在目标C中格式化浮点数 [英] Formatting floats in Objective C

问题描述

我需要将float（catchy title，he？）格式化为2个小数位，但前提是这些小数位的值不为零。示例：

I need to format a float (catchy title, he?) to 2 decimal places, but only if those decimal places have values that aren't zero. Example:

我有一个名为answer的NSTextField，在我对一些浮点数做一些数学后，我想将'answerFloat' 'NSTextField。到目前为止我有：

I have a NSTextField named 'answer', after I do some math with a couple of floats, I want to assign my 'answerFloat' variable to the 'answer' NSTextField. So far I've got:

[answer setStringValue:[NSString stringWithFormat:@"%.2f", answerFloat]];

但是它设置为45到45.00。我想要显示没有零的整数，以及要显示的任何十进制数以及它们各自的十进制值。

But that sets something like 45 to 45.00. I want whole numbers to be displayed without the zeroes, and any decimal numbers to be displayed with their respective decimal values.

我需要运行某种检查它到stringWithFormat？或者NSString是否提供了处理这个问题的方法？

Do I need to run some kind of check before giving it to stringWithFormat? Or does NSString offer a way to handle this?

推荐答案

您是否尝试过％g （[NSString stringWithFormat：@％g，％g，45.0，45.5]）; c $ c> c $ c>格式说明符

Have you tried the %g format specifier?

NSLog([NSString stringWithFormat:@"%g, %g", 45.0, 45.5]);

2010-01-12 19：54：38.651 foo [89884： 10b]
45，45.5

2010-01-12 19:54:38.651 foo[89884:10b] 45, 45.5

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