#include<bits/stdc++.h>
#include<string.h>
using namespace std;
int main()
{
int t;
cin>>t;
while(t–)
{
string s1,s2;
cin>>s1>>s2;
int size=s1.length();
char s3[size];
for(int i=0;i<size;i++)
s3[i] = ((s1[i]-‘0’) ^ (s2[i]-‘0’)) + ‘0’;
for(int i=0;i<size;i++)
cout<<s3[i];
}
return 0;}
can u tell me the error in this code…or what modification is required