error: ‘paymentFrm’ was not declared in this scope

[tttr]

I'm a neophyte.
code
main,cpp

#include <qapplication.h>
#include "paymentfrm.h"
int main( int argc, char ** argv )
{
    QApplication a( argc, argv );
    paymentFrm w;
    w.show();
    a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
    return a.exec();
}

#include <qapplication.h>
#include "paymentfrm.h"
int main( int argc, char ** argv )
{
    QApplication a( argc, argv );
    paymentFrm w;
    w.show();
    a.connect( &a, SIGNAL( lastWindowClosed() ), &a, SLOT( quit() ) );
    return a.exec();
}

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paymentfrm.ui.h

#include <qsqldatabase.h> 
#include<qsqlquery.h>
#include <qstring.h> 
void paymentFrm::setDiscount_2()
{
 
    QsqlDatabase *DB=QSqlDatabase::addDatabase("QMYSQL3");
    if(!DB){
	qWarning("Failed to connect to driver");
	return;
    }
    DB->setDatabaseName("BookStore");
    DB->setUserName("root");
    DB->setPassword("9");
    DB->setHostName("localhost");
    if(!DB->open()){
	qWarning("Failed to open TraniHelper database:"+DB->lastError().driverText());
	qWarning(DB->lastError().databaseText());
	return;
    }
 
    QSqlQuery query;
    query.exec("select Levels from Customer where id="+VIPID_2.text());
    query.next();
    int level=query.value(0);
    QString levels;
    levels=levels.setNum(level);
    query.exec("select Discount from Discount where Levels="+levels);
    QString discount;
    discount=discount.setNum(query.value(0));
    Discount_2.setText(discount);
 
}
 
 
void paymentFrm::setTable()
{
 
    QsqlDatabase *DB=QSqlDatabase::addDatabase("QMYSQL3");
    if(!DB){
	qWarning("Failed to connect to driver");
	return;
    }
    DB->setDatabaseName("BookStore");
    DB->setUserName("root");
    DB->setPassword("9");
    DB->setHostName("localhost");
    if(!DB->open()){
	qWarning("Failed to open TraniHelper database:"+DB->lastError().driverText());
	qWarning(DB->lastError().databaseText());
	return;
    }
    QSqlQuery query;
    query.exec("select * from Book where ISBN="+ISBN_2.text());
    query.next();
    int i=Table.numRows();
    Table.insertRows(i,1);
 
 
    Table.setText(i,0,query.value(1)); 
    Table.setText(i,1,query.value(2));
    Table.setText(i,2,query.value(6));
    Table.setText(i,3,Number_2.text());
    Table.setText(i,4,Discount_2.text());
 
    float num=Number_2.text().toFloat();
    float discount=Discount_2.text().toFloat();
    float total=num*discount*query.value(6);
    QString Total;
    Total=Total.setNum(total);
    Table.setText(i,5,Total);
}

#include <qsqldatabase.h> 
#include<qsqlquery.h>
#include <qstring.h> 
void paymentFrm::setDiscount_2()
{
    
    QsqlDatabase *DB=QSqlDatabase::addDatabase("QMYSQL3");
    if(!DB){
	qWarning("Failed to connect to driver");
	return;
    }
    DB->setDatabaseName("BookStore");
    DB->setUserName("root");
    DB->setPassword("9");
    DB->setHostName("localhost");
    if(!DB->open()){
	qWarning("Failed to open TraniHelper database:"+DB->lastError().driverText());
	qWarning(DB->lastError().databaseText());
	return;
    }
    
    QSqlQuery query;
    query.exec("select Levels from Customer where id="+VIPID_2.text());
    query.next();
    int level=query.value(0);
    QString levels;
    levels=levels.setNum(level);
    query.exec("select Discount from Discount where Levels="+levels);
    QString discount;
    discount=discount.setNum(query.value(0));
    Discount_2.setText(discount);

}


void paymentFrm::setTable()
{
    
    QsqlDatabase *DB=QSqlDatabase::addDatabase("QMYSQL3");
    if(!DB){
	qWarning("Failed to connect to driver");
	return;
    }
    DB->setDatabaseName("BookStore");
    DB->setUserName("root");
    DB->setPassword("9");
    DB->setHostName("localhost");
    if(!DB->open()){
	qWarning("Failed to open TraniHelper database:"+DB->lastError().driverText());
	qWarning(DB->lastError().databaseText());
	return;
    }
    QSqlQuery query;
    query.exec("select * from Book where ISBN="+ISBN_2.text());
    query.next();
    int i=Table.numRows();
    Table.insertRows(i,1);
    
    
    Table.setText(i,0,query.value(1)); 
    Table.setText(i,1,query.value(2));
    Table.setText(i,2,query.value(6));
    Table.setText(i,3,Number_2.text());
    Table.setText(i,4,Discount_2.text());
    
    float num=Number_2.text().toFloat();
    float discount=Discount_2.text().toFloat();
    float total=num*discount*query.value(6);
    QString Total;
    Total=Total.setNum(total);
    Table.setText(i,5,Total);
}

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main.cpp: In function ‘int main(int, char**)’:
main.cpp:9: error: ‘paymentFrm’ was not declared in this scope
main.cpp:9: error: expected ‘;’ before ‘w’
main.cpp:10: error: ‘w’ was not declared in this scope

I don't know how to solve this problem.
Somebody please help me on this.
Thanks.