If we do the same question by storing the ans in the third string ,it is not giving any output

#1

#include
#include
using namespace std;

int main()
{
int test;
cin>>test;
while(test–)
{
string s[3];
for(int i=0;i<2;i++)
{ cin>>s[i];}

	for(int i=0;i<s[0].length();i++)
	{
		s[3][i]=((s[1][i]-'0')^(s[0][i]-'0'))+'0';
		//cout<<" "<<s[4][i]<<" ";
		}	
	//cout<<s[4 ][0];
	cout<<s[2]<<endl;
	
}

}

#2

Hey @Nidhi_Alipuria the problem is that you are not storing the answer correctly

  1. you should store it in s[2] not s[3]
  2. you should use s[2] += instead of s[2][i] = because there is no i’th character in s[2] to replace with

So replace
s[3][i]=((s[1][i]-‘0’)^(s[0][i]-‘0’))+‘0’;
by
s[2]+=((s[1][i]-‘0’)^(s[0][i]-‘0’))+‘0’;

#3

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