Fast inverse square root explained

    float InvSqrt(float x){
        float xhalf = 0.5f * x;
        int i = *(int*)&x;            // store floating-point bits in integer
        i = 0x5f3759df - (i >> 1);    // initial guess for Newton's method
        x = *(float*)&i;              // convert new bits into float
        x = x*(1.5f - xhalf*x*x);     // One round of Newton's method
        return x;
    }

Source: betterexplained.com

Similar codes

54 votes505 views3 answers
Express post
C
0 vote359 views1 answer
C convert string to size_t
C
0 vote360 views3 answers
Confirm sweet alert
C
2 votes394 views2 answers
'django.contrib.auth.views' has no attribute 'logout'
C
0 vote373 views1 answer
C add char to char array
C
6 votes367 views2 answers
How to remove button decoration
C
1 vote362 views2 answers
Data types arduino
C
0 vote367 views1 answer
Form controls in bootsrap
C
0 vote380 views1 answer
E sharm card jobkhozo.com
C
0 vote392 views2 answers
Convert calendar time to epoch in c programming
C