IEEE Standard 754 Floating Point Numbers
http://steve.hollasch.net/cgindex/coding/ieeefloat.html
根據標準,一些浮點數的二進制表示
0 0x00000000
1.0 0x3f800000
0.5 0x3f000000
3 0x40400000
+inf 0x7f800000 //正無窮
-inf 0xff800000 //負無窮
+NaN 0x7fc00000 or 0x7ff00000 //Not a Number