//小数转分数

 //0.3 -> 3/10, 0.25 -> 1/4

 public class dicimalToFraction{

     public static void main(String [] args){

         double a = 0.3;

         double b = 0.25;

         System.out.println(dicimalToFraction(a));

         System.out.println(dicimalToFraction(b));

     }

     public static String dicimalToFraction(double num){

         int count = 0;

         int base = 10;

         while(num != Math.floor(num)){

             num *= base;

             count++;

         }

         base = (int)Math.pow(base,count);

         int nor = (int)num;

         int gcd = findGCD(nor, base);

         return String.valueOf(nor/gcd) + "/" + String.valueOf(base/gcd);

     }

     //求最大公约数

     private static int findGCD(int a, int b){

         if(a == 0){

             return b;

         }

         return findGCD(b%a, a);

     }

 }