Class is a template definition of methods and variables in a particular kind of object . Thus, an object is a specific instance of a class; it contains real values instead of variables.

Class is use for bind data and its operated function together.

For external use its necessary to hidden the data and function. Or Class is the container of object.

Class Specification have two part::

Class Declaration
Class Function definitions

Class Declaration:

class class_name
{
private:
variable declarations;
 function declarations;
public:
variable declarations;
 function declarations;
};

The keyword class specified that what follow in an abstract data of type class_name. private and public are access modifier.

where private is visible with is the class where public data member is can be access with in the class and also outside the class.

class class_name
{
private:
int num1;
float num2;
public:
void getdata(int num1,float num2);
void putdata(void);
};

(追記) (追記ここまで)

Create Objects

Object is real time entity. Object have some attribute and also some feature.
Object can created with class name as-

class_name object_name;

(追記) (追記ここまで) And also created as:

class class_name
{
private:
int num1;
float num2;
public:
void getdata(int num1,float num2);
void putdata(void);
}
c1,c2,c3;

Class Function Definition

Member function can be defined in two ways:

Out Site the class definition
Inside the class definition

Outsite the class definition

return_type class_name:: function_name(argument declare)
{
 function body;
}

Inside the class definition

class class_name
{
private:
int num1;
	float num2;
public:
		void getdata(
		int num1,float num2) 
		 // inside class declaration
	{
cin>>num1;
cin>>num2;
	}
		void putdata(void); 
		// inside class declaration
{
cout<<num1;
cout<<num2;
}
}
c1,c2,c3; //object created.

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(追記) (追記ここまで)