Program to swap two integers in C++
Programming
#include
#include
class swaping
{
int a;
public :
void getdata(void);
friend void swap(swaping &,swaping &);
void display(void);
};
void swaping :: getdata(void)
{
cout<<"\n\nEnter any Integer :-";
cin>>a;
}
void swap(swaping &o1,swaping &o2)
{
int temp;
temp = o1.a;
o1.a = o2.a;
o2.a = temp;
}
void swaping :: display(void)
{
cout<
}
void main()
{
clrscr();
swaping o1,o2;
cout<<"Before Swaping\n";
o1.getdata();
o2.getdata();
swap(o1,o2);
cout<<"\n\nAfter Swaping\n";
o1.display();
o2.display();
getch();
}
Program of Line clipping by Cohen
Sutherland in C++
#include
#include
#include
#include
FILE *fp;
class clipping
{
private:
int x;
int y;
int code[4];
public:
clipping();
void getxy(char p[5]);
void encode(int left,int right,int bottom,int top);
int getcode(int k);
float getx(void);
float gety(void);
friend int accept(clipping p1,clipping p2);
friend int reject(clipping p1,clipping p2);
friend void swap_points(clipping &p1,clipping &p2);
int point_inside(void);
void clipping::operator =(clipping p2);
void changex(int winy,float m);
void changey(int winx,float m);
};
clipping::clipping()
{
int i;
x = 0;
y = 0;
for(i=0;i<4 i="" span="">
code[i] = 0;
}
float clipping::getx(void)
{
return(x);
}
float clipping::gety(void)
{
return(y);
}
void clipping::getxy(char p[5])
{
cout << "\nEnter the coordinates of point " << p;
cout << "\nX :- ";
fscanf(fp,"%d",&x);
cout << "\nY :- ";
fscanf(fp,"%d",&y);
}
void clipping::encode(int left,int right,int bottom,int top)
{
if(x < left)
code[0] = 1;
else
code[0] = 0;
if (x > right)
code[1] = 1;
else
code[1] = 0;
if (y > bottom)
code[2] = 1;
else
code[2] = 0;
if (y < top)
code[3] = 1;
else
code[3] = 0;
}
int clipping::getcode(int k)
{
if (code[k] == 1)
return(1);
return(0);
}
int accept(clipping p1,clipping p2)
{
int k;
for(k=0;k<4 k="" span="">
if (p1.getcode(k) || p2.getcode(k))
return(0);
return(1);
}
int reject(clipping p1,clipping p2)
{
int k;
for(k=0;k<4 k="" span="">
if (p1.getcode(k) && p2.getcode(k))
return(1);
return(0);
}
int clipping::point_inside(void)
{
if (code[0] || code[1] || code[2] || code[3])
return(0);
return(1);
}
void clipping::operator =(clipping p2)
{
int i;
x = p2.x;
y = p2.y;
for (i=0;i<4 i="" span="">
code[i] = p2.code[i];
}
void swap_points(clipping &p1,clipping &p2)
{
clipping tmp;
tmp = p1;
p1 = p2;
p2 = tmp;
}
void clipping::changex(int winy,float m)
{
x = x + (winy - y) / m;
y = winy;
}
void clipping::changey(int winx,float m)
{
y = y + (winx - x) * m;
x = winx;
}
void main()
{
int driver = detect,mode;
initgraph(&driver,&mode,"c:\\tc\\bgi");
clipping p1,p2,tmp;
int left,top,right,bottom,done=0,draw=0;
float m;
fp = fopen("cohensut.in","r");
clearviewport();
p1.getxy("p1");
p2.getxy("p2");
left = getmaxx() / 2 - 50;
right = getmaxx() / 2 + 50;
bottom = getmaxy() / 2 + 50;
top = getmaxy() / 2 - 50;
clearviewport();
rectangle(left,top,right,bottom);
line(p1.getx(),p1.gety(),p2.getx(),p2.gety());
while(done == 0)
{
p1.encode(left,right,bottom,top);
p2.encode(left,right,bottom,top);
if (accept(p1,p2))
{
done = 1;
draw = 1;
}
elseif (reject(p1,p2))
{
done = 1;
}
else
{
if (p1.point_inside())
swap_points(p1,p2);
m = (p2.gety() - p1.gety()) / (p2.getx() - p1.getx());
if(p1.getcode(0))
p1.changey(left,m);
elseif(p1.getcode(1))
p1.changey(right,m);
elseif (p1.getcode(2))
p1.changex(bottom,m);
elseif (p1.getcode(3))
p1.changex(top,m);
}
cout << "\nPress any key to continue...\n";
getch();
clearviewport();
rectangle(left,top,right,bottom);
line(p1.getx(),p1.gety(),p2.getx(),p2.gety());
}
if (draw)
{
rectangle(left,top,right,bottom);
line(p1.getx(),p1.gety(),p2.getx(),p2.gety());
}
getch();
}
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