中是否有技巧吗？

I am confused by NSDecimalNumber and its "behaviors". I have an NSDecimalNumber that represents a dollar value, say $37.50. I'd like to find out how many times say 5.0 goes into that number and then know what's left over. I can get the straight division and get 7.50 but I want 7 mod 2.50. I could convert to an integer but need to save the "cents" so wondering if there's some tricks in the framework?

推荐答案

使用彼得·霍西（Peter Hoseys）的例子，但使用iOS代码：

Using Peter Hoseys example, but with iOS code:

NSDecimalNumber *dividend = [NSDecimalNumber decimalNumberWithDecimal:[[NSNumber numberWithDouble:37.5] decimalValue]];

NSDecimalNumber *divisor = [NSDecimalNumber decimalNumberWithDecimal:[[NSNumber numberWithDouble:5.0] decimalValue]];

NSDecimalNumber *quotient = [dividend decimalNumberByDividingBy:divisor withBehavior:[NSDecimalNumberHandler decimalNumberHandlerWithRoundingMode:NSRoundDown scale:0 raiseOnExactness:NO raiseOnOverflow:NO raiseOnUnderflow:NO raiseOnDivideByZero:NO]];

NSDecimalNumber *subtractAmount = [quotient decimalNumberByMultiplyingBy:divisor];

NSDecimalNumber *remainder = [dividend decimalNumberBySubtracting:subtractAmount];

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