How to convert decimal to fractions?

Question

What I need to convert decimal to fractions. It is easy to convert to 10\'s feet.

1.5 => 15/10

This can do via this code:

Answer 1

Not only for the decimal number 1.5, for all you can use the following steps:

1. Find Number of decimal digits:

   double d = 1.5050;//Example I used

   double d1 = 1;

   String text = Double.toString(Math.abs(d));

   int integerPlaces = text.indexOf('.');

   int decimalPlaces = text.length() - integerPlaces - 1;

   System.out.println(decimalPlaces);//4

2. Then convert to integer:

   static int ipower(int base, int exp) {

       int result = 1;
       for (int i = 1; i <= exp; i++) {
           result *= base;           
       }            
       return result;
   }
   

   //using the method

   int i = (int) (d*ipower(10, decimalPlaces));

   int i1 = (int) (d1*ipower(10, decimalPlaces));

   System.out.println("i=" + i + " i1 =" +i1);//i=1505 i1 =1000

3. Then find highest common factor

   private static int commonFactor(int num, int divisor) {

       if (divisor == 0) {
           return num;
       }
   
       return commonFactor(divisor, num % divisor);
   }
   

//using common factor

int commonfactor = commonFactor(i, i1);

System.out.println(commonfactor);//5

4. Finally print results:

   System.out.println(i/commonfactor + "/" + i1/commonfactor);//301/200

Here you can find:

  public static void main(String[] args) {

        double d = 1.5050;
        double d1 = 1;

        String text = Double.toString(Math.abs(d));
        int integerPlaces = text.indexOf('.');
        int decimalPlaces = text.length() - integerPlaces - 1;

        System.out.println(decimalPlaces);
        System.out.println(ipower(10, decimalPlaces));

        int i = (int) (d*ipower(10, decimalPlaces));
        int i1 = (int) (d1*ipower(10, decimalPlaces));      

        System.out.println("i=" + i + " i1 =" +i1);

        int commonfactor = commonFactor(i, i1);
        System.out.println(commonfactor);

        System.out.println(i/commonfactor + "/" + i1/commonfactor);


    }

    static int ipower(int base, int exp) {
        int result = 1;
        for (int i = 1; i <= exp; i++) {
            result *= base;           
        }

        return result;
    }

    private static int commonFactor(int num, int divisor) {
        if (divisor == 0) {
            return num;
        }
        return commonFactor(divisor, num % divisor);
    }