Rounding Doubles in C#

Question

I'm trying to do the Kaleidescope Code Coach, but I'm getting errors returned for some of the cases because the decimal values are in the thousandths place and not rounded to hundredths, as the program wants. How do I round the value to hundredths? (Additionally, how does one link Code Coach code? They don't show up under "My Code Bits")

Thank you

Answer 1

You can use Math.Round(number, numberOfDigits)

Answer 2

Lisa they used

MidpointRounding.AwayFromZero

Answer 3

Stephen Cloe ,

you can solve it by using this:

> remove both lines in code that contain the rounding.

> for the output we use string interpolation, which can be given also the decimal precision (this is doing the rounding) like:

...
Console.WriteLine(quot;{price:0.00}");
...

Answer 4

Stephen Cloe the easiest way is using the built in Math.Round() function .. or Math.Round(va, 3, MidpointRounding.toEven) for decimal rounding

https://code.sololearn.com/cpRmIHny5waY/?ref=app

Answer 5

Lisa in most cases double is preferred over float given decimal points as far as c# for precision... I also have a tendency to use float

Answer 6

Rahul D Coderz You can read the previous replies and find out what others have suggested and what turned out to be the actual problem.

Answer 7

Rahul D Coderz, do you have an actual point, or are you just here to flash your alleged credentials and argue with people?

The problem seems to be solved, so I suggest moving on.

Answer 8

Stephen Cloe
Try using the

price = Math.Round(price, 2, MidpointRounding.toEven);

Answer 9

BroFar
Did it work? I think using double causes a floating point issue.

Answer 10

Try it in my code Lisa switch 3 to 2 and MidpointRounding.toEven rounds the decimal point up or down.

Answer 11

BroFar Rounding away from zero worked. But it's not a fair task, if one has to guess the expected rounding procedure.
I just used float, and the default rounding procedure worked.

Answer 12

Lisa
I agree 👍 not exactly fair when there are other not clearly explained functions such as

MidpointRounding.AwayFromZero

MidpointRounding.ToEven

Answer 13

BroFar
Is it possible that they intended us to use a different data type or was it just chance that floats worked for me?

Answer 14

BroFar
In the Kaleidoscopes task, I mean, not in your code.
I tried to solve the task using double, but case 2 fails.

Answer 15

Stephen Cloe I hope this helped you with your task above.

Answer 16

BroFar AwayFromZero worked, thank you.

Answer 17

Thank you to both of you for your help!

Answer 18

Lothar Oh, thank you, I will keep this in mind. And as a code bit 😁

Answer 19

Rahul D Coderz You can read the previous replies.

Answer 20

Lisa It cuts off the thousandth digit, but it doesn't round it up
(i.e. my raw output is 14.445, running it through the Math.Round method changes it to 14.44, which is incorrect)

Here is my code:
static void Main(string[] args)
{
double quantity=Convert.ToDouble(Console.ReadLine());
double price=0;
if (quantity>1)
{
price=(quantity*5*0.9*1.07);
price=Math.Round(price, 2);
}
else
{
price=quantity*5*1.07;
price=Math.Round(price, 2);
}
Console.WriteLine(price);
}