推荐回答(4个)
二进制转十进制,十进制转二进制的算法 十进制转二进制: 用2辗转相除至结果为1 将余数和最后的1从下向上倒序写 就是结果 例如302 302/2 = 151 余0 151/2 = 75 余1 75/2 = 37 余1 37/2 = 18 余1 18/2 = 9 余0 9/2 = 4 余1 4/2 = 2 余0 2/2 = 1 余0 故二进制为100101110 二进制转十进制 从最后一位开始算,依次列为第0、1、2...位 第n位的数(0或1)乘以2的n次方 得到的结果相加就是答案 例如:01101011.转十进制: 第0位:1乘2的0次方=1 1乘2的1次方=2 0乘2的2次方=0 1乘2的3次方=8 0乘2的4次方=0 1乘2的5次方=32 1乘2的6次方=64 0乘2的7次方=0 然后:1+2+0 +8+0+32+64+0=107. 二进制01101011=十进制107. 一、二进制数转换成十进制数 由二进制数转换成十进制数的基本做法是,把二进制数首先写成加权系数展开式,然后按十进制加法规则求和。这种做法称为"按权相加"法。 二、十进制数转换为二进制数 十进制数转换为二进制数时,由于整数和小数的转换方法不同,所以先将十进制数的整数部分和小数部分分别转换后,再加以合并。 1. 十进制整数转换为二进制整数 十进制整数转换为二进制整数采用"除2取余,逆序排列"法。具体做法是:用2去除十进制整数,可以得到一个商和余数;再用2去除商,又会得到一个商和余数,如此进行,直到商为零时为止,然后把先得到的余数作为二进制数的低位有效位,后得到的余数作为二进制数的高位有效位,依次排列起来。 2.十进制小数转换为二进制小数 十进制小数转换成二进制小数采用"乘2取整,顺序排列"法。具体做法是:用2乘十进制小数,可以得到积,将积的整数部分取出,再用2乘余下的小数部分,又得到一个积,再将积的整数部分取出,如此进行,直到积中的小数部分为零,或者达到所要求的精度为止。 然后把取出的整数部分按顺序排列起来,先取的整数作为二进制小数的高位有效位,后取的整数作为低位有效位。 回答者:HackerKinsn - 试用期 一级 2-24 13:31 1.二进制与十进制的转换 (1)二进制转十进制 方法:"按权展开求和" 例: (1011.01)2 =(1×23+0×22+1×21+1×20+0×2-1+1×2-2)10 =(8+0+2+1+0+0.25)10 =(11.25)10 (2)十进制转二进制 · 十进制整数转二进制数:"除以2取余,逆序输出" 例: (89)10=(1011001)2 2 89 2 44 …… 1 2 22 …… 0 2 11 …… 0 2 5 …… 1 2 2 …… 1 2 1 …… 0 0 …… 1 · 十进制小数转二进制数:"乘以2取整,顺序输出" 例: (0.625)10= (0.101)2 0.625 X 2 1.25 X 2 0.5 X 2 1.0 2.八进制与二进制的转换 例:将八进制的37.416转换成二进制数: 37 . 4 1 6 011 111 .100 001 110 即:(37.416)8 =(11111.10000111)2 例:将二进制的10110.0011 转换成八进制: 0 1 0 1 1 0 . 0 0 1 1 0 0 2 6 . 1 4 即:(10110.011)2 =(26.14)8 3.十六进制与二进制的转换 例:将十六进制数5DF.9 转换成二进制: 5 D F . 9 0101 1101 1111.1001 即:(5DF.9)16 =(10111011111.1001)2 例:将二进制数1100001.111 转换成十六进制: 0110 0001 . 1110 6 1 . E 即:(1100001.111)2 =(61.E)16
解:
(123)10
=(((0*1010+1)*1010+10)*1010+11)2
=((1*1010+10)*1010+11)2
=((1010+10)*1010+11)2
=(1100*1010+11)2
=(1111000+11)2
=(1111011)2
(0.3125)10
=((((101/1010+10)/1010+1)/1010+11)/1010)2
=((((0.1+10)/1010+1)/1010+11)/1010)2
=(((10.1/1010+1)/1010+11)/1010)2
=(((0.01+1)/1010+11)/1010)2
=((1.01/1010+11)/1010)2
=((0.001+11)/1010)2
=(11.001/1010)2
=(0.0101)2
(123.3125)10
=(1111011.0101)2
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