f和F有什么区别

Question

In the following code, the const are defined using two different ways.

     const float KS = 0.001F;
     const float WW = 0.001f;

Is there any difference between F and f?

Revision 1: If both are same then why both cases are allowed ?

Answer 1

Nope, no difference between f and F in this case. It's the special suffix for float literals, either works fine.

With the long literals, there's stylistic difference: l (lowercase) looks a lot like 1 (the number one). It's recommended to use capital L for long literals.

References

• MSDN/C# Programmer's Reference/float

  By default, a real numeric literal on the right-hand side of the assignment operator is treated as double . Therefore, to initialize a float variable use the suffix f or F .

• MSDN/C# Programmer's Reference/long

  You can also use the lowercase letter "l" as a suffix. However, this generates a compiler warning because the letter "l" is easily confused with the digit "1" . Use "L" for clarity.

Answer 2

Yes, the case :) Functionality wise, no. Its the same as String and string .