C Graphics 2

#include
#include
#include
#include
void dda(float x1,float y1,float x2,float y2)
{
float dx,dy,x=x1,y=y1,m;
int i;
dx=x2-x1;
dy=y2-y1;
if(abs(dx)>=abs(dy))
m=abs(dx);
else m=abs(dy);
putpixel((int)x,(int)y,15);
for(i=1;i<=m;i++) { x=x+dx/m; y=y+dy/m; putpixel((int)x,(int)y,15); } } void bress(float x1,float y1,float x2,float y2) { int x,y,end,inc=0,p,dx=abs(x2-x1),dy=abs(y2-y1),c=0,current=0; if(dx>dy)
{
p=2*dy-dx;
if(x1y2)inc=-1;
}
else
{
x=x2;y=y2;end=x1;
if(y2y1)inc=-1;
}
while(x<=end) { putpixel(x,y,15); if(p<0) p=p+2*dy; else { y=y+inc;p=p+2*(dy-dx); } x++; if(current==0&&c==10) { current=1;c=-1; } if(current==1&&c==6) { current=0;c=-1; } c++; } } else { p=2*dx-dy; if(y1x2)inc=-1;
}
else
{
y=y2;x=x2;end=y1;
if(x2x1)inc=-1;
}
while(y<=end)
{
putpixel(x,y,15);

if(p<0)p=p+2*dx;
else
{
x=x+inc;p=p+2*(dx-dy);
}
y++;
if(current==0&&c==10)
{
current=1;c=-1;
}
if(current==1&&c==6)
{
current=0;c=-1;
}
c++;
}
}
}

void main()
{
float x1,x2,y1,y2;
int ch;
int gd=DETECT,gm=DETECT;
initgraph(&gd,&gm,"");
printf("Enter end points of line(x1,y1,x2,y2)");
scanf("%f%f%f%f",&x1,&y1,&x2,&y2);
printf("Choose Algorithm(1-DDA 2-BRESENHAM)");
scanf("%d",&ch);
if(ch==1)
dda(x1,y1,x2,y2);
if(ch==2)
bress(x1,y1,x2,y2);
getch();
closegraph();
}