Struct Variable Query

#include<bits/stdc++.h>
using namespace std;
typedef struct trie
{
    int arr[26];
    bool isleaf;
    trie(int isleaf)
    {
        this->isleaf=9;
        cout<<isleaf<<endl;
        isleaf=false;
        cout<<isleaf<<endl;
        cout<<this->isleaf<<endl;
    }
}* tr;
//void inser(s)
int main()
{
   tr k=new trie(3);
   cout<<k->isleaf;
}

Works Fine and outputs 3 0 1 1

But in

#include<bits/stdc++.h>
using namespace std;
typedef struct trie
{
    int arr[26];
    bool isleaf;
    trie(int isleaf)
    {
        cout<<isleaf<<endl;
        isleaf=false;
        cout<<isleaf<<endl;
        cout<<this->isleaf<<endl;
    }
}* tr;
//void inser(s)
int main()
{
   tr k=new trie(3);
   cout<<k->isleaf;
}

I get 3 0 68 68

I understand that it is uninitialized but still why 68?

If use a normal bool either in global or inside function and print it without initializing i get 0,then why not here?

And can somebody also point out some good source to clear doubts about such variable declarations , public and private concepts , and OOPS, difference between structs and classes etc.