How to show float numbers?

[ding]

Hi, my teacher,

I can show texts of char type using
glListBase(1000);
glCallLists(Twidth,GL_UNSIGNED_BYTE,Text[i]);
But how to show float number in OpenGL?

thanks!

[V-man]

You use the same technic, but you convert the float number to a string. Use your favorite library or your own code to do that.

NAOQ - not a advanced opengl question

V-man

[ding]

[QUOTE]Originally posted by V-man:
[B]You use the same technic, but you convert the float number to a string. Use your favorite library or your own code to do that.

I have convert it to a string. But how to show decimal's position. I want to know whether to show float number directly,which needn't convert or use own code.

[gumby]

sprintf

[Robbo]

NEVER use sprintf with floating point numbers. Always a risk of a crash. Use snprintf instead to guard your buffer sizes.

!!!!! (speaking from experience of course).

[Michael Steinberg]

As you can use %5.5 you can avoid the crash.

[Devulon]

Originally posted by Michael Steinberg:
As you can use %5.5 you can avoid the crash.

I agree with mike, you simply have to make sure your buffer can accomidate the number of digits you are going to generate. In reality this isn't a big deal. Just make your buffer a resonable size and its an issue that should never come up. I really don't think that this borders on the line of a buffer overrun type of hack.

(:

Devulon

[knackered]

5.5 won't limit you to 5 output characters.
It simply means miniumum of 5 characters, with a precision of 5 decimal places.

[Bob]

#include <sstream>
using namespace std;
...
{
    ostringstream s;
    s << myFloat;
    // the number as a string is now available in s.str()
}

... to avoid buffer overruns.

[nickels]

Paranoia! Will destroy ya!

(By the way, printf and sprintf are so incredible to use compared to C++ formatting statements. You want to talk about one major step backwards in the name of progress, this is it)