OK so I started to make a calculator program and was compiling while I was coding (that's why the code isn't complete), and it gave me these errors.
Qt Code: 
  1. error: invalid conversion from `int' to `const QObject*'
  2. error:   initializing argument 3 of `static bool QObject::connect(const QObject*, const char*, const QObject*, const char*, Qt::ConnectionType)'
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Here is my code.
Qt Code: 
  1. #include <QApplication>
  2. #include <QPushButton>
  3. #include <QLabel>
  4. #include <QSpinBox>
  5. #include <QLCDNumber>
  6.  
  7. int main(int argc, char *argv[])
  8. {
  9.     QApplication app(argc, argv);
  10.     QLabel *minus = new QLabel("-");
  11.     QPushButton *equal = new QPushButton("Execute");
  12.     QSpinBox *num1 = new QSpinBox;
  13.     QSpinBox *num2 = new QSpinBox;
  14.     QLCDNumber *show = new QLCDNumber(3);
  15.     int calc1, calc2;
  16.  
  17.     QObject::connect(num1, SIGNAL(valueChanged(int)), calc1, SLOT(setValue(int)));
  18.  
  19.     return app.exec();
  20. }
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