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EasySL

help float number

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example: m_fX = 0.2f; m_fY = 0.2f; m_fDir = 0.0f; m_esStatus = esIdle; m_fMoveStep = 0.05f; m_fX = (0.20000000) m_fmoveStep = (0.050000001) how to solve this problem?

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It is in the nature of floating-point numbers that they are not exact. There's no way around this; deal with the slight deviations, or use integer types if you need absolute accuracy.

Edit: ... Or fixed-point numbers, or large precision numbers such as the GNU MP library, but not floating-point.

[edited by - Miserable on May 29, 2004 3:47:29 AM]

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Depending on what you consider the problem:

1. Display less digits -- the formatting code will round appropriately.

2. Floating point numbers are almost always off by a tiny bit. They sacrifice precision in order to extend their range. That cannot be fixed -- that''s the way they work.


John Bolton
Page 44 Studios
Current project: NHL Faceoff 2005 PS2

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example:

float a = 0.05f;
float b = 0.1f;


void func()
{
b=b+a;
}

this func() be called by anything no-limit times;

the ''b'' is error.

hmm~~!!!!

it''s is not exact also accept.
but every called ADD 0.0000000001f,
i can''t accept autoadd a ''0.000000000001f''

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