用DDR法画直线
可是用C++编译器确出现错误．请教该怎么做啊
#include "stdio.h"
#include "graphics.h"
void DDALine(int x0,int y0,int x1,int y1,int color)
{ int x;
float dx,dy,y,k;
dx=x1-x0;
dy=y1-y0;
k=dy/dx;
y=y0;
for(x=x0;x<=x1;x++)
{
putpixel(x,(int)(y+0.5),color);
y=y+k;
}
}
void main()
{
int gdriver=DETECT,gmode=0,a,b,c,d,e;
registerbgidriver(EGAVGA_driver);
initgraph(&gdriver,&gmode,"");
scanf("%d%d%d%d%d",&a,&b,&c,&d,&e);
DDALine(a,b,c,d,e);
getch();
}