void CalcButt_Click(object sender, EventArgs e)
{
EditText nIn = FindViewById <EditText>(Resource.Id.editN);
EditText pIn = FindViewById <EditText>(Resource.Id.editP);
EditText rIn = FindViewById <EditText>(Resource.Id.editR);
EditText aIn = FindViewById <EditText>(Resource.Id.editA);
string nTxt = nIn.Text;
string pTxt = pIn.Text;
string rTxt = rIn.Text;
string aTxt = aIn.Text;
int n = 0;
double p = 0;
int r = 0;
double a = 0;
bool nInS;
bool pInS;
bool rInS;
bool aInS;
nInS = Int32.TryParse(nTxt, out n);
pInS = double.TryParse(pTxt, out p);
rInS = Int32.TryParse(rTxt, out r);
aInS = double.TryParse(aTxt, out a);
Toast nBad = Toast.MakeText(this, "n = " + nTxt + " is not valid", ToastLength.Short);
Toast pBad = Toast.MakeText(this, "p = " + pTxt + " is not valid", ToastLength.Short);
Toast rBad = Toast.MakeText(this, "r = " + rTxt + " is not valid", ToastLength.Short);
Toast aBad = Toast.MakeText(this, "a = " + aTxt + " is not valid", ToastLength.Short);
bool inError = false; // __________ Displaying Error Messages: __________
if (!nInS) // Error messages are only displayed if no previous errors were shown, so errors can be dealt with individually.
{
if (!inError)
{
nBad.Show(); // Show error message
inError = true;
}
}
if (!pInS || p > 1)
{
if (!inError)
{
pBad.Show(); // Show error message
inError = true;
}
}
if (!rInS || r > n)
{
if (!inError)
{
rBad.Show(); // Show error message
inError = true;
}
}
if (!aInS)
{
if (!inError)
{
aBad.Show(); // Show error message
inError = true;
}
} // __________ End of Error Messages __________
if (!inError) // Calculations only carried out if no parsing/maths errors were found.
{
TextView p_XetX = FindViewById <TextView>(Resource.Id.p_XetX); // First textview
TextView p_XltORetX = FindViewById <TextView>(Resource.Id.p_XltORetX); // Second textview
// Get values from Maths class and convert to string
string p_XetX_string = "P(X = x)= " + ((Maths.BinomialProb_XetR(n, p, r)).ToString("0.0000"));
string p_XltORetX_string = "P(X ≤ x)= " + (Maths.BinomialProb_XltORetR(n, p, r)).ToString("0.0000");
// Assign string values to label text
p_XetX.Text = p_XetX_string;
p_XltORetX.Text = p_XltORetX_string;
// Labels centred
}
}