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Comments on Golf a FRACTRAN interpreter

Parent

Golf a FRACTRAN interpreter

+8
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Description

From the Esolangs wiki,

In Fractran,

  • a program consists of a finite list of positive, rational numbers.
  • The input to a program is a positive integer n.
  • The list is then searched in order, for a rational number $p/q$ such that $n×p/q$ is an integer.
  • Then n is replaced by $n×p/q$ and the search is restarted from the beginning of the list.
  • The program halts when no such number $p/q$ can be found, and the final n becomes the output from the program.
  • Output the final value of $n$.

Your task is to implement an interpreter for this language.

Input

You are to take two inputs:

  • $n$, an integer
  • $A$, an array of fractions, which may be taken as a list of pairs, or in the rational datatype of your language.

Output

A single integer, the final value of $n$.

Test Cases

Formatted as

program
input
output
78/55, 5/3, 1/5, 11/2, 5/7
1096135733
328842888196762472689573703

3/2
1296
6561

455/33, 11/13, 1/11, 3/7, 11/2, 1/3
72
15625
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General comments (4 comments)
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Python 3, 76 71 bytes

Saved 5 bytes thanks to user

def f(p,n):l=[n*p//q for(p,q)in p if n%q<1];return f(p,l[0])if l else n

Try it online!

This code assumes that the fractions are given as completely cancelled pairs of integers.

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General comments (1 comment)
General comments
user‭ wrote over 3 years ago

Nice! You can get 71 bytes