使浮点数只显示两位小数 [英] Make a float only show two decimal places

问题描述

我在 float 中有值 25.00，但是当我在屏幕上打印它时它是 25.0000000.
如何显示只有两位小数的值?

I have the value 25.00 in a float, but when I print it on screen it is 25.0000000.
How can I display the value with only two decimal places?

推荐答案

这不是数字如何存储的问题，而是您如何显示它的问题.将其转换为字符串时，您必须四舍五入到所需的精度，在您的情况下是两位小数.

It is not a matter of how the number is stored, it is a matter of how you are displaying it. When converting it to a string you must round to the desired precision, which in your case is two decimal places.

例如:

NSString* formattedNumber = [NSString stringWithFormat:@"%.02f", myFloat];

%.02f 告诉格式化程序您将格式化一个浮点数 (%f)，并且应该四舍五入到两个位置，并且应该用 <填充code>0s.

%.02f tells the formatter that you will be formatting a float (%f) and, that should be rounded to two places, and should be padded with 0s.

例如:

%f = 25.000000
%.f = 25
%.02f = 25.00

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