ASP.NET & C# abs and min function

Question

I am using Visual Studio 2015 with ASP.NET & C#. I have this calculation I am trying to implement into C# coding, but it says abs and min math functions are not there.

This is the code:

private double angle(int h, int m)
{
    h = Convert.ToInt32(ddlHours.SelectedItem.Value);
    m = Convert.ToInt32(ddlMinutes.SelectedItem.Value);

    double hAngle = 0.5D * (h * 60 + m);
    double mAngle = 6 * m;
    double angle = Math.abs(hAngle - mAngle);
    angle = Math.min(angle, 360 - angle);
    return angle;
}

Ultimately, I want the answer to go to my label.

How do I get the abs and min function, or is there another way that still provides the accuracy of this calculation?

write Math.Abs and Math.Min – Faraz Ahmed Mar 08 '16 at 07:10 — Faraz Ahmed, Mar 08 '16 at 07:10

score 2 · Answer 1 · answered Mar 08 '16 at 07:06

2

c# is case sensitive

double angle = Math.Abs(hAngle - mAngle);
angle = Math.Min(angle, 360 - angle);

answered Mar 08 '16 at 07:06

PatrickSchiefer

139
10

score 1 · Answer 2 · answered Mar 08 '16 at 07:06

Use Intellisense. Its a capital A on Abs: https://msdn.microsoft.com/en-us/library/a4ke8e73(v=vs.110).aspx

MSDN is your friend if Intellisense isn't working for you. Put your cursor on the words abs and press CTRL+SPACE and it will correct it for you

score 0 · Accepted Answer · edited May 23 '17 at 12:06

I would suggest a few things;

C# is a case sensitive language. The right syntax of those methods are Math.Abs and Math.Min
Depending on your structure of course but this method would be better as a static method since probably it will not need an instance to calculate this angel value.
You don't assign your ddlHours.SelectedItem.Value and ddlMinutes.SelectedItem.Value to your parameters inside of your method. In such a case, there will be difference between angle(5, 30) and angle(6, 40) method calls since both do the calculation based on those dropdownlist values.

Parse your dropdownlist values to integer and call your angel method with those parameters.

static double angle(int h, int m)
{
    double hAngle = 0.5D * (h * 60 + m);
    double mAngle = 6 * m;
    double angle = Math.Abs(hAngle - mAngle);
    return Math.Min(angle, 360 - angle);
}

and call this method as;

int h = Convert.ToInt32(ddlHours.SelectedItem.Value);
int m = Convert.ToInt32(ddlMinutes.SelectedItem.Value);

double angel = YourType.angel(h, m);

ASP.NET & C# abs and min function

3 Answers3