#include<iostream>
using std::cout; 
float Q_rsqrt( float number ) { long i; float x2, y; 
const float threehalfs = 1.5F;
 
x2 = number * 0.5F;
y  = number;
i  = * ( long * ) &y;                       // evil floating point bit level hacking
i  = 0x5f3759df - ( i >> 1 );               // what the fuck? 
y  = * ( float * ) &i;
y  = y * ( threehalfs - ( x2 * y * y ) );   // 1st iteration
// y = y * ( threehalfs - ( x2 * y * y ) ); // 2nd iteration, this can  be removed
 return y;
} 
int main(void) { cout<<Q_rsqrt(23.22); }

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