Adding Integers and Decimals

Well, I'd expect a line like this to give the right answer:

double d = 2.5 + 2; // 4.5

because the integer, 2, will be automatically converted to a double and then added to the other double, to give a double result.

The same applies to subtraction and multiplication.

However, you can sometimes get unexpected results when you divide integers by integers. For example:

double d = 3/2; // 1 rather than 1.5

To ensure you don't get any nasty surprises, always suffix integers with 'd' so they're treated as doubles:

double d = 3d/2d; // 1.5

If you're using the decimal type rather than double, then suffix both decimals and integers with 'm'.