《21天学通C++》第一周复习清单
书籍看这里：html">http://www.zzzyk.com/ebook/201007/19457.html
#include <iostream>
using namespace std;
enum CHOICE { DrawRect = 1, GetArea, GetPerim,
ChangeDimensions, Quit};
// Rectangle class declaration
class Rectangle
{
public:
// construcors
Rectangle(int width, int height);
~Rectangle();
// accessors
int GetHeight() const { return itsHeight; }
int GetWidth() const { return itsWidth; }
int GetArea() const { return itsHeight * itsWidth; }
int GetPerim() const { return 2*itsHeight + 2*itsWidth; }
void SetSize(int newWidth, int newHeight);
// Misc. methods
private:
int itsWidth;
int itsHeight;
};
// Class method implementations
void Rectangle::SetSize(int newWidth, int newHeight)
{
itsWidth = newWidth;
itsHeight = newHeight;
}
Rectangle::Rectangle(int width, int height)
{
itsWidth = width;
itsHeight = height;
}
Rectangle::~Rectangle() {}
int DoMenu();
void DoDrawRect(Rectangle);
void DoGetArea(Rectangle);
void DoGetPerim(Rectangle);
int main()
{
// initialize a rectangle to 30,5
Rectangle theRect(30,5);
int choice = DrawRect;
int fQuit = false;
while(!fQuit)
{
choice = DoMenu();
if(choice < DrawRect || choice > Quit)
{
cout << " Invalid Choice, please try again. ";
continue;
}
switch(choice)
{
case DrawRect:
DoDrawRect(theRect);
break;
case GetArea:
DoGetArea(theRect);
break;
case GetPerim:
DoGetPerim(theRect);
break;
case ChangeDimensions:
int newLength, newWidth;
cout << " New width: ";
cin >> newWidth;
cout << "New height: ";
cin >> newLength;
theRect.SetSize(newWidth, newLength);
DoDrawRect(theRect);
break;
case Quit:
fQuit = true;
cout << " Exiting... ";
break;
default:
cout << "Error in choice! ";
fQuit = true;
break;
}// end switch
}// end while
return 0;
}// end main
int DoMenu()
{
int choice;
cout << " *** Munu *** ";
cout << "(1) Draw Rectangle ";
cout << "(2) Area ";
cout << "(3) Perimeter ";
cout << "(4) Resize ";
cout << "(5) Quit ";
cin >> choice;
return choice;
}
void DoDrawRect(Rectangle theRect)
{
int height = theRect.GetHeight();
int width = theRect.GetWidth();
for(int i = 0; i<height; i++)
{
for(int j = 0; j<width; j++)
cout << "*";
cout << " ";
}
}
void DoGetArea(Rectangle theRect)
{
cout << "Area: " << theRect.GetArea() << endl;
}
void DoGetPerim(Rectangle theRect)
{
cout << "Perimeter: " << theRect.GetPerim() << endl;
}
补充：软件开发 , C++ ,
