Get the simple fraction of decimal number c#

Question

I need to get the simple fraction of a decimal number in c#

Example:

1 would be 1 /1
16 would be 16 / 1
0.125 would be 1 / 8
.30769231 would be 4/13

The solution i found is this:

Decimal_target= 0.1

In the numerator and denominator for the decimal values i used (Decimal_target*(random number between 1- 10)/random number)

The random number got was 9 so: ((0.1*9)/9)=0.1

Numerator = 0.9
Denominator = 9

But the numerator and denominator needs to be integer numbers...

https://www.mathsisfun.com/converting-decimals-fractions.html — Broots Waymb, Apr 22 '20 at 15:13
This seems more like a simple math problem whose solution could be found from a quick internet search than a C# programming question. — Code Stranger, Apr 22 '20 at 15:14
Why are you picking a random number? Talk us through your logic there... — Idle_Mind, Apr 22 '20 at 15:24
Random number has no reason, just pick a random number to do (Decimal_target*(random number between 1- 10)/random number) This would get the actual decimal target — Chris, Apr 22 '20 at 15:45

score 0 · Accepted Answer · answered Apr 22 '20 at 17:03

Here is sample code. Can get stuck in infinite loop (let OP solve this issue). I rounded to number of decimal places in input :

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml;
using System.Xml.Linq;
using System.Data;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            string[] numbers = { "1", "16", "0.125", ".30769231" };

            foreach (string number in numbers)
            {
                int numerator = 1;
                string strNumerator = "";
                int denominator = 1;
                string strDenominator = "";


                Boolean done = false;

                if (!number.Contains("."))
                {
                    strNumerator = number;
                    strDenominator = "1";
                    done = true;
                }
                else
                {
                    int numberDecimalPlaces = number.Substring(number.IndexOf(".")).Length - 1;
                    string tempStr = number;
                    if (number.StartsWith(".")) tempStr = "0" + tempStr;
                    double value = double.Parse(number);

                    while(!done)
                    {
                        while (true)
                        {
                            double newTemp = numerator / (double)denominator;
                            string newTempStr = newTemp.ToString("F" + numberDecimalPlaces.ToString());
                            if (newTempStr == tempStr)
                            {
                                strNumerator = numerator.ToString();
                                strDenominator = denominator.ToString();
                                done = true;
                                break;
                            }
                            denominator++;
                            if (newTemp <= value)
                            {
                                numerator += 1;
                                denominator = numerator + 1;
                                break;
                            }

                        }

                    }

                }
                Console.WriteLine("Results for : '{0}', numerator = '{1}', denominator = '{2}'", number, strNumerator, strDenominator);
            }
            Console.ReadLine();
        }
    }

}

Get the simple fraction of decimal number c#

1 Answers1