Double to Mixed Fractions

Solution.java

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

    public static void main(String[] args) {
    Scanner input = new Scanner(System.in);
    int n = input.nextInt();   
    for(int i = 0 ; i < n ; i++){
            double number = input.nextDouble();
            String s = Double.toString(number);
            s = "0" + s.substring(s.indexOf("."));
            double decimal = Double.parseDouble(s);
            int num = (int)number;
            if(number-num==0){
                System.out.println(-1);
            }else{
            int digits = s.substring(s.indexOf(".")).length()-1;
            int denominator = (int)Math.pow(10,digits);//10000
            int numerator= (int)(denominator * decimal);//3242
            for(int divisor = 2 ;divisor <= numerator;divisor++){
                   if(numerator % divisor==0 && denominator % divisor==0){ // if coommon divisor
                    numerator = numerator/divisor;
                    denominator = denominator/divisor;
                    divisor=2;
                   } 
            }
            
            System.out.println(num + " " + numerator + "/" + denominator);
        }
     }    
    
    }
}