J04003

PhanSo.java
package Lop;

public class PhanSo {
    private long tu, mau;
    
    public PhanSo(long tu, long mau) {
        this.tu = tu;
        this.mau = mau;
    }
    
    public  String toString(){
        return tu + "/" + mau;
    }
    
    public void rutGon(){
        long x = usc(tu, mau);
        tu /= x;
        mau /= x;
    }
    
    private long usc(long a, long b){
        while(b>0){
            long t = a%b;
            a = b;
            b = t;
        }
        return a;
    }
}

Tesst.java
package Lop;

import java.util.*;

public class Tesst {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        PhanSo p = new PhanSo(in.nextLong(), in.nextLong());
        p.rutGon();
        System.out.println(p);
    }
}