C++ Classess Part 1 Date:- 28/08/2026

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

#include <iostream>

#include<bits/stdc++.h>

using namespace std;


class student{

    protected:

    int aa;

    public:

    string name;

    int age;

    // void display(int a=213,int cc,int bb=211){ .. This is wrong

    void display(int a=213,int bb=211){

        aa=a;

        cout<<name<<" "<<age<<endl;

        cout<<a<<endl;

        cout<<bb<<endl;

    }

    void ss();

};


void student::ss(){

    cout<<"Hello their"<<endl;

}




class a:student{

    public:

    void ii(int bb){

        aa=bb;

        cout<<aa<<endl;

    }

};


int add(int a,int b){

    cout<<a+b<<endl;

    return 1;

}

double add(int a,int b,int c){

    cout<<a+b+c<<endl;

    return 1.1;

}


template <typename t>

t addd(t a,t b){

    // cout<<a+b<<endl; // We cannot use cout in it

    return a+b;

}


int main() {

    // Write C++ code here

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


    student s;

    s.name="Gunjan Nayak";

    s.age=22;

    // s.a=21;

    s.display(21);

    s.ss();

    a b;

    // b.aa=12;

    b.ii(21);

    // b.ss();


    cout<<"REFERENCES"<<endl;

    int z=12;

    int y=21;

    int& x=z;

    x=y;

    // int &zz; // a reference must be initialized

    // x=21;

    // z=23;

    cout<<x<<endl;

    cout<<z<<endl;


    cout<<addd(12,12)<<endl;

    cout<<addd(12.34,3.14)<<endl;


    auto greet=[](){

        cout<<"Hello Gunjan"<<endl;

    };

    auto find=[](int a,int b)->int{

        return a+b;

    };

    int xx=21;

    auto nn=[xx](){

        cout<<xx<<endl;

    };

    int vv=23;

    auto cvt=[&vv](){

        vv=231;

    };


    auto veel=[=](){ // '=' captures everything means every variable.

    cout<<vv+xx<<endl;

    };

    auto capp=[&](){ // '&' captures everything by reference.

        vv=37;

    };

    cout<<find(12,12)<<endl;

    greet();

    nn();

    cvt();

    veel();

    capp();

    cout<<vv<<endl;

    vector<int> well={21,33,11,1,9,7,8};

    sort(well.begin(),well.end(),[](int a,int b){

        return a>b;

    });

    for(auto i:well){

        cout<<i<<endl;

    }



    return 0;

}

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