//This program calculates the area of a circle.  It asks the user
//if he or she wishes to continue.  A loop that demonstrates the
//toupper function repeats until the user enters 'y' or 'Y',
//'n' or 'N'.

#include <iostream>
#include <<cctype>
#include <iomanip>

using namespace std;

int main()
{
    const float pi = 3.14159;
    float radius;
    char go;
    
    cout << "This program calculates the area of a circle.\n";
    cout << fixed << setprecision(2);
    do
    {
         cout << "Enter the circle's radius: ";
         cin >> radius;
         cout << "The area is " << (pi * (radius * radius));
         cout << endl;
         do
         {
              cout << "Calculate another? (Y or N) ";
              cin >> go;
         }  
         while (toupper(go) != 'Y' && toupper(go) != 'N');
    } 
    while (toupper(go) == 'Y');
    return 0;

Sephiroth_IRA fucked around with this message at 14:34 on Aug 24, 2011

class My_CImg;
class YourLibrary {
private:
  My_CImg *pCImg;
public:
  //whatever interfaces and such
};

#include <CImg.h>
class My_CImg : public CImg<unsigned char> {}

class MyLibrary {
public:
  //whatever interfaces and such the users use

  //this really should be made abstract, but if you don't
  //have a virtual function table it seems dumb to make one
  //just to prevent users from creating an unusable class
};
MyLibrary *MakeLibrary();
void DestroyLibrary(MyLibrary*);

class InternalMyLibrary : public MyLibrary {
  CImg<unsigned char> MyCImg;
};
MyLibrary *MakeLibrary() {return new InternalMyLibrary;}
void DestroyLibrary(MyLibrary *x) {delete (InternalMyLibrary*)x;}

roomforthetuna fucked around with this message at 17:33 on Aug 24, 2011

CRIP EATIN BREAD fucked around with this message at 21:52 on Aug 25, 2011

nielsm fucked around with this message at 03:33 on Aug 26, 2011