error:invalid use of member

[quickNitin]

following errors i am getting on execution. Related part of code i am presenting.

g++ -c -pipe -g -Wall -W -D_REENTRANT -DQT_GUI_LIB -DQT_NETWORK_LIB -DQT_CORE_LIB -DQT_SHARED -I/usr/local/Trolltech/Qt-4.1.2/mkspecs/linux-g++ -I. -I/usr/local/Trolltech/Qt-4.1.2/include/QtCore -I/usr/local/Trolltech/Qt-4.1.2/include/QtNetwork -I/usr/local/Trolltech/Qt-4.1.2/include/QtGui -I/usr/local/Trolltech/Qt-4.1.2/include -I. -I. -o client.o client.cpp
client.cpp: In member function ‘void Client::calculating()’:
client.cpp:112: error: invalid use of member (did you forget the ‘&’ ?)
client.cpp:113: error: invalid use of member (did you forget the ‘&’ ?)
client.cpp:125: error: invalid use of member (did you forget the ‘&’ ?)
client.cpp:128: error: no matching function for call to ‘Client::startSending(<unknown type>, <unknown type>)’
client.h:53: note: candidates are: void Client::startSending(int, int)
client.cpp:129: error: invalid use of member (did you forget the ‘&’ ?)
client.cpp:137: error: invalid use of member (did you forget the ‘&’ ?)
client.cpp:142: error: invalid use of member (did you forget the ‘&’ ?)
make: *** [client.o] Error 1

swap is not a member of class.

void swap(int *a,int *b)
 {
	int *t;
	*t = *a;
	*a = *b;
	*b = *t;
 
 }
int x,y,x1=0, y10=0 ,x2=100,y2=100,e,dy,dx,absolute; //declared at global scope, not member of class
 
void Client::calculating()
{
 
	if(x1>x2)
	{
		swap(&x1,&x2);
		swap(&y10,&y2);
	}
	x = x1;
	y = y10;
 
	if((y2-y10)<0)
	absolute = -1;
	else
	absolute = 1;
 
	dy = absolute*(y2-y10);
	dx = x2-x1;
 
	//usleep(1000*1000*1);
	e = (2*dy)-dx;
	while( x < x2)
	{
 
		emit startSending(x,y);
		x = x+1;
 
		if(e<0)
		e = e+(2*dy);
 
		else
		if (y10>y2)
		{
		y = y-1;
		e = e+(2*dy)-(2*dx);
		}
		else
		{
		y = y+1;
		e = e+(2*dy)-(2*dx);
		}
 
 
	}
 
 
 
}

void swap(int *a,int *b)
 {
	int *t;
	*t = *a;
	*a = *b;
	*b = *t;

 }
int x,y,x1=0, y10=0 ,x2=100,y2=100,e,dy,dx,absolute; //declared at global scope, not member of class

void Client::calculating()
{

	if(x1>x2)
	{
		swap(&x1,&x2);
		swap(&y10,&y2);
	}
	x = x1;
	y = y10;

	if((y2-y10)<0)
	absolute = -1;
	else
	absolute = 1;

	dy = absolute*(y2-y10);
	dx = x2-x1;

	//usleep(1000*1000*1);
	e = (2*dy)-dx;
	while( x < x2)
	{
		
		emit startSending(x,y);
		x = x+1;

		if(e<0)
		e = e+(2*dy);

		else
		if (y10>y2)
		{
		y = y-1;
		e = e+(2*dy)-(2*dx);
		}
		else
		{
		y = y+1;
		e = e+(2*dy)-(2*dx);
		}
		
	
	}



}

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