Ravon
Level: Master Delver

Rank Points: 220
Registered: 02-19-2004
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I'm programming a game (if you could call it that) and need to convert a floating point number into an integer, if someone could give me an easy way to do that that would be great!!

Also, to post something on the development board, does it have to be DROD related?

stigant
Level: Smitemaster

Rank Points: 1182
Registered: 08-19-2004
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Well, it depends on if you want to round or truncate.

if you want to truncate, you can just do this:

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

if you want to round, there are some rounding functions, but they essentially do this:

float f = whatever;
int i = (int)(f + 0.5);


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AlefBet
Level: Smitemaster
Rank Points: 979
Registered: 07-16-2003
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As a matter of style, I prefer to use static_cast. I.e.:

float f=g();
int i=static_cast<int>(f); // or int i=static_cast<int>(f+0.5);

It's more verbose, though, but C style casts are a bit too powerful (in a bad way) and I try to avoid using them. A C style cast is harmless in this case, but I try to make it a rule....

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Ravon
Level: Master Delver

Rank Points: 220
Registered: 02-19-2004
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Thank you both!

SKWERLL
Level: Delver

Rank Points: 77
Registered: 02-22-2004
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Is this that Simple City game you were talking about at school? If it is, could you post a link in this thread once you get it uploaded? (I'm not so good at remembering links, and http://freewebs.com/randomflyingpigs/simplecity.ral doesn't seem to work.)

From what he tells me, the game he's programming is a text-based game that's kinda like a SimCity/Strategy game. Of course, I may be quite wrong.

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wmarkham
Level: Master Delver

Rank Points: 125
Registered: 12-06-2004
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AlefBet wrote:
As a matter of style, I prefer to use static_cast. I.e.:

float f=g();
int i=static_cast<int>(f); // or int i=static_cast<int>(f+0.5);

It's more verbose, though, but C style casts are a bit too powerful (in a bad way) and I try to avoid using them. A C style cast is harmless in this case, but I try to make it a rule....

In the spirit of one-upmanship, or maybe even two-upmanship:

float f=g();
int i(f);
assert(0<f ? (i-1<f && f<=i) : (i<=f && f<i+1));

I don't actually recall if C++ actually requires rounding toward zero. It may be the case that for some compilers, both positive and negative numbers are rounded downward. Regardless, note that the assert statement protects against out-of-range floating point values.