oops recall, basic operations and nesting of member functions

 /*OOPS---> Classes and Objects

C++--> initially called as C with classes by stroustroup
Class--> extension of structures in C
Structures had limitations
    - members are public
    - a function cannot be created inside structure
    - no methods
Classes --> Structures + more
Classes --> can have methods and properties
Classes --> can make few members as private and few as public
Structues in c++ are typedef (mtlb typedef na lgakr bi structures ke varibales
define kre to vo hojaenge)
you can declare objects along with class declaration like this:
    class Employee {
          class definition
          } krishna, shalini;
harry.salary = 9 makes no sense if salary is private
*/

/************NESTING OF MEMBER FUNCTIONS******** */

#include<iostream>
using namespace std;

// int main(){
   
//     binary b;
//     b.read();
//     b.check_binary();
//     b.display();
//     b.ones_compliment();
//     b.display();

//     return 0;
// }

class binary
{
private:
    string s;
    //void check_binary(void);  //ye chal jaega agar hum nesting krenge but agar bina nesting
    //ke main function m call krenge to nhi chlega
public:
    void read(void);
    void check_binary(void);
    void ones_compliment(void);
    void display(void);


};

#include<iostream>
using namespace std;

int main(){
   
    binary b;
    b.read();
    b.check_binary();
    b.display();
    b.ones_compliment();
    b.display();

    return 0;
}

void binary :: read(void)
{
    cout<<"Enter a binary number";
    cin >> s;
}

void binary :: check_binary(void){

    for (int i=0; i<s.length(); i++)
    {
        if ((s.at(i)) != '0' && s.at(i) != '1')
        {
            cout<<"The binary format is incorrect"<<endl;
            exit(0);
        }
    }
}

void binary :: ones_compliment(void)
{
    //check_binary();//this is nesting of member function
     for (int i=0; i<s.length(); i++)
     {
        if (s.at(i) == '0')
        {
            s.at(i) = '1';
        }
        else{
            s.at(i) = '0';
        }
     }
}

void binary :: display(void)
{
    cout<<"Displaying your binary number "<<endl;
    for (int i=0; i< s.length(); i++)
    {
        cout<<s.at(i);
    }
}

#include<iostream>
using namespace std;

// int main(){
   
//     binary b;
//     b.read();
//     b.check_binary();
//     b.display();
//     b.ones_compliment();
//     b.display();

//     return 0;
// }

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