you can refer this code in Java.
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.util.Scanner;
//http://www.spoj.com/problems/ADDREV/
public class Bai02 {
public static void main(String[] args) throws FileNotFoundException {
int T, a, b, S;
Scanner s = new Scanner(System.in);
s = new Scanner(new FileInputStream("input_bai02.txt"));
T = s.nextInt();
for (int i = 1; i <= T; i++) {
a = s.nextInt();
b = s.nextInt();
S = reverseNumber(a) + reverseNumber(b);
System.out.println(reverseNumber(S));
}
s.close();
}
// method to reverse number input
static int reverseNumber(int valueInput) {
String str = "";
while (valueInput > 0) {
str += valueInput % 10;
valueInput /= 10;
}
return Integer.parseInt(str);
}
}