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Challenges

Define a mathematical expression in English

+2
−0

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)

1 answer

+2
−0

C (gcc), 774 bytes

#define S strcat(o,
#define I(s)if(n)S s);else{S" ");return;}
#define B);break;case
n,N,s;char*i,o[999],*d[]={"zero ","one ","two ","three ","four ","five ","six ","seven ","eight ","nine ","ten ","eleven ","twelve ","thir","four","fif","six","seven","eigh","nine"},*t[]={"twenty","thirty","forty","fifty","sixty","seventy","eighty","ninety"},l[]="A";p(){if(n>99){S d[n/100]),S"hundred"),n%=100;I(" and ")}if(n>19){S t[n/10-2]);n%=10;I("-")}S d[n]);if(n>12)S"teen ");}main(int c,char**v){i=*++v;for(;*i;i++){if(*i>47&*i<58)n=10*n+*i-48,N=1;else if(*i==32);else if(*i>64)*l=*i&95,N=2,S" "+!s++),S l);else{S" "+!s++);N&1&&p(o);switch(*i-42){case 1:S"plus"B 3:if(N)S"minus");else S"negative"B 0:S"times"B 5:S"divided by"B 19:S"equals"B 9:;}n=N=0;}}if(N&1)S" "+!s),p();puts(o);}

This code takes input from the command line, and outputs on stdout.

Try it online!

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