[Solved] Not getting output in case of string

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You are using an uninitialized string, so assigning a to s[0] does nothing or does undefined behavior. To do this, you have to give s a size, as the options below:

Option 1: Resize

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string s;
    s.resize(10);
    s[0] = 'a';
    cout << s << endl;
    return 0;
}

Option 2: Push Back

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string s;
    s.push_back('a');
    cout << s << endl;
    return 0;
}

Option 3: +=

#include <bits/stdc++.h>
using namespace std;

int main()
{
    string s;
    s += 'a';
    cout << s << endl;
    return 0;
}

There are more options, but I won’t put them here. (one might be append)

solved Not getting output in case of string