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getting absolute value

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I'm trying to adjust my camera and I have the z axis centroid which is sometimes a negative number and other times not. Since this function will be in my display() function, it gets called alot and I'm trying to figure out what the most efficient way is to get the absolute value of my smallest Z axis value (which can be pos or neg) so that I can multiply it by 2 and place my camera in that Z axis position away from my model (which should always be positive IIUC). I hope I'm on the right track as to how placing the camera should be done.

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The big mystery of finding the absolute value of x =)

1. // float/double
x = fabs(x);
x = abs(x);

x = x < 0 ? -x: x;

if ( x < 0 ) x = -x;

4. // float/double
x = sqrtf(x*x);
x = sqrt(x*x);

5. // float
fld x
fstp x

6. // float
*(((int *) &x)) &= 0x7fffffff;

7. // double
*(((int *) &x) + 1) &= 0x7fffffff;

8. // int
x = (x ^ (x >> (sizeof(int) * 8 - 1))) - (x >> (sizeof(int) * 8 - 1));

did I miss one? =p

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