https://blog.csdn.net/ynxts/article/details/112342463
https://blog.csdn.net/weixin_45863060/article/details/125054244
怎样将小数转化成二进制数：
2.5 0000 0010.101 10.1
2.6 0000 0010.110 10.1001100110011001……
2.51 0000 0010.1100 11
128 64 32 16 8 4 2 1 0.5 0.25 0.125 0.0625 0.03125
0.5*2=1
0.6*2=>1.2 1
0.2*2=0.4 0
0.4*2=0.8 0
0.8*2=1.6 1
0.6
0.6=1*0.5+0*0.25+0*0.125+1*0.0625+1*0.03125+
0000 0010.1001100110011001100110011001……
0000 001.01001100110011001100110011001……*2
10.0=1.0*10
1.01001100110011001100110011001……*
0 1000 0000 0 1001 1001 1001 1001 1001 10
+ E:128-127=1 M:1. 0 1001 1001 1001 1001 1001 10
+M*2^E=1. 0 1001 1001 1001 1001 1001 10*2=1 0. 1001 1001 1001 1001 1001 10
2+0.5+0.0625+0.03125+=2.59……