Question:
Hi everyone Im very new to c++ and may be in over my head on this problem im trying to solve. A good visual explanation and solution to my errors or even better a revised source code is all that I ask of. Thanks to everyone who invest there interest into my question.
Heres the problem: Design a class named rectangle to represent a rectangle. The class must contain:
- Two double data fields named width and height that specify the width and height of the rectangle.
- A no-arg constructor that creates a default rectangle with width 1 and height 1.
- A constructor that creates a rectangle with the specified width and height
- The accessor and mutator functions for all data fields
- The function named get Area() that returns the area of this rectangle
- A function named getPerimeter() that returns the peremter.
Draw the UML diagram for the class. Implement the class. Write a test progranm that creates two rectangle obejects. Assign width 4 and height 40 to the first object and width 3.5 and height 35.9 to the second. Display the properties of both objects and find their areas and perimeters.
Heres what I have so far:
#include <iostream> using namespace std; class Rectangle { public: double height; public: double width; Rectangle() { width = 4; } rectangle(double newArea) double height; height() ( height = 40 { { area = height* width; } double getArea() { return Area; } bool isOn() { return on; } double getPerimeter() { return Perimeter; } void setPerimeter(double radius) cout << "The area of the Rectangle" << rectangle1.area<<"is"<<rectangle1.getArea()<< endl; cout<<"The area of the Rectangle" <<rectangle.area2.area<<"is"<<rectangle2.getArea()<<endl; return 0; }
Solution:1
If you'd like to learn whats going on here, check this out
#include <iostream> using namespace std; class Rectangle{ private: // In nearly all cases you want to keep your member variables private double height; // This allows you to be certain of how they are accessed. double width; // This provides a level of security to the class. public: // Only need one public: // Constructors are called when you define a new variable of type Rectangle Rectangle() // No arguments means this constructor takes no extra input when called. { width = 1.0; // Sets width and height to 1 height = 1.0; } Rectangle(double a_width, double a_height) { // Constructor needs exact(case-sensitive) match of class-name /* Set width and hieght to the arguments passed into the constructor in here.*/ } // Accessor / Mutator methods are more easily called get/set methods. double getHeight(){ // Get height called on rectangle class return height; // Returns the value of the class member "height" } /*Make a method to get the width here.*/ // In c++ you can return the results of equations directly // i.e. // int x = 2; // return x*x; // returns 4 // Try something simliar for getArea() and getPerimeter(); double getArea() const { return /*area equation goes here*/ ; } double getPerimeter() const { return /*perimeter equation goes here*/; } } // You should split these displaying statements into the main function, // Which is what you meant to do, right? ;) int main(){ // In order to use your new class, you need to declare a variable of its type Rectangle rectangle1; // When you declare a new variable without any arguments its default constructor is called. // This means that the rectangle class decides to use the height = 1; width = 1; constructor from above. // You can check this using your getHeight() and getWidth(), when you implement them. cout << "The area of the Rectangle is" << rectangle1.getArea() << endl; return 0; } Ah reminds me of TAing CSCI1100
Solution:2
Here is a working solution,
Source Code:
#include <iostream> using namespace std; class Rectangle { private: double width; double height; public: Rectangle(double w=1, double h=1); double getWidth(); void setWidth(double w); double getHeight(); void setHeight(double h); double getArea(); double getPerimeter(); }; Rectangle::Rectangle(double w, double h):width(w),height(h) {} double Rectangle::getWidth() { return width; } void Rectangle::setWidth(double w) {width = w; } double Rectangle::getHeight() { return height; } void Rectangle::setHeight(double h) { height = h; } double Rectangle::getArea() { return width*height; } double Rectangle::getPerimeter() { return 2*(width+height); } int main() { Rectangle r1(4,40); Rectangle r2(3.5,35.9); cout << "Rectangle #1 :: width[" << r1.getWidth() << "] height[" << r1.getHeight() << "] area[" << r1.getArea() << "] perimeter[" << r1.getPerimeter() << "]" << endl; cout << "Rectangle #2 :: width[" << r2.getWidth() << "] height[" << r2.getHeight() << "] area[" << r2.getArea() << "] perimeter[" << r2.getPerimeter() << "]" << endl; } Output:
Rectangle #1 :: width[4] height[40] area[160] perimeter[88] Rectangle #2 :: width[3.5] height[35.9] area[125.65] perimeter[78.8]
Solution:3
Step 1: Remove all code that isn't in the spec:
class Rectangle { private: double height; double width; public: Rectangle() { // fill in code here } Rectangle(double width, double height) { // fill in code here } double getArea() { // fill in code here } double getPerimeter() { // fill in code here } double getWidth() { // fill in code here } void setWidth(double newWidth) { // fill in code here } double getHeight() { // fill in code here } void setHeight(double newHeight) { // fill in code here } }; The rest of your code is just making this more complicated. You don't need an area or perimeter variable, and a constructor accepting an area as an argument doesn't make sense (you seem to be treating your rectangle like a circle).
Solution:4
//This Is The Complete Program A Run This 10 Time on VC++ For More check //For More Code and Information and News www.exploretomorrow.blogspot.com #include <iostream> using namespace std; class Rectangle // Class Rectangle { public: Rectangle(float L, float W); // Constructor float getLength(){return length;} void setLength(float L); float getWidth(){return width;} void setWidth(float W); double perimeter(void){return (length*2 + width*2);} // Perimeter function double area(void) {return (length*width);} // Area funcion private: float L, W, length, width; }; // End of class Rectangle Rectangle::Rectangle(float L, float W) // Scope function { length=L; width=W; } void Rectangle::setWidth(float W)//I'd like to change this to a do/ while loop?? { if ((W < 0.0) || (W > 20.0)) { width = 1.0; } else { width = W; } return; } float getWidth() { return W;//Is this right? } void Rectangle::setLength(float L)//same here-do/while loop? { if ((L < 0.0) || (L > 20.0)) { length = 1.0; } else { length = L; } return; } float getLength() { return L; } void Rectangle::get(float L, float W) { } double Rectangle:perimeter(float L, float W) { perimeter = (2*L) + (2*W); cout << "The perimeter of the rectangle is: " << perimeter << endl; } double Rectangle::area(float L, float W) { area = L*W; cout << "The area of the rectangle is : " << area << endl; } int main() // main() I'm sure something is wrong here. // I understand the main function, but when I use classes I get confused... { rectangle MyRectangle; cout << "Please enter the length of the rectangle: " << endl; cin >> MyRectangle.getlength >> endl; cout << "Please enter the width of the rectangle: " << endl; cin >> MyRectangle.getwidth >> endl; return 0; } // End of main() Note:If u also have question or solution just comment us below or mail us on toontricks1994@gmail.com
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