推荐回答(5个)
方法一:从右到左用二进制的每个数去乘以2的相应次方,小数点后则是从左往右
例:二进制数1101.01转化成十进制
1101.01(2)
=1*2【0】+0*2【1】+1*2【2】+1*2【3】 +0*2【-1】+1*2【-2】
=1+0+4+8+0+0.25=13.25(10)
方法二: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。
对于有n位整数,m位小数的二进制数用加权系数展开式表示,可写为:N(2)=an-1×2n-1+an-2×2n-2+……+a1×21+a0×20+a-1×2-1+a-2×2-2+……+a-m×2-m(10)式中aj表示第j位的系数,它为0和1中的某一个数。
例:二进制数1101转化成十进制
1101(2)
=1*2【3】+1*2【2】+0*2【1】+1*2【0】
=13(10)
注意:
1、【】括号内数字代表次方,如【2】为二次方,【-1】为负一次方。
2、()括号内代表进制数,(2)为二进制,(10)为十进制。
扩展资料:
以下为二进制转是进制代码:
int readint(int a) //a 是传入二进制位数
{
int sum = 0;
while (a--) {
sum *=2;
sum += getchar() - '0'; // getchar 读入相应十进制的每一位
}
return sum; // sum 是相应的十进制
}
参考资料来源:百度百科-十进制转二进制
有啊 但不可能一眼看出
10010110101可以看成是(从后往前读)
1*2^0+0*2^1+1*2^2+0*2^3+1*2^4……+1*2^10
算起来还是比较烦的。
十进制数——二进制数
例:64.125(10)= ? (2)
先看整数位
64/2=32……0
32/2=16……0
16/2=8……0
8/2=4……0
4/2=2……0
2/2=1……0
1/2=0……1
从下往上读,得到整数位为1000000;
再看小数位
0.125*2=0.25(个位数字为0,再取小数点后的数)
0.25*2=0.5 (个位数字为0)
0.5*2=1 (个位数字为1)
一直乘到所得数字正好为1为止,再自上往下依次读出所有的数,则
0.125(10)=0.001(2);
所以64.125(10)=1000000.0001
别有畏惧心理 呵呵
(我是学pascal的,个人衷心希望你也学pascal,NOIP用pascal的比用c++或C的多得多~)
自己再出几道题算一算吧!
用电脑里的计算器验算一下!
以16进制为桥梁
10转16再转2 或2转16再转10
10转16 也和 10转2 一样 就不在论述了
主要讲 2和16 的互转
2转16 要诀4位化1位 例如 10101111 可以先看成 1010 1111 然后用8421法则 像1010=8+0+2+0=12(10进制)=c(16进制)因此1010 1111换成16进制就是cf
16转2 就是1化4 反过来就行了
小子 你滴大大的明白?
咱们一般用十进制,就是加十个数进一位,二进制就是加两个数就进一位 1就是1, 2就是10 ,3就是101, 4就是110 ,5就是111 .....看出来规律了吧,其实并不难
要是用四位数表示就是0001 0010 0011 0101 0110
0111 咱们一般用十进制,就是加十个数进一位,二进制就是加两个数就进一位 1就是1, 2就是10 ,3就是101, 4就是110 ,5就是111 .....看出来规律了吧,其实并不难
要是用四位数表示就是0001 0010 0011 0101 0110
0111
of course
10010110101可以看成是(从后往前读)
1*2^0+0*2^1+1*2^2+0*2^3+1*2^4……+1*2^10
算起来还是比较烦的。
十进制数——二进制数
例:64.125(10)= ? (2)
先看整数位
64/2=32……0
32/2=16……0
16/2=8……0
8/2=4……0
4/2=2……0
2/2=1……0
1/2=0……1
从下往上读,得到整数位为1000000;
再看小数位
0.125*2=0.25(个位数字为0,再取小数点后的数)
0.25*2=0.5 (个位数字为0)
0.5*2=1 (个位数字为1)
一直乘到所得数字正好为1为止,再自上往下依次读出所有的数,则
0.125(10)=0.001(2);
所以64.125(10)=1000000.0001
别有畏惧心理 呵呵
自己再出几道题算一算吧!
用电脑里的计算器验算一下!
我相信,还有其他算法!
自己推敲吧。
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