在Visual Basic中制作科学计算器

Question

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I want to make program in visual basic that can calculate cosine of any angle in degrees such that when I enter the angle in the textbox labeled "angle text box" and hit the "cos" button it well show the result in "result text box". This code give the cosine in radians. I need it in degrees

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
    TextBox2.Text = Math.Cos(TextBox1.Text)
End Sub

Answer 1

The .Net framework's Math namespace trigonometric functions expect to have angles expressed as radians, not degrees.

Before calling Math.Cos() , convert your input from degrees to radians, like this:

Textbox2.Text = Math.Cos(Textbox1.Text * (Math.PI / 180.0));