SPOJ Adding Reversed Numbers

import java.util.*;


import java.math.*;





class Main


{


public static void main (String[] args)


{


Scanner in = new Scanner (System.in);


int t,tc,n=10;


tc = in.nextInt();

  

for (t=1;t<=tc;t++)


{


BigInteger a,b,x,y,s1=BigInteger.valueOf(0),s2=BigInteger.valueOf(0),p=BigInteger.valueOf(10),s,r=BigInteger.valueOf(0),m;


x=in.nextBigInteger(); y = in.nextBigInteger();


a=x;b=x;

   

while (a!=BigInteger.valueOf(0))


{


a = a.mod(p);


s1 = a.add(s1.multiply(p));


b = b.divide(p);


a=b;


}

   

//System.out.print(s1);

   

a=y;b=y;

   

while (a!=BigInteger.valueOf(0))


{


a = a.mod(p);


s2 = a.add(s2.multiply(p));


b = b.divide(p);


a=b;


}

   

s = s1.add(s2);


//System.out.print(s);


a = s ; b = s;

   

while (a!=BigInteger.valueOf(0))


{


a=a.mod(p);


r = a.add(r.multiply(p));


b = b.divide(p);


if (r == BigInteger.valueOf(0))


{


r = BigInteger.valueOf(0);


}

    

a = b;


}

   

System.out.println(r);


}


}


}