如何将字符串转换为双精度，反之亦然? [英] How to convert a string into double and vice versa?

问题描述

我想将字符串转换为双精度值，然后对其进行一些数学运算，然后将其转换回字符串.

I want to convert a string into a double and after doing some math on it, convert it back to a string.

我如何在 Objective-C 中做到这一点?

How do I do this in Objective-C?

有没有办法将双精度四舍五入到最接近的整数?

Is there a way to round a double to the nearest integer too?

推荐答案

您可以使用

double myDouble = [myString doubleValue];

四舍五入到最近的整数可以这样完成

Rounding to the nearest int can then be done as

int myInt = (int)(myDouble + (myDouble>0 ? 0.5 : -0.5))

老实说，我不确定是否有比

I'm honestly not sure if there's a more streamlined way to convert back into a string than

NSString* myNewString = [NSString stringWithFormat:@"%d", myInt];

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