Obj-C 计算器 - 弧度换算为度数

发布于 2024-11-17 13:42:04 字数 1092 浏览 4 评论 0原文

我一直在观看斯坦福大学 CS193P 讲座，并且一直在研究作业计算器。我相当轻松地完成了第一个作业，现在我正在努力为该作业获得额外的学分。然而，我陷入了一个额外的学分问题：

实现一个用户界面来选择 sin() 或 cos() 的操作数是考虑弧度或度数。当您在 C 库中调用 sin(x) 时，假定 x 以弧度为单位（即 0 到 2π 绕一圈），但用户可能想要输入 180 并按 sin 按钮，得到 0 而不是 -0.8012 （这是 180 弧度）。您可以为此使用 UIButton 并切换 titleLabel 每次按下 UIButton 时都会显示文本，但更好的方法是看看是否可以通过阅读文档了解如何使用 UISwitch（如果你敢的话！）。

我实现了一个 UISwitch 并将其连接为 IBOutlet。当我执行“操作”时，我会检查开关是打开还是关闭，并将其与要执行的操作一起传递给我的模型。在我的 sin 和 cos 情况下，我执行以下操作：

else if ([operation isEqual:@"sin"])
{
    if (radians) {
        operand = sin(operand);
    }
    else {
        operand = sin(operand) * (180 / M_PI);
    }

}
// similar for cos

如果 radians （这是一个 BOOL：YES = 弧度，no = 度），那么我照常执行操作；如果用户将开关切换到“度”，我想返回以度为单位的值，如分配所述：用户可能想要输入 180 并按 sin 按钮并得到 0 而不是 -0.8012 （这是180 弧度的正弦）。

但是，此代码不能完全工作。当我将开关切换到度数并执行 sin 180 时，它返回的值或多或少为 -45。那里出了点问题；我不太确定是什么。我已经查过如何进行转换，我认为我做得对，但显然不是。

我意识到这可能更适合 math.stackexchange，但由于我想发布一些代码，所以我将其放在这里。有人可以就实现这一点的最佳方法提供一些建议吗？我已经有一段时间没有使用 cos 或 sin、弧度和度数了。

谢谢！

原文

I've been watching the Stanford CS193P lectures and I've been working on the assignment calculator. I got through the first assignment fairly easily, and I'm trying to do the extra credit for the assignment now. I'm stuck however at one of the extra credit questions:

Implement a user-interface for choosing whether the operand to sin() or cos() is
considered radians or degrees. When you call sin(x) in the C library, x is assumed
to be in radians (i.e. 0 to 2π goes around the circle once), but users might want to
enter 180 and press the sin button and get 0 instead of -0.8012 (which is the sine of
180 radians). You could use a UIButton for this and switch out the titleLabel’s
text each time the UIButton is pressed, but a better way would be to see if you can
figure out how to use a UISwitch by reading the documentation (if you dare!).

I implemented a UISwitch and hooked it up as an IBOutlet. When I perform an 'operation', I check if the switch is on or off and pass this to my model along with the operation to perform. In my sin and cos cases, I do the following:

else if ([operation isEqual:@"sin"])
{
    if (radians) {
        operand = sin(operand);
    }
    else {
        operand = sin(operand) * (180 / M_PI);
    }

}
// similar for cos

If radians (which is a BOOL: YES = radians, no = degrees), then I perform the operation as usually; if the user puts the switch to 'degrees', I want to return the value in degrees, as the assignment states: users might want to enter 180 and press the sin button and get 0 instead of -0.8012 (which is the sine of 180 radians).

However, this code doesn't fully work. When I put the switch to degrees and do sin 180 it returns a value of more or less -45. Something is wrong there; and I'm not really sure what. I have looked up how to do the conversion and I think I'm doing it right, but apparently not.

I realise this is perhaps better suited for math.stackexchange, but since there was some code I wanted to post I put it here. Can someone provide some advice on the best way to implement this? It's been a while since I even worked with cos or sin, radians and degrees.

Thanks!

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无言温柔 2024-11-24 13:42:04

您的意思可能是 operand = sin(operand * M_PI / 180); 吗？

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无人问我粥可暖 2024-11-24 13:42:04

试试这个 - 它对我有用：

    if ([operation isEqual:@"sin"])
    {
        operand = (operand * M_PI/180); // first convert the operand from radians to degrees then perform the operation
        operand = sin(operand);
    }

希望这有帮助

Try this - It works for me:

    if ([operation isEqual:@"sin"])
    {
        operand = (operand * M_PI/180); // first convert the operand from radians to degrees then perform the operation
        operand = sin(operand);
    }

Hope this helps

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