运行之前也须自己设置好initgraph里面的图形驱动路径，如果是绝对路径的话，可以把前面的registerbgidriver(EGAVGA_driver);一句去掉，程序很简单，没什么好说的了。 #include<graphics.h> main(){int a,b,d,x0,y0,x1,y1,x,y; int driver=DETECT,mode; printf("Please input two point to draw the line between:\n"); printf("x0=");scanf("%d",&x0); printf("y0=");scanf("%d",&y0); printf("x1=");scanf("%d",&x1); printf("y1=");scanf("%d",&y1); a=y0-y1;b=x1-x0;d=2*a+b; registerbgidriver(EGAVGA_driver); initgraph(&driver,&mode,""); for(x=x0,y=y0;x<=x1;) {putpixel(x,y,14);  if(d>=0)  {x=x+1;   d=d+2*a;  }  else  {x=x+1;   y=y+1;   d=d+2*(a+b);  } } getch(); closegraph();}

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