Line using slope intercept method

#include"stdio.h"
#include"conio.h"
#include"graphics.h"
void main()
{
int i=DETECT,M,color=1;
int x1,y1,x2,y2,dx,dy,xend,m,b,x,y;
clrscr();
initgraph(&i,&M,"");
printf("Enter the values of x1,y1,x2,y2");
scanf("%d%d%d%d",&x1,&y1,&x2,&y2);
dx=x2-x1;
dy=y2-y1;
m=dy/dx;
b=y1-m*x1;
if(dx<0)
{
x=x2;
y=y2;
xend=x1;
}
else
{
x=x1;
y=y1;
xend=x2;
}
for(i=x;i
{
putpixel(i,y,color);
i=i+1;
y=m*i+b;
color++;
}
getch();
}