What is a class?
A class in C++ is a user-defined data type that consists of data member and member functions. A class leads the programming towards object-oriented programming. Data members are the variables that store the data, and member functions are the user-defined functions that manipulate the variables. Class is declared using the “class” keyword.
Syntax :
<![CDATA[ class class_name{
Access specifier :
Data members/variables;
Member functions {}
}; ]]>
A class in C++ is a user-defined data type that consists of data member and member functions. A class leads the programming towards object-oriented programming. Data members are the variables that store the data, and member functions are the user-defined functions that manipulate the variables. Class is declared using the “class” keyword.
- Public: public refers to that everyone can access class data without any limit.
- Protected: protected means that not everyone can access the data of the class, only the classes inherited from that class or the child classes of that class can access the data.
- Private: private means no one can access the data present in the private section. Only the methods currently in that class can access the data.
Example:
<![CDATA[
#include <iostream>
using namespace std;
class knowledge2life
{
// Access specifier
public:
// Member Data
string str;
// Member Functions()
void display()
{
cout << "welcome to " << str;
}
};
int main() {
// Declare an object of class knowledge2life
knowledge2life obj1;
// accessing data member
obj1.str = "knowledge2life.com";
// accessing member function
obj1.display();
return 0;
}
]]>
OUTPUT:
Here you can see the variable a is in the public section, so it can be public and the display() method is in the public area so that everyone can access it.
