Issue with QObject::connect

[fish_sticks]

I'm trying to call a user-defined function while clicking a button.Here's my code and the error I'm getting

Here's my .h file

#include <QApplication>
#include <QPushButton>
#include <QGridLayout>
#include <QLCDNumber>
#include <QString>
#include <iostream>
#include <test.h>
 
int i;
QString str = "0";
int calc::appendone()
{
	i = 1;
	str.append("1");
	return 0;
}
int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	QWidget *window = new QWidget;
	QPushButton *one = new QPushButton("1");
	QPushButton *two = new QPushButton("2");
	QPushButton *three = new QPushButton("3");
	QPushButton *four = new QPushButton("4");
	QPushButton *five = new QPushButton("5");
	QPushButton *six = new QPushButton("6");
	QPushButton *seven = new QPushButton("7");
	QPushButton *eight = new QPushButton("8");
	QPushButton *nine = new QPushButton("9");
	QPushButton *zero = new QPushButton("0");
	QPushButton *add = new QPushButton("+");
	QPushButton *sub = new QPushButton("-");
	QPushButton *mul = new QPushButton("*");
	QPushButton *div = new QPushButton("/");
	QPushButton *equ = new QPushButton("=");
	QLCDNumber *lcd = new QLCDNumber(5);
	QObject::connect(one, SIGNAL(clicked()), &calc, SLOT(appendone()));
	std::cout<<i;
	if(i == 1)
	{
		str.append("1");
		lcd->display(str);
	}
	QGridLayout *layout = new QGridLayout;
	lcd->display(str);
	layout->addWidget(zero,5,1);
	layout->addWidget(equ,5,3);
	layout->addWidget(one,4, 2);
	layout->addWidget(two,4,1);
	layout->addWidget(three,4,0);
	layout->addWidget(add,4,3);
	layout->addWidget(sub,4,4);	
	layout->addWidget(four,3,2);
	layout->addWidget(five,3,1);
	layout->addWidget(six,3,0);
	layout->addWidget(mul,5,3);
	layout->addWidget(div,5,4);
	layout->addWidget(seven,2,2);
	layout->addWidget(eight,2,1);
	layout->addWidget(nine,2,0);
	layout->addWidget(lcd,2,3);
	window->setLayout(layout);
	window->show();
	return app.exec();
}

#include <QApplication>
#include <QPushButton>
#include <QGridLayout>
#include <QLCDNumber>
#include <QString>
#include <iostream>
#include <test.h>

int i;
QString str = "0";
int calc::appendone()
{
	i = 1;
	str.append("1");
	return 0;
}
int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	QWidget *window = new QWidget;
	QPushButton *one = new QPushButton("1");
	QPushButton *two = new QPushButton("2");
	QPushButton *three = new QPushButton("3");
	QPushButton *four = new QPushButton("4");
	QPushButton *five = new QPushButton("5");
	QPushButton *six = new QPushButton("6");
	QPushButton *seven = new QPushButton("7");
	QPushButton *eight = new QPushButton("8");
	QPushButton *nine = new QPushButton("9");
	QPushButton *zero = new QPushButton("0");
	QPushButton *add = new QPushButton("+");
	QPushButton *sub = new QPushButton("-");
	QPushButton *mul = new QPushButton("*");
	QPushButton *div = new QPushButton("/");
	QPushButton *equ = new QPushButton("=");
	QLCDNumber *lcd = new QLCDNumber(5);
	QObject::connect(one, SIGNAL(clicked()), &calc, SLOT(appendone()));
	std::cout<<i;
	if(i == 1)
	{
		str.append("1");
		lcd->display(str);
	}
	QGridLayout *layout = new QGridLayout;
	lcd->display(str);
	layout->addWidget(zero,5,1);
	layout->addWidget(equ,5,3);
	layout->addWidget(one,4, 2);
	layout->addWidget(two,4,1);
	layout->addWidget(three,4,0);
	layout->addWidget(add,4,3);
	layout->addWidget(sub,4,4);	
	layout->addWidget(four,3,2);
	layout->addWidget(five,3,1);
	layout->addWidget(six,3,0);
	layout->addWidget(mul,5,3);
	layout->addWidget(div,5,4);
	layout->addWidget(seven,2,2);
	layout->addWidget(eight,2,1);
	layout->addWidget(nine,2,0);
	layout->addWidget(lcd,2,3);
	window->setLayout(layout);
	window->show();
	return app.exec();
}

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My .CPP file

#include <QApplication>
#include <QPushButton>
#include <QGridLayout>
#include <QLCDNumber>
#include <QString>
#include <iostream>
#include <test.h>
 
int i;
QString str = "0";
int calc::appendone()
{
	i = 1;
	str.append("1");
	return 0;
}
int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	QWidget *window = new QWidget;
	QPushButton *one = new QPushButton("1");
	QPushButton *two = new QPushButton("2");
	QPushButton *three = new QPushButton("3");
	QPushButton *four = new QPushButton("4");
	QPushButton *five = new QPushButton("5");
	QPushButton *six = new QPushButton("6");
	QPushButton *seven = new QPushButton("7");
	QPushButton *eight = new QPushButton("8");
	QPushButton *nine = new QPushButton("9");
	QPushButton *zero = new QPushButton("0");
	QPushButton *add = new QPushButton("+");
	QPushButton *sub = new QPushButton("-");
	QPushButton *mul = new QPushButton("*");
	QPushButton *div = new QPushButton("/");
	QPushButton *equ = new QPushButton("=");
	QLCDNumber *lcd = new QLCDNumber(5);
	QObject::connect(one, SIGNAL(clicked()), &calc, SLOT(appendone())); //line 37
	std::cout<<i;
	if(i == 1)
	{
		str.append("1");
		lcd->display(str);
	}
	QGridLayout *layout = new QGridLayout;
	lcd->display(str);
	layout->addWidget(zero,5,1);
	layout->addWidget(equ,5,3);
	layout->addWidget(one,4, 2);
	layout->addWidget(two,4,1);
	layout->addWidget(three,4,0);
	layout->addWidget(add,4,3);
	layout->addWidget(sub,4,4);	
	layout->addWidget(four,3,2);
	layout->addWidget(five,3,1);
	layout->addWidget(six,3,0);
	layout->addWidget(mul,5,3);
	layout->addWidget(div,5,4);
	layout->addWidget(seven,2,2);
	layout->addWidget(eight,2,1);
	layout->addWidget(nine,2,0);
	layout->addWidget(lcd,2,3);
	window->setLayout(layout);
	window->show();
	return app.exec();
}

#include <QApplication>
#include <QPushButton>
#include <QGridLayout>
#include <QLCDNumber>
#include <QString>
#include <iostream>
#include <test.h>

int i;
QString str = "0";
int calc::appendone()
{
	i = 1;
	str.append("1");
	return 0;
}
int main(int argc, char *argv[])
{
	QApplication app(argc, argv);
	QWidget *window = new QWidget;
	QPushButton *one = new QPushButton("1");
	QPushButton *two = new QPushButton("2");
	QPushButton *three = new QPushButton("3");
	QPushButton *four = new QPushButton("4");
	QPushButton *five = new QPushButton("5");
	QPushButton *six = new QPushButton("6");
	QPushButton *seven = new QPushButton("7");
	QPushButton *eight = new QPushButton("8");
	QPushButton *nine = new QPushButton("9");
	QPushButton *zero = new QPushButton("0");
	QPushButton *add = new QPushButton("+");
	QPushButton *sub = new QPushButton("-");
	QPushButton *mul = new QPushButton("*");
	QPushButton *div = new QPushButton("/");
	QPushButton *equ = new QPushButton("=");
	QLCDNumber *lcd = new QLCDNumber(5);
	QObject::connect(one, SIGNAL(clicked()), &calc, SLOT(appendone())); //line 37
	std::cout<<i;
	if(i == 1)
	{
		str.append("1");
		lcd->display(str);
	}
	QGridLayout *layout = new QGridLayout;
	lcd->display(str);
	layout->addWidget(zero,5,1);
	layout->addWidget(equ,5,3);
	layout->addWidget(one,4, 2);
	layout->addWidget(two,4,1);
	layout->addWidget(three,4,0);
	layout->addWidget(add,4,3);
	layout->addWidget(sub,4,4);	
	layout->addWidget(four,3,2);
	layout->addWidget(five,3,1);
	layout->addWidget(six,3,0);
	layout->addWidget(mul,5,3);
	layout->addWidget(div,5,4);
	layout->addWidget(seven,2,2);
	layout->addWidget(eight,2,1);
	layout->addWidget(nine,2,0);
	layout->addWidget(lcd,2,3);
	window->setLayout(layout);
	window->show();
	return app.exec();
}

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Here's the error I'm getting

test.cpp: In function ‘int main(int, char**)’:
test.cpp:37:45: error: expected primary-expression before ‘,’ token

test.cpp: In function ‘int main(int, char**)’:
test.cpp:37:45: error: expected primary-expression before ‘,’ token

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Thanks in advance