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Challenges

Comments on Define a mathematical expression in English

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Define a mathematical expression in English

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Background

Inspired by this challenge that is also a mathematical English translator.

Challenge

Write a program that translates a mathematical expression using English with the following specifications:

  • The expression can only take in numbers, letters from the English alphabet, the equal sign, and the arithmetic operators. No, exponents aren't arithmetic.
  • If the target character(s) is a/are number(s):
    • The number range can only be from -999 up to 999.
    • When in the tens place, use the dash (-) when there are spaced numberings. For example, 21 is twenty-one.
    • When in the hundreds place, add and to the string if the tens and/or the ones place aren't empty. For example, 125 is one hundred and twenty-five.
    • If the number is negative, use negative before the number. For example, -13 is negative thirteen.
  • If the target character is a letter:
    • The input should only take 1 letter.
    • When put on the result, the letter must be capitalized.
  • If the target character is a symbol:
    • + is plus.
    • - is minus.
    • * is times.
    • / is divided by.
    • = is equals or is equal to.
  • Parentheses shouldn't be inputted.
  • Whitespaces are ignored.
  • Any character that's not part of the specification is ignored.
  • Trailing whitespaces and newlines are allowed.
  • This is code-golf, so the shortest program for each language wins!

Test Cases

// Input
# Output

14
fourteen

1+2
one plus two

53 /3
fifty-three divided by three

6 +2* 7 =20
six plus two times seven equals twenty

8*8*8 * 8 * 8 -1
eight times eight times eight times eight times eight minus one

= 4
is equal to four

x + y = z
X plus Y equals Z

-5 +- 6
negative five plus negative six

Testcases by [**@celtschk**](https://codegolf.codidact.com/comments/thread/4623#comment-13896):

500
five hundred

129
one hundred and twenty-nine

0+0=0
zero plus zero equals zero

0 -- 0 = 0
zero minus negative zero equals zero
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3 comment threads

Is it OK to sometimes have a trailing space? (5 comments)
Additional testcases (2 comments)
Is it intentional that the standalone number is in words, but the numbers in expressions are in digit... (2 comments)
Additional testcases
celtschk‭ wrote over 2 years ago · edited over 2 years ago

On testing my code for this (not yet finished), I've noticed that three-digit numbers are not tested; also the number zero is easy to get wrong. I suggest adding the following test cases:

500
five hundred

129
one hundred and twenty-nine

0+0=0
zero plus zero equals zero

0 -- 0 = 0
zero minus negative zero equals zero
General Sebast1an‭ wrote over 2 years ago

celtschk‭ Thanks for these testcases.