Where is round() function?

[Zink]

I tried to use round() function in my PPC application, but I'm getting "POLINK: error: Unresolved external symbol 'round'.". The same for roundf() and rintf(). Using PellesC 5.00.8.

I thought they were standard functions, so they shouldn't require any andditional libraries. I have listed all WinCE libraries anyway, and found no round() function, so I guess they aren't available on WinCE. But why would so basic function be not available? I guess I could write myself a round() equivalent, but I would rather like to use a standard one if it was available.

[Bitbeisser]

In my Win32 setup, v 6.00.4 (32 bit), it is in various forms in math.h, where I would expect it... 

Ralf

[AlexN]

In my Win32 setup, v 6.00.4 (32 bit), it is in various forms in math.h, where I would expect it...  

Ralf

I made a text search in the WinCE libraries and I did not find any round-function. So I assume that Pelle has no round-function for WinCE.
EDIT: But if it helps you, you can use casting of a float variable to int:

Code Select Expand

float f = 5.5;
int i = (int) f;


[JohnF]

A rough and ready round function can be implemented like so;

Code Select Expand


int myround(double number)
{
return (number >= 0) ? (int)(number + 0.5) : (int)(number - 0.5);
}


John

[Zink]

I have found in PellesC help the page about intrinsic functions, and there is an information that rint() (which is just round() returning integer) is not available for ARM, so I guess it's the same for round() too.

I have written this function for rounding:

Code Select Expand

int froundi(float val)
{
  if (val - floor(val) < 0.5)
    return floor(val);
  else
    return ceil(val);
}

but JohnF's version seems better.

Thanks.

[Bitbeisser]

In my Win32 setup, v 6.00.4 (32 bit), it is in various forms in math.h, where I would expect it...  

Ralf

I made a text search in the WinCE libraries and I did not find any round-function. So I assume that Pelle has no round-function for WinCE.

:oops: Sorry, my bad, I missed that he was not using a Win(32) setup/target... :-(

Ralf

[AlexN]

A rough and ready round function can be implemented like so;

Code Select Expand


int myround(double number)
{
return (number >= 0) ? (int)(number + 0.5) : (int)(number - 0.5);
}


John

Good but I would prefer this:

Code Select Expand


#define round(x) ((x >= 0) ? (int)(x + 0.5) : (int)(x - 0.5))


It works for float, double and long double and you don't have the framework of a function call.

[JohnF]

Zink,

I think that because of memory constrains with the PPC various standard functions are missing that are normally included.

John