Introduction
A simple extension that converts a decimal number to a fraction.
Version: 2
Blocks
DecimalToFraction
Converts a decimal to a fraction.
Returns: text
Parameters: number = number (double), separator = text
GetDenominator
Returns the denominator of the fraction from the decimal.
Parameters: number = double
GetNumerator
Returns the numerator of the fraction from the decimal.
Parameters: number = double
Can this be done with built-in blocks?
Yes and no. As @ABG and I found out in this post, it really depends on what decimal you are converting. For some reason, AI2 floats decimals that are smaller than 0.00001. Hence, I recommend you to use this extension - you don't know what the user inputs.
Downloads
TXT: Decimal2Fraction.txt (2.8 KB)
AIX: com.gordonlu.decimal2fraction.aix (6.4 KB)
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Made with Niotron IDE.
Kindly 
PM me if you have any questions! Also, if you like my extension, please 
like it! It takes some effort for me to make it...
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If you have any features that you want to add and you know the code, PM me.
11 Likes
Trouble logging in the extensions IDE 
the source code will be posted ASAP.
its ok no problem @gordonlu310
take your time to upload 
1 Like
This extension is now Open Source. Free to modify. Thank you!
package com.gordonlu.decimal2fraction;
import android.app.Activity;
import android.content.Context;
import com.google.appinventor.components.annotations.*;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.runtime.AndroidNonvisibleComponent;
import com.google.appinventor.components.runtime.ComponentContainer;
import com.google.appinventor.components.runtime.EventDispatcher;
import java.util.*;
@DesignerComponent(
version = 1,
description = "Converts a decimal into a fraction.",
category = ComponentCategory.EXTENSION,
nonVisible = true,
iconName = "https://docs.google.com/drawings/d/e/2PACX-1vQCI87PHLBF0jb8QWyYmIRQSjjNW3EFXf-qpsWCvBYkUQ9vEgPAB8SpxcMpblxNpbIYrjCjLrRLIU2c/pub?w=16&h=16")
@SimpleObject(external = true)
//Libraries
@UsesLibraries(libraries = "")
//Permissions
@UsesPermissions(permissionNames = "")
public class Decimal2Fraction extends AndroidNonvisibleComponent {
//Activity and Context
private Context context;
private Activity activity;
public Decimal2Fraction(ComponentContainer container){
super(container.$form());
this.activity = container.$context();
this.context = container.$context();
}
@SimpleFunction(description = "Turns a decimal into a fraction.")
public static String DecimalToFraction(double number, String separator) {
double intVal = Math.floor(number);
double fVal = number - intVal;
final long pVal = 1000000000;
long gcdVal = gcd(Math.round(fVal * pVal), pVal);
long num = Math.round(fVal * pVal) / gcdVal;
long deno = pVal / gcdVal;
return ((long)(intVal * deno) +
num + separator + deno);
}
@SimpleFunction(description = "Gets the numerator from the decimal.")
public static long GetNumerator(double number) {
double intVal = Math.floor(number);
double fVal = number - intVal;
final long pVal = 1000000000;
long gcdVal = gcd(Math.round(fVal * pVal), pVal);
long num = Math.round(fVal * pVal) / gcdVal;
long deno = pVal / gcdVal;
return ((long)(intVal * deno) +
num);
}
@SimpleFunction(description = "Gets the denominator from the decimal.")
public static long GetDenominator(double number) {
double intVal = Math.floor(number);
double fVal = number - intVal;
final long pVal = 1000000000;
long gcdVal = gcd(Math.round(fVal * pVal), pVal);
long num = Math.round(fVal * pVal) / gcdVal;
long deno = pVal / gcdVal;
return ((long)deno);
}
private static long gcd(long a, long b)
{
if (a == 0)
return b;
else if (b == 0)
return a;
if (a < b)
return gcd(a, b % a);
else
return gcd(b, a % b);
}
}
3 Likes
