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

0 vote208 views1 answer
Increment & Decrement Operator in C language
C
0 vote220 views1 answer
Right side of div
C
0 vote197 views1 answer
Bash get load average
C
-2 votes206 views2 answers
Download file by command line windows
C
0 vote199 views1 answer
Form controls in bootsrap
C
7 votes195 views1 answer
Invalid operands to binary expression ('int *' and 'int *')
C
1 vote219 views1 answer
ModuleNotFoundError: No module named 'tensorboardX'
C
0 vote200 views1 answer
How to get input in 2d array in c
C
2 votes215 views8 answers
NgIf
C
0 vote195 views1 answer
C program for assignment operator
C