what the code below explains

float funi Moat number) long float x2 const floor threehalfs=1.SE x2 = number 0.58 y number: 1-long) &y://evil floating point bit level hacking 10x533759df. (1 >> 1); // what the f? y=(float) & ; y=y / threehalfs - (x2*y*y);// 1st Iteration My=y (threehalfs- / x2*y*y)://2nd iteration, this can be removed retumy }