Why this code is not showing any output

#1

#include
#include
using namespace std;
int main() {
int t;
cin>>t;
while(t–)
{
string s1;
string s2;
string s3;
cin>>s1;
cin>>s2;
int i=0,j=0,k=0;
while(i<s1.length() && j<s2.length())
{
if(s1[i]==s2[j])
{
s3[k]=‘0’;
}
else
{
s3[k]=‘1’;
}
i++;
j++;
k++;
}
cout<<s3;
}
return 0;
}

#2

@Kunalgoyal
Actually the problem is initial length of s3 is zero. So s3[k] is not define. You cann’t directly initial any index of s3. Instead of doing s3[k]=‘0’ or s3[k]=‘1’ what you can do is change them to s3+=‘0’; and s3+=‘1’; respectively

#3

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