any significant difference

iLikeWaffles

Feel a bit silly asking in a new thread but just wondering if there is any significance in declaring a float like this:

float whatever = 0.f;
or
float whatever = 0.0f;

besides the dropped zero after the decimal is there any advantage to doing the first?

28064212

Stating the language would help. In C#, the former is a syntax error. Assuming it's Java, you could just do this to test:

float x = 0.F;
float y = 0.0F;
System.out.print(x == y);

iLikeWaffles

28064212 wrote: »

Stating the language would help. In C#, the former is a syntax error. Assuming it's Java, you could just do this to test:

float x = 0.F;
float y = 0.0F;
System.out.print(x == y);

It's C++

Anima

There isn't a difference no.

iLikeWaffles

I'm just thinking out loud here and a little busy porting code to set up a project.
Just to followup. Lets say I have:

#define pi   3.14159265358979323

float 2pi = 0.00f;

2pi = 2*pi;

Would that make

2pi == 6.28

or

2pi == 6.28318530717958646

Colonel Panic

You can just test these things for yourself!!

Why would it round the float to two decimal places???

iLikeWaffles

Colonel Panic wrote: »

You can just test these things for yourself!!

Why would it round the float to two decimal places???

As I said I'm a little busy and thinking out loud. Why have a forum if that's the case???

smacl

iLikeWaffles wrote: »

I'm just thinking out loud here and a little busy porting code to set up a project.
Just to followup. Lets say I have:

#define pi   3.14159265358979323

float 2pi = 0.00f;

2pi = 2*pi;

Would that make

2pi == 6.28

or

2pi == 6.28318530717958646

Neither.

Edit:

1) 2pi is not a legal variable name in C++
2) If you were to use a legal variable name, e.g. TwoPi the value would be 6.28318548 which is limited by that fact that a float is only 4 bytes
3) You should avoid == equality checks on doubles and floats in C++ for values other than zero, see https://stackoverflow.com/questions/18971533/c-comparison-of-two-double-values-not-working-properly Use an epsilon value or similar.