Please correct the logical error

#1

and also specify the errors in the comments why not giving correct output for t>1

#2

import java.util.*;
public class Main
{
public static void main(String args[])
{
String s,s1;
int i,j,t;
Scanner sc=new Scanner(System.in);
t=sc.nextInt();
for(i=0;i<t;i++)
{
s=sc.next();
s1=sc.next();
// if(s.length()<=100)
// {
// for(i=0;i<s.length();i++)
// {
// if(s.charAt(i)==s1.charAt(i))
// System.out.print(“0”);
// else
// System.out.print(“1”);

			//  }
			 for(j=0;j<s.length();j++)
			 {
				 if(s.charAt(j)==s1.charAt(j))
				 System.out.print("0");
				 else
				 System.out.print("1");

				 
			 }
			 System.out.println();
		// }
	 }

}

}

#3

both inner and outer loop iterate with i
it’s not correct.

#4

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