import java.io.*;

import java.math.*;

import java.util.*;

public class Phanso

{

int ts,ms;

public Phanso()

{

ts=1;

ms=1;

}

public void nhap()

{

Scanner input = new Scanner(System.in);

System.out.println("Nhap tu so: ");

try

{

ts=input.nextInt();

}

catch(Exception e)

{

ts=0;

}

System.out.println("Nhap mau so: ");

try

{

ms=input.nextInt();

}

catch(Exception e)

{

ms=1;

}

}

public Phanso toigian()

{

Phanso a=new Phanso();

int x,y;

x=Math.abs(ts);

y=Math.abs(ms);

while(x!=y)

if(x>y) x=x-y;

else y=y-x;

a.ts=ts/x;

a.ms=ms/y;

return a;

}

public Phanso cong(Phanso y)

{

Phanso z=new Phanso();

z.ts=ts*y.ms+y.ts*ms;

z.ms=ms*y.ms;

return z.toigian();

}

public Phanso tru(Phanso y)

{

Phanso z=new Phanso();

z.ts=ts*y.ms-y.ts*ms;

z.ms=ms*y.ms;

return z.toigian();

}

public void xuat()

{

if (ts==0)

System.out.print("0");

else if(ms==0)

System.out.print("Phan so khong hop le");

else

System.out.print(ts+"/"+ms);

}

public static void main(String[] args)

Phanso a=new Phanso();

Phanso b=new Phanso();

Phanso kq=new Phanso();

System.out.println("Nhap phan so a");

a.nhap();

System.out.println("

Nhap phan so b");

b.nhap();

System.out.print("

Tong hai phan so: ");

kq=a.cong(b);

kq.xuat();

System.out.print("

Hieu hai phan so: ");

kq=a.tru(b);

kq.xuat();

}

}