How to convert a string of a decimal number from any base to a decimal number? [closed]

I'm looking to write a function that can convert a string with a given base to a decimal number.

Let's say the function is convert calling convert should give me the following output

convert

convert('3.14', base=10) ~= 3.14 convert('100.101', base=2) == 4.625

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SO is not a free coding site. If you are looking to write a function, please show some evidence of that. Right now it looks like you're looking to have a function written.

– Mad Physicist
Sep 15 '18 at 20:01

All your questions lack the part: what you tried so far ? None want to spend time to write code for you without seen you put effort in at least try something: write/type a variable name, name a function, define the function at least ...

– n1tk
Sep 15 '18 at 20:09

2 Answers
2

Python supports already. Simply use my_int = int(str, base)

my_int = int(str, base)

To convert floating-point numbers from one base to another, you can just break the number in half, handle the whole and the part separately, and then join them back together.

num = '100.101' base = 2 # split into whole and part whole = num[:num.index('.')] part = num[num.index('.') + 1:] # get the logarithmic size of the part so we can treat it as a fraction # e.g. '101/1000' denom = base ** len(part) # use python's built-in base conversion to convert the whole numbers # thanks @EthanBrews for mentioning this b10_whole = int(whole, base=base) b10_part = int(part, base=base) # recombine the integers into a float to return b10_num = b10_whole + (b10_part / denom) return b10_num

Thanks to the other answerer @EthanBrews for mentioning that integer stuff was already built-in. Unfortunately the same construction doesn't same to exist for float.

float

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