How to round up value C# to the nearest integer?

Question

I want to round up double to int.

Eg,

double a=0.4, b=0.5; 

I want to change them both to integer.

so that

int aa=0, bb=1; 

aa is from a and bb is from b.

Any formula to do that?

Answer 1

Use Math.Ceiling to round up

Math.Ceiling(0.5); // 1 

Use Math.Round to just round

Math.Round(0.5, MidpointRounding.AwayFromZero); // 1 

And Math.Floor to round down

Math.Floor(0.5); // 0 

Answer 2

Check out Math.Round. You can then cast the result to an int.