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Code: Alles auswählen

#include<QWidget>

class LCD;
class QLCDNumber;

class ErgebnisLCD:public QWidget
{
      Q_OBJECT

   private:
      QLCDNumber*lcd3;
      int value;
      LCD*lcd1;
      LCD*lcd2;
      
   public:
      ErgebnisLCD(LCD* lcd1,LCD* lcd2,QWidget* parent=0);
      //expected ) before '*' token
   
   public slots:
      void calculate();
      void showValue();
};

Code: Alles auswählen

//ErgebnisLCD.h
#define ErgebnisLCD

#include<QWidget>

class LCD;
class QLCDNumber;

class ErgebnisLCD:public QWidget
{/*<----- an anonymous union cannot have function members */
      Q_OBJECT

   private:
      QLCDNumber* lcd3;
      int value;
      LCD*lcd1;
      LCD*lcd2;
      
   public:
	ErgebnisLCD(LCD* lcd1,LCD* lcd2,QWidget* parent=0);/*<-----
        expected `)' before '*' token*/ 
        
   public slots:
      void calculate();
      void showValue();
};/*<---- abstract declarator `<anonymous class>' used as declaration 
               namespace-scope anonymous aggregates must be static */
#endif

Code: Alles auswählen

//main.cpp
#include"ErgebnisLCD.h"
#include<QApplication>
#include<QWidget>
#include<QGridLayout>

class MyWindow:public QWidget
{
   public:
   	MyWindow(QWidget*parent=0)
      	:QWidget(parent)
   	{
   		LCD*lcd1=new LCD;
      	LCD*lcd2=new LCD;
        ErgebnisLCD* lcd3=new ErgebnisLCD(lcd1,lcd2);/*<------
        `lcd3' undeclared (first use this function)
         expected identifier before ';' token  */
      
      	QGridLayout*grid=new QGridLayout;
			grid->addWidget(lcd1,0,0);
			grid->addWidget(lcd2,0,1);
         grid->addWidget(lcd3,0,2);
      
      	setLayout(grid);
   	}
};

   
int main(int argc,char* argv[])
{
   QApplication app(argc,argv);

	MyWindow window;
   window.show();
   
   return app.exec();
}