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Challenges

Define a mathematical expression in English

+2
−0

This challenge is currently under beta release. If given enough positivity, it will remain here and stand as a fully released challenge. Otherwise, it will be deleted and put back in the sandboxed post. Please fix the errors there instead.

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.
  • 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
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1 comment thread

Is it intentional that the standalone number is in words, but the numbers in expressions are in digit... (2 comments)

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