Constant Parameters and Member Functions

Certain member functions of a class, access the class data members without modifying them. It is advisable to declare such functions as const functions. The syntax for declaring const member functions is shown as follows:

Return_type function_name (argument) const

Sample Program

#include <iostream. h>

class con

{

int eno;

float sal;

public:

void setdata(int x, float y)

{

eno = x;

sal = y;

}

void display(void) const

{

cout<<”Employee Number “<<eno<<endl;

cout<<”Employee Salary “<<sal<<endl;

}

};

void main()

{

con A;

A.setdata( 10,4500.50);

A.display();

}