Add decimal_to_binary.py

[ayushbisht2001]

Describe your change:

I have added an algorithm to find the binary string representation of decimal numbers.

• Add an algorithm?

Checklist:

• I have read CONTRIBUTING.md.
• This pull request is all my own work -- I have not plagiarized.
• I know that pull requests will not be merged if they fail the automated tests.
• This PR only changes one algorithm file. To ease review, please open separate PRs for separate algorithms.
• All new Python files are placed inside an existing directory.
• All filenames are in all lowercase characters with no spaces or dashes.
• All functions and variable names follow Python naming conventions.
• All function parameters and return values are annotated with Python type hints.
• All functions have doctests that pass the automated testing.
• All new algorithms have a URL in its comments that points to Wikipedia or other similar explanation.
• If this pull request resolves one or more open issues then the commit message contains Fixes: #{$ISSUE_NO}.

[algobytewise]

It seems to me that this performs the same function as the built-in function "bin".

[ayushbisht2001]

It seems to me that this performs the same function as the built-in function "bin".

Exactly,

[l3str4nge]

I don't see any decimal number in the tests. Please provide tests for numbers like 13.321312312

[joesinghh]

number need not be int, it can be float too since you have named your function as decimal_to_binary.
1 and 1.5 are both decimal numbers because 1 can also be written as 1.0 or 0.01 * 10**2.
if you are confused about decimal numbers check this Wikipedia link

[joesinghh]

Please write code that can actually convert decimal to binary, your code just converts int to binary. Even the build-in function bin can do that.

I have written a sample code to do so since I only have view permission, I want you to make some amendments.

a = ""
r = ""
count = 0
d = number - int(number)
number = int(number)
while(d and count<10):
     d = d*2
     r+=str(int(d))
     if int(d)==d:
            break
     else:
            d = d -int(d)
            count+=1
while number:
     a = str(number%2) + a
     number = number >> 1
a = a+"."+r
print(a)

[stale]

This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

Please reopen this pull request once you commit the changes requested or make improvements on the code. If this is not the case and you need some help, feel free to seek help from our Gitter or ping one of the reviewers. Thank you for your contributions!