How to find the percentage symbol

Question

0.00/5 (No votes)

See more:

Hi frds,
I am working in windows form. I want to do percentage calculation. So if Percentage symbol is percent means it will do percentage operation otherwise it will show message box. How can i do this.

What I have tried:

this is for percentage calculation. But this want to proceed only percentage symbol is persent
decimal PercentageRate = Convert.ToDecimal(this.textBox1.Text);
int Rate = Convert.ToInt32(textBox2.Text.Replace("%", ""));
int Total = Convert.ToInt32(this.textBox2.Text.Replace("%", "")) * Convert.ToInt32(PercentageRate) / 100 + Convert.ToInt32(this.textBox1.Text); this.textBox3.Text = Total.ToString();

Posted 7-Mar-16 22:41pm

Mekalamani

Updated 7-Mar-16 23:06pm

Add a Solution

Comments

CHill60 8-Mar-16 4:48am

Just to clarify what you are trying to do, what do you expect the users to type into each textbox ... please give an example

Michael_Davies 8-Mar-16 5:01am

Why are you storing PercentageRate as a decimal if you do not need the fraction and then you convert it to Int32 which will discard the fraction and possibly round up the result depending on what the user types in textBox1.

Presuming textBox1 is the percentage you want, textBox2 is the gross value to find the percentage of. In you Total= line you may need to put parenthesis around the 100+ as divide has precedence over add so it executes as value divided by 100 then add textBox1 value, where you probably want :

PercentageValue = Total - (Total / (1.0 + PercentageRate / 100))

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

OriginalGriff · Accepted Answer · 2016-03-07T23:06:00

It's pretty easy to check:

C#

string s = "25%";
if (s.Contains("%"))
   {
   // It's a percentage

Alternatively:

C#

string s = "25%";
...
s = s.Trim();
if (s.EndsWith("%"))
   {
   // It's a percentage

But...That codes a bit...poor.
Don't use Convert.To - use Int.TryParse or Double.TryParse instead.
They give you a bool result which tells you "this wasn't a valid integer", or "this wasn't a valid double" and allows you to tell the user there is a problem instead of continuing with possibly the wrong values and the user doesn't know it.