CODEWITHSUNDEEP
java
namsnath
namsnath

Reputation: 158

Changing A Decimal to a whole number (NOT Rounding Off)

So I am making an application that can solve problems with Empirical Formulae and I need some code that would do something like: If numbers are 2.5, 1, 3 it should change them to 2.5*2 = 5, 1*2 = 2, 3*2 = 6 so that the number with the decimal is converted to a whole number and the other numbers are adjusted appropriately.

I thought of this logic:

for(n = 1; (Math.round(simplestRat[0]) * n) != (int)SimplestRat[0]; n++)

to increment a counter that would multiply an integer to do what I want it to but I am skeptical about this code even at this phase and do not think it will work.

It would be a lot of help if someone could suggest a code for this or improve upon this code or even give me a link to another post for this problem as I was unable to find anything regarding this type of problem.

Any help is appreciated. Thanks

Upvotes: 1

Views: 142

Answers (1)

FelixMarcus
FelixMarcus

Reputation: 379

Okay, so you have to have a few steps. First, get them all into whole numbers. The easiest way is to find an appropriate power of ten to multiply them all by that leaves them as integers. This is a useful check: How to test if a double is an integer.

Then cast them to integers, and start working through them looking for common prime factors. This'll be a process similar to Eratosthenes' Sieve (http://en.wikipedia.org/wiki/Sieve_of_Eratosthenes) but with division at the end. For each prime, see if all 3 numbers divide by it exactly (modulo prime == 0). If they do, divide and reset the primes to 2. If they don't, next prime.

This should give you the lowest common ratio between the numbers. Any additional multiplier that came from the original stage is shaved off by the common primes method.

Upvotes: 1

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