VC++ 已知弦高,弦长,求半径，夹角, 弧度

编写过程简单：附代码

void CMyDlg::OnButton1()
{
// TODO: Add your control notification handler code here
double H, L, r, A, C;

   CString str;
   ((CEdit *)(GetDlgItem(IDC_EDIT1)))->GetWindowText(str); //拱高
   H = atof(str);
   ((CEdit *)(GetDlgItem(IDC_EDIT2)))->GetWindowText(str); //弦长
   L = atof(str);

   if(H<=0 || L<=0)
   {
       AfxMessageBox("拱高,或弦长数值输入错误!!");
       return;
   }

   ((CStatic *)(GetDlgItem(IDC_STATIC1)))->SetWindowText("0.0"); //0.0
   ((CStatic *)(GetDlgItem(IDC_STATIC2)))->SetWindowText("0.0"); //0.0
   ((CStatic *)(GetDlgItem(IDC_STATIC3)))->SetWindowText("0.0"); //0.0
   ((CStatic *)(GetDlgItem(IDC_STATIC4)))->SetWindowText("0.0"); //0.0

   r = H/2 + L*L/(8*H);
   str.Format("%0.3f", r);
   ((CStatic *)(GetDlgItem(IDC_STATIC1)))->SetWindowText(str);
   str.Format("%0.3f", r*2);
   ((CStatic *)(GetDlgItem(IDC_STATIC2)))->SetWindowText(str);

   A =2*asin((L/2)/r);
   str.Format("%0.3f", A*180/3.1415);
   ((CStatic *)(GetDlgItem(IDC_STATIC4)))->SetWindowText(str);

C=A*r;
str.Format("%0.3f", C);
((CStatic *)(GetDlgItem(IDC_STATIC3)))->SetWindowText(str);
}

VC++ 已知弦高,弦长,求半径，夹角, 弧度

推导过程