python中的二进制到十进制，反之亦然-yiteyi-C++库

编写Python代码，将十进制数转换为等价的二进制数，反之亦然。

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例子：

From decimal to binaryInput : 8Output : 1 0 0 0From binary to decimalInput : 100Output : 4

推荐：请尝试你的方法 {IDE} 首先，在进入解决方案之前。

十进制到二进制

Keep calling conversion function with n/2  till n > 1,later perform n % 1 to get MSB of converted binary number.  Example :- 71). 7/2 = Quotient = 3(greater than 1), Remainder = 1.2). 3/2 = Quotient = 1(not greater than 1), Remainder = 1.3). 1%2 = Remainder = 1.Therefore, answer is 111.

Python3

                         # Function to print binary number for the                       
                         # input decimal using recursion                       
                         def                                     decimalToBinary(n):                       
           
                                                 if                                     (n >                                     1                                     ):                       
                                                 # divide with integral result                       
                                                 # (discard remainder)                       
                                                 decimalToBinary(n                                     /                                     /                                     2                                     )                       
           
                                   
                                                 print                                     (n                                     %                                     2                                     , end                                     =                                     ' '                                     )                       
                                   
                                   
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     '__main__'                                     :                       
                                                 decimalToBinary(                                     8                                     )                       
                                                 print                                     (                                     ""                                     )                       
                                                 decimalToBinary(                                     18                                     )                       
                                                 print                                     (                                     ""                                     )                       
                                                 decimalToBinary(                                     7                                     )                       
                                                 print                                     (                                     ""                                     )                       

输出：

1 0 0 0 1 0 0 1 0 1 1 1

使用bin（）将十进制转换为二进制：

Python3

                         # Function to convert Decimal number                       
                         # to Binary number                       
           
                         def                                     decimalToBinary(n):                       
                                                 return                                     bin                                     (n).replace(                                     "0b"                                     ,"")                       
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     '__main__'                                     :                       
                                                 print                                     (decimalToBinary(                                     8                                     ))                       
                                                 print                                     (decimalToBinary(                                     18                                     ))                       
                                                 print                                     (decimalToBinary(                                     7                                     ))                       

输出：

100010010111

二进制到十进制

Example -: 10111). Take modulo of given binary number with 10.     (1011 % 10 = 1)2). Multiply rem with 2 raised to the power    it's position from right end.     (1 * 2^0)    Note that we start counting position with 0. 3). Add result with previously generated result.    decimal = decimal + (1 * 2^0)4). Update binary number by dividing it by 10.    (1011 / 10 = 101)5). Keep repeating upper steps till binary > 0.Final Conversion -: (1 * 2^3) + (0 * 2^2) +                 (1 * 2^1) + (1 * 2^0) = 11

Python3

                         # Function calculates the decimal equivalent                       
                         # to given binary number                       
           
                         def                                     binaryToDecimal(binary):                       
                                   
                                                 binary1                                     =                                     binary                       
                                                 decimal, i, n                                     =                                     0                                     ,                                     0                                     ,                                     0                       
                                                 while                                     (binary !                                     =                                     0                                     ):                       
                                                 dec                                     =                                     binary                                     %                                     10                       
                                                 decimal                                     =                                     decimal                                     +                                     dec                                     *                                     pow                                     (                                     2                                     , i)                       
                                                 binary                                     =                                     binary                                     /                                     /                                     10                       
                                                 i                                     +                                     =                                     1                       
                                                 print                                     (decimal)                       
                                   
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     '__main__'                                     :                       
                                                 binaryToDecimal(                                     100                                     )                       
                                                 binaryToDecimal(                                     101                                     )                       
                                                 binaryToDecimal(                                     1001                                     )                       

输出：

使用int（）将二进制转换为十进制：

Python3

                         # Function to convert Binary number                       
                         # to Decimal number                       
           
                         def                                     binaryToDecimal(n):                       
                                                 return                                     int                                     (n,                                     2                                     )                       
           
           
                         # Driver code                       
                         if                                     __name__                                     =                                     =                                     '__main__'                                     :                       
                                                 print                                     (binaryToDecimal(                                     '100'                                     ))                       
                                                 print                                     (binaryToDecimal(                                     '101'                                     ))                       
                                                 print                                     (binaryToDecimal(                                     '1001'                                     ))                       

输出：

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