What is the correct way of representing double in c#?

Question

I am using the first way and my new company is using the second way.

double x = 1.99; 

double y = 9.02D; 

which one is correct and why? and If both is correct, then how to use this is in different scenarios ?

Answer 1

From msdn:

By default, a real numeric literal on the right-hand side of the assignment operator is treated as double. However, if you want an integer number to be treated as double, use the suffix d or D, for example: Copy

double x = 3D;

So there is no difference between double x = 1.99; and double y = 9.02D;

Answer 2

I would say the way your company is doing it is probably safer. The D after the value 9.02 forces the integer numeric (real) value 9.02 to be treated as a double.

Answer 3

A floating-point literal without a suffix is a double, so there's really no difference between 1.99 and 1.99D (or 1.99d) - except that the latter form makes it explicit that this is, indeed, a double. So it's a matter of style, really. In general, you should of course stick to your company's style (unless you have a really compelling reason that the style is "wrong" - in which case you should convince the company to change the style, rather than just silently violating it yourself ;-) ).