public double integration(string expr, double n, double n1)
{
double res = 0;
int i = (int)((n1 - n) / 0.1), k = 0;
exprsolution exprsolution_obj = new exprsolution();
for (double j = n; k <= i; j += 0.1)
{
if (k == 0 || k == i)
{
res += double.Parse(exprsolution_obj.exprsol(expr.Replace("X", j.ToString())));
}
else
{
res += 2 * double.Parse(exprsolution_obj.exprsol(expr.Replace("X", j.ToString())));
}
k++;
}
res = res * 0.1 / 2;
return(res);
}
private void Calculate_click(object sender, RoutedEventArgs e)
{
int j = 1;
exprsolution exprsolution_obj = new exprsolution();
try
{
if (X1.Text != "X1" && X2.Text != "X2" && h.Text != "h")
{
for (double i = double.Parse(X1.Text); i <= double.Parse(X2.Text); i += double.Parse(h.Text))
{
if (ƒx.Text.Contains('x'))
{
output_table.Text += "\n" + j.ToString() + " " + i.ToString() + " " + exprsolution_obj.exprsol(ƒx.Text.Replace("x", i.ToString()));
}
else
{
output_table.Text += "\n" + j.ToString() + " " + i.ToString() + " " + exprsolution_obj.exprsol(ƒx.Text.Replace("X", i.ToString()));
}
j++;
}
}
}catch (Exception g) {
g.ToString();
output_table.Text += "\nSyntax Error";
}
}