c++ visual studio express Circle Class. Write a class name Circle , with the cla
ID: 669878 • Letter: C
Question
c++ visual studio express
Circle Class.
Write a class name Circle, with the class declaration in a file called Circle.h
and the
implementation in a file called Circle.cpp.
The class will have two data members, a double that holds the radius of the circle and a double called pi which will be set to the value, 3.14159 (data member cannot be set in the class declaration, pi should not be set via a parameter but set in the constructor).
The class must provide the following member functions:
Default Constructor – that sets the radius to 0.0
Constructor – that accepts the radius of the circle as an argument
setRadius – a mutator function for the radius variable
getRadius – an accessor function for the radius variable
getArea – calculates and returns (as double) the area of the circle using the formula
area = pi * radius * radius
getDiameter – calculates and returns (as double) the diameter of the circle using the formula
diameter = radius * 2
getCircumference – calculates and returns (as double) the circumference of the circle using the formula
circumference = 2 * pi * radius
Write a program that demonstrates the Circle class by asking the user for the circle’s radius and creating a Circle object and then reporting the circle’s area, diameter and circumference.
Two objects need to be created each using one of the two constructors (showing that both work along with the mutators and accessors).
Remember to comment within the code.
Explanation / Answer
class Circle{
double radius,pi;
public:
Circle(){
radius = 0;
pi = 3.14;
}
Circle(double r){
r = radius;
pi = 3.14;
}
void setRadius(double r){
radius = r;
}
double getRadius(){
return radius;
}
double getArea(){
return pi*radius*radius;
}
double getDiameter(){
return radius*2;
}
double getCircumference(){
return 2*pi*radius;
}
};
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