Here is my new code...Same error coming.
#include <stdio.h>
using namespace std;
int main() {
// your code goes here
int n,i=1;
scanf("%d",&n);
if(i<=n)
{
int x,y;
scanf("%d",&x);
scanf("%d",&y);
int r,a,b=y,j,t=x,rev=0,rev1=0,rev3=0,z=0,k;
for(j=x,k=y;j<=0,k<=0;j=j/10,k=k/10)
{
r=t%10;
t=x/10;
rev=rev*10+r;
a=b%10;
b=y/10;
rev1=rev1*10+a;
}
z=rev+rev1;
t=z;
for(j=z;j<=0;j=j/10)
{
r=t%10;
t=z/10;
rev3=rev3*10+r;
}
printf("%d",rev3);
i++;
}
return 0;
}