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What does the f mean?


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#1 Viscous-Flow   Members   -  Reputation: 122

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Posted 26 August 2001 - 04:18 PM

This has got to be a newbie question that I never took the time to figure out. But what is that ''f'' that I see on the end of floats and numbers in several OpenGL graphics functions/tutorials/books. Is it just a shortcut to make it a float or something; I can''t find any information about it in my OpenGL book or any C/C++ programming book for that matter. I notice the functions perform the same thing without the ''f''s but why are they there? Is it necessary to have them? Here is an example: glVertex3f(0.0f, -10.0f, 0.0f); // What is the f? or glLightf(GL_LIGHT0, GL_SPOT_CUTOFF, 40.0f); // What is the f? etc. Any help would be GREATLY appreciated!

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#2 Null and Void   Moderators   -  Reputation: 1087

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Posted 26 August 2001 - 04:24 PM

The ''f'' means it''s a float, not a double. If you take away the ''f'', it is a double, and ends up getting converted to a float.

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#3 Sly   Members   -  Reputation: 128

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Posted 26 August 2001 - 04:25 PM

The ''f'' tells the compiler that the floating point number is a single-precision number (four bytes) as opposed to the default of a double-precision number (eight bytes).

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