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

posted over 4 years ago

CC BY-SA 4.0

2y ago by trichoplax‭

General Sebast1an‭

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