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Peeping Tom
Joined: 15 Feb 2006
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 Posted: Fri Jul 28, 2006 12:17 am Post subject: What's wrong with this C++ code? |
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I know Dave's ESL maybe isn't the best place for such a post, but there seem to be a few people who know a bit about computers, so maybe someone can help.
I just started learning C++, and this is the code from the book I'm using. Actually, when I typed it, it wouldn't compile, so I downloaded the source from the book's supplementary webpage. It still didn't compile. Can someone help explain why? If I make it a remark, the error just continues on the following line.
I marked the first compiling error in red. The compiler I'm using is Dev-C++ version 4.9.8.0.
| Quote: |
/* Listing: WR01.cpp
* Description: Week in Review listing for week 1
*===============================================*/
#include <iostream>
using namespace std;
enum CHOICE {
DrawRect = 1,
GetArea,
GetPerim,
ChangeDimensions,
Quit };
// Rectangle class declaration
class Rectangle
{
public:
// constructors
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 << "\nInvalid Choice, try again. ";
cout << endl << endl;
continue;
}
switch (choice)
{
case DrawRect:
DoDrawRect(theRect);
break;
case GetArea:
DoGetArea(theRect);
break;
case GetPerim:
DoGetPerim(theRect);
break;
case ChangeDimensions:
int newLength, newWidth;
cout << "\nNew width: ";
cin >> newWidth;
cout << "New height: ";
cin >> newLength;
theRect.SetSize(newWidth, newLength);
DoDrawRect(theRect);
break;
case Quit:
fQuit = true;
cout << "\nExiting... " << endl << endl;
break;
default:
cout << "Error in choice!" << endl;
fQuit = true;
break;
} // end switch
} // end while
return 0;
} // end main
int DoMenu()
{
int choice;
cout << endl << endl; // create two new lines
cout << " *** Menu *** " << endl;
cout << "(1) Draw Rectangle" << endl;
cout << "(2) Area" << endl;
cout << "(3) Perimeter" << endl;
cout << "(4) Resize" << endl;
cout << "(5) Quit" << endl;
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 << endl;
}
}
void DoGetArea(Rectangle theRect)
{
cout << "Area: " << theRect.GetArea() << endl;
}
void DoGetPerim(Rectangle theRect)
{
cout << "Perimeter: " << theRect.GetPerim() << endl;
}
// ========== End of Listing ========== |
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bobohawke
Joined: 16 Jul 2006
Location: Seoul
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| Posted: Fri Jul 28, 2006 3:41 am Post subject: C++ |
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| Nothing wrong with it, i pasted it into my c++ compiler and it worked first time, are you sure your IDE is configured properly ? |
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Demophobe
Joined: 17 May 2004
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| Posted: Fri Jul 28, 2006 3:55 am Post subject: |
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It compiled for me as well. I didn't see it in the OP (I have now re-read it)...but try a different compiler.
Last edited by Demophobe on Fri Jul 28, 2006 3:57 am; edited 1 time in total |
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bobohawke
Joined: 16 Jul 2006
Location: Seoul
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| Posted: Fri Jul 28, 2006 3:56 am Post subject: C++ |
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| DEV C++ 4.9.9.2 |
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Demophobe
Joined: 17 May 2004
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| Posted: Fri Jul 28, 2006 4:06 am Post subject: |
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I haven't needed a compiler in a while, but the Comeau online test-drive compiled it correctly with 'strict C++' settings.
@ PT - Maybe upgrade to DEV C++ 4.9.9.2? bobohawke had no issues with an apparently never version of DEV C++. |
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bobohawke
Joined: 16 Jul 2006
Location: Seoul
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