Python floating轉binary用法及代碼示例

Python 沒有提供任何內置方法來輕鬆地將浮點十進製數轉換為二進製數。所以，讓我們手動執行此操作。

方法：
要將浮點十進製數轉換為二進製，首先將整數部分轉換為二進製形式，然後將小數部分轉換為二進製形式，最後將兩個結果組合得到最終答案。
對於整數部分，繼續將數字除以 2 並記下餘數，除非被除數小於 2。如果是這樣，停止並將所有餘數複製在一起。
對於小數部分，繼續將小數部分乘以 2，直到並且除非 0 作為小數部分留下。第一次相乘後，記下整數部分，然後再次將新值的小數部分乘以 2。繼續這樣做，直到達到完美數字。

Above steps can be written as:
1(base 10) = 1(base 2) and .234(base 10) = .0011(base 2)
Now, to get the binary of 1.234, merge both results as a complete number.
(1)10 = (1)2 (.234)10 = (.0011)2 (1.234)10 = (1.0011...)2 (1.234)10 = (1.0011)2 [approx.]

下麵是實現：

Python3


# Python program to convert float
# decimal to binary number
  
# Function returns octal representation
def float_bin(number, places = 3):
  
    # split() separates whole number and decimal 
    # part and stores it in two separate variables
    whole, dec = str(number).split(".")
  
    # Convert both whole number and decimal  
    # part from string type to integer type
    whole = int(whole)
    dec = int (dec)
  
    # Convert the whole number part to it's
    # respective binary form and remove the
    # "0b" from it.
    res = bin(whole).lstrip("0b") + "."
  
    # Iterate the number of times, we want
    # the number of decimal places to be
    for x in range(places):
  
        # Multiply the decimal value by 2 
        # and separate the whole number part
        # and decimal part
        whole, dec = str((decimal_converter(dec)) * 2).split(".")
  
        # Convert the decimal part
        # to integer again
        dec = int(dec)
  
        # Keep adding the integer parts 
        # receive to the result variable
        res += whole
  
    return res
  
# Function converts the value passed as
# parameter to it's decimal representation
def decimal_converter(num): 
    while num > 1:
        num /= 10
    return num
  
# Driver Code
  
# Take the user input for 
# the floating point number
n = input("Enter your floating point value:\n")
  
# Take user input for the number of
# decimal places user want result as
p = int(input("Enter the number of decimal places of the result:\n"))
  
print(float_bin(n, places = p))

輸出：

Enter your floating point value:
1.234
Enter the number of decimal places of the result:
4

1.0011

Enter your floating point value:
11.234
Enter the number of decimal places of the result:
4

1011.0011

相關用法

注：本文由純淨天空篩選整理自retr0大神的英文原創作品 Python program to convert floating to binary。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。