xcode 如何在目标 C 中将浮点数格式化为 2 位小数
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How to format float to 2 decimals in objective C
提问by Raphael Caixeta
I have a string that I'm converting to a float that I want to check for values in an if statement.
我有一个要转换为浮点数的字符串，我想检查 if 语句中的值。
The original float value is the iPhone's trueHeading that is returned from the didUpdateHeading method. When I convert the original float to a string using @"%.2f" it works perfectly, but what I'm trying to do is convert the original float number to the same value. IF I just convert the string to [string floatValue] I get the same original float number, and I don't want that.
原始浮点值是从 didUpdateHeading 方法返回的 iPhone 的 trueHeading。当我使用 @"%.2f" 将原始浮点数转换为字符串时，它工作得很好，但我要做的是将原始浮点数转换为相同的值。如果我只是将字符串转换为 [string floatValue]，我会得到相同的原始浮点数，但我不想要那样。
To make it short and simple, how do I take an existing float value and just get the first 2 decimals?
为了简单起见，我如何获取现有的浮点值并只获取前 2 位小数？
回答by drawnonward
round( x * 100.0 ) / 100.0;
回答by ohho
float x = 123.45678;
int x1 = x * 100.0;
float x2 = (float) x1 / 100.0;
or if one-liner preferred
或者如果首选单线
float x3 = (float) ((int) (x * 100.0)) / 100.0;
