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What is the correct way of writing: else if (9<result<16) in C#? [closed]

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the syntax:
(9<result<16)
is appearing to be invalid when I'm using it in my C# code. I want the else if statement to consider the condition: when the sum of two integers is greater than 9 and less than 16, and return the line :"That's a poor grade" as a result. But the problem is that writing the condition as (9
Screen shot of code to give you context
Edit: ignore the following as I'm writing all this to make the edit more substantive, so that my post can be corrected

You can convert to
else if (9 < result && result < 16)
Also, you need return int value in Add method as
public static int Add (int num01, int num02){
//Console if need
return num01 + num02;
}

How to append a string in C# dynamically? [closed]

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Thank you in Advance:
I have a parameter which gives the row_count after loading the data.
i need to insert that value into a file, which i am able to do it.
But I need the format in this manner:
if the row_count is 150 then
I am getting only Param name='INPUT_NUM_RECS value=150/
But I need the output as
Param name='INPUT_NUM_RECS value=000000150/
Thank you.

Assuming that 150 is an int variable name num.
int num = 15;
string output = $"Param name='INPUT_NUM_RECS value={num:D9}"
Here using D9 we will place the int value with leading zeroes if the number of digits in num is less than 9.
Number of leading zeroes = 9 - digits in num
If number of digits in num is more than 9, num will not be truncated

calculate multiple values type to string [closed]

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i have two textboxes 1 called 'mtb_NETPAIE02' and 2 called 'mtb_TAXE02'
the format in the two textboxes is currency/money (double) i want to fix the error on this Code :
if (double.Parse(mtb_NETPAIE02.Text) >= 100001 )
{
mtb_TAXE02.Text = (double.Parse(mtb_NETPAIE02.Text) / 5000 * double.Parse("12")
+ double.Parse("18").ToString("N2")).ToString();
}
12 (12,00) and 18 (18,00) are money but 5000 is int .
how to make this right ?

First of all, you should not be using double if you're working with money; you should be using decimal.
Secondly, you should use the literals for decimal, i.e. with the M suffix.
Finally, you are attempting to add the result of decimal.Parse("18") to the other numeric values, but you are converting it to a string first via ToString("N2"). You should move the latter outside your parens to convert the whole result from the calculation into a string:
if (decimal.Parse(mtb_NETPAIE02.Text) >= 100001M )
{
// notice the `M` in 5000M
mtb_TAXE02.Text = (decimal.Parse(mtb_NETPAIE02.Text) /
5000M * decimal.Parse("12") + decimal.Parse("18")).ToString("N2");
}

Having trouble creating a regular expression [closed]

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I want to check for a match in a string such that the string ends in a dash and then two digits. Therefore "bill-01" will be a match, as will "jared-43" but "josh" and "allen47-" won't. I just need a bool true/false to tell if a match was found for the given string.
Thank you.

this will match anything as long as it ends with - followed by two numbers
.*-[0-9]{2}
http://txt2re.com/
http://www.regexr.com/
http://en.wikipedia.org/wiki/Regular_expression#POSIX_basic_and_extended
Have fun

string pattern = #".*-\d{2}";
Match match = Regex.Match(arg, pattern);
Console.Write("{0} ", arg);
if (match.Success)
{
Console.WriteLine("Matched");
}
else
{
Console.WriteLine("did NOT Match");
}

Math.Round doesn't behave like i want it to. (X.0xxxxx numbers) [closed]

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Quick question.
I'm making a diagram so the numbers i'm passing to the function can be anything (depending on zoom and such). Lets say I want to round the number 3.086948353 to 3 but i still want other numbers like 2.199999999 to round to 2.2.
Currently it just looks like this:
Math.Round(value, 10)

You want to do two things in single shot:
Get the integer value if first digit after decimal is 0
Get the rounded value upto last 2 digits if its first digit after decimal is not 0.
For second option you can use:
newValue = Math.Round(value, 2)
Now comes the first requirement:
Once you get the decimal with 2 digits after decimal, get last two digits:
int decimalValue= (int)((newValue - (int)newValue ) * 100);
if(decimalValue < 10)
{
newValue = Math.Floor(value);
}