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| Use of Scope Resolution Operator |
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1 // This program demonstrates a simple class with member functions
2 // defined outside the class declaration.
3 #include <iostream>
4 #include <cmath>
5 using namespace std;
6
7 // Circle class declaration
8 class Circle
9 { private:
10 double radius; // This is a member variable.
11
12 public:
13 void setRadius(double); // These are just prototypes
14 double getArea(); // for the member functions.
15 };
16
17 // The member function implementation section follows. It contains the
18 // actual function definitions for the Circle class member functions.
19
20 /*******************************************************************
21 * Circle::setRadius *
22 * This function copies the argument passed into the parameter to *
23 * the private member variable radius. *
24 *******************************************************************/
25 void Circle::setRadius(double r) // Use of Scope Resolution Operator
26 { radius = r;
27 }
28
29 /******************************************************************
30 * Circle::getArea *
31 * This function calculates and returns the Circle object's area. *
32 * It does not need any parameters because it already has access *
33 * to the member variable radius. *
34 ******************************************************************/
35 double Circle::getArea() // Use of Scope Resolution Operator
36 { return 3.14 * pow(radius, 2);
37 }
38
39 /******************************************************************
40 * main *
41 ******************************************************************/
42 int main()
43 {
44 Circle circle1, // Define 2 Circle objects
45 circle2;
46
47 circle1.setRadius(1); // This sets circle1's radius to 1
48 circle2.setRadius(2.5); // This sets circle2's radius to 2.5
49
50 // Get and display each circle's area
51 cout << "The area of circle1 is " << circle1.getArea() << endl;
52 cout << "The area of circle2 is " << circle2.getArea() << endl;
53
54 return 0;
55 }
Please First try Dry_running this program and then compile to check your efficiency .
This is dummy text. It is not meant to be read. Accordingly, it is difficult to figure out when to end it. But then, this is dummy text. It is not meant to be read. Period.
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