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Challenges

Comments on Multiply complex numbers.

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Multiply complex numbers.

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Multiply complex numbers. 2 space-seperated ones will be input, as follows: (update: you can replace i with j or some other symbol if needed)

a+bi -a+bi a-bi -a-bi

where a and b are integers written in base 10.

You are expected to output in the same format.

For those unfamiliar: $i$ is the imaginary constant, the value of $\sqrt{-1}$, and a complex number is the sum of a real number and an imaginary number.

Shortest code following the rules wins.

EDIT: test cases:

  • 3+4i 4-5i -> 32+1i
  • -4+9i 2-2i -> 10+26i
  • -4+9i 2+2i -> -26+10i
  • -3+0i 10+0i -> -30+0i
  • 0+1i 0+1i -> -1+0i
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3 comment threads

Input format (2 comments)
Can we use our language's native complex number syntax (e.g. `j` instead of `i` for Python, or `ı` in... (2 comments)
First test case is incorrect (3 comments)
Input format
Quintec‭ wrote over 2 years ago · edited over 2 years ago

Why so restrictive with input format? Why not allow people to take in perhaps 2 complex numbers, or if that's too easy, two arrays of 2 numbers, or something like that? In addition, why so restrictive with output format? Different languages have different ways of representing complex numbers.

user‭ wrote over 2 years ago

I agree with Quintec. The input format is just plain cumbersome and adds nothing to the challenge. A lot of submissions are probably going to have to spend ~30% of their bytes on just parsing that. I'm not downvoting this challenge, but I'm not going to upvote it either.