percents and floating decimal points

[Mokujin]

Ok here is my problem..here is a section of code in a program im trying to create -note this is my first program-

int firstlabel = 0;
double firsttextbox = 0;
double result = 0;
firstlabel = int.Parse(label1.Text);
firsttextbox = double.Parse(textBox1.Text);
result = firstlabel * firsttextbox;
label6.Text = result.ToString();


Now by looking at the code if
firstlabel = 400
and
firsttextbox = 50
the result would be 20,000
But what i am trying to do is make firsttextbox be a percent ie. i want the result to be 200 without the user haveing to input .50 in firsttextbox.
to clear it up a little if the user selected something and it displayed 400 in firstlabel then they inputed 50 in the first textbox i want it to do 400 * 50% and so far the only way i can get this done is by typing .50 in the firsttextbox.
Thanx for any help

 

[JurkMonkey]

Why don't you divide the answer by 100 if percentage >= 1?

 

[Mokujin]

Let me rephrase..
how would i
%
result = firstlabel - firsttextbox;

but i want firsttextbox to be a percent
so it would be firstlabel - a percent.

 

[JurkMonkey]

So if you have 100 in the label and the person types in 25 you want the answer to be 75?

result = label(100) - textbox(25%)
result = label(100) - (100 * .25)
result = 100 - 25
result = 75

if that's the case then your code would look something like:

double amt = Convert.ToDouble(firstlabel.Text);
doublc percent = Convert.ToDouble(firsttext.Text);

if ((percent < 1) && (percent > 0))
{
percent = percent / 100.00;
}

amt -= (amt * percent);