polygon program for graphics

#include
#include
#include
#include
#include
void line(int xa,int ya,int xb,int yb)
{
int dx,dy,s,k;
float xi,yi,x,y;
int gd=DETECT,gm;
initgraph(&gd,&gm, "");
dx=xb-xa;
dy=yb-ya;
if(abs(dx)>abs(dy))
s=abs(dx);
else
s=abs(dy);
xi=dx/s;
yi=dy/s;
x=xa;
y=ya;
putpixel(ceil(x),ceil(y),1);
for(k=0;k{
x=x+xi;
y=y+yi;
putpixel(ceil(x),ceil(y),1);
}
}

void main()
{
int v[10][2];
int x,y,n,i,x1,y1,x2,y2;
printf("ENTER THE NO OF EDGES");
scanf("%d",&n);
printf("ENTER THE VERTICES");
for(i=0;i{
scanf("%d",&v[i][0]);
scanf("%d",&v[i][1]);
}
for(i=0;i{ if(i!=n-1)
{
x1=v[i][0];
y1=v[i][1];
x2=v[i+1][0];
y2=v[i+1][1];
}
else
{
x1=v[i][0];
y1=v[i][1];
x2=v[0][0];
y2=v[0][1];
}
line(x1,y1,x2,y2);
}
getch();
}