如何在C中将负零转换为正零?

问题描述

您好，我正在学习Objective C，并且正在做经典的Calculator示例.

Hello I'm learning Objective C and I was doing the classic Calculator example.

问题是当我将零乘以任何负数时，我得到一个负零，然后将结果放入(双精度)类型！

Problem is that I'm getting a negative zero when I multiply zero by any negative number, and I put the result into a (double) type!

要查看发生了什么，我玩了调试器，这就是我得到的:

To see what was going on, I played with the debugger and this is what I got:

(gdb)打印(两倍)-2 * 0
$ 2 = -0

(gdb) print (double) -2 * 0
$2 = -0

在第二种情况下，当我将其强制转换为双精度类型时，它变为负零！如何在应用程序中解决该问题?我需要打双打.如何修复结果，以便当结果应为零时得到零?

In the second case when I cast it to a double type, it turns into negative zero! How can I fix that in my application? I need to work with doubles.How can I fix the result so I get a zero when the result should be zero?

推荐答案

我做了一个简单的测试:

I did a simple test:

double d = (double) -2.0 * 0;

if (d < 0)
    printf("d is less than zero\n");
if (d == 0)
    printf("d is equal to zero\n");
if (d > 0)
    printf("d is greater than zero\n");

printf("d is: %lf\n", d);

它输出:

因此，要解决此问题，您可以在应用程序中添加简单的if-check:

So, to fix this, you can add a simple if-check to your application:

if (d == 0) d = 0;

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