C++ 4 classes

 // Online C++ compiler to run C++ program online

#include <iostream>

// #include<string> // many compilers need string to be imported to work with string

using namespace std;

int main() {

    // Write C++ code here

    // std::cout << "Start small. Ship something.";

    /*

    int a=12;

    float b=3.14;

    double c=12.34l;

    char d='A';

    bool bol=false;

    string s="Gunjan Nayak";

    cout<<a<<endl;

    cout<<b<<endl;

    cout<<c<<endl;

    cout<<d<<endl;

    cout<<bol<<endl;

    cout<<s<<endl;*/

    // cout<<(d<<endl;

    // int c=12;

    // double d=c;

    // cout<<d<<endl;

    

    // double r=12.34;

    // cout<<r<<endl;

    // int s=(int)r;

    // cout<<s<<endl;

    

    // signed int a=-12;

    // cout<<a<<endl;

    // unsigned int a=-12;

    // cout<<a<<endl;

    // int a=12;

    // cout<<sizeof(a)<<endl;

    // short int c=12;

    // short c=12;

    // cout<<sizeof(c)<<endl;

    // long int a=12;

    // long a=12;

    // long long int a=12; // 8 bytes

    // long long a=12;

    // cout<<sizeof(a)<<endl;

    // const int a=12;

    volatile int a=12;

    a=23;

    cout<<a<<endl;

    

    return 0;

}

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