Example code of the C ++ quick Square Root Algorithm

SquareRootFloat function compute's quick sqrt algorithm, derived from Carmack's QUAKE3, is much faster than library functions

# Include <iostream>
Using namespace std;
Float SquareRootFloat (float number)
{
Long I;
Float x, y;
Const float f = 1.5F;
X = number * 0.5F;
Y = number;
I = * (long *) & y;
I = 0x5f3759df-(I> 1); // magic number
Y = * (float *) & I;
Y = y * (f-(x * y); // iteration 1 1/sqrt (number)
Y = y * (f-(x * y); // iteration 2 1/sqrt (number)
// Y = y * (f-(x * y); // iteration 3 1/sqrt (number). Please iterate multiple times if you need higher accuracy.
Return number * y;
}

Main ()
{
Float B = 9852.0;
// Cout <SquareRootFloat (B) <endl;
Float c = SquareRootFloat (B );
Float e = c * c;
Cout <e <endl;
System ("pause ");
}