自动进行硬件测试后进行图形初始化
     #include <graphics.h>
     int main()
     {
          int gdriver, gmode;
          detectgraph(&gdriver, &gmode);     /*自动测试硬件*/
          printf("the graphics driver is %d, mode is %d\n", gdriver,
                 gmode);       /*输出测试结果*/
          getch();
          initgraph(&gdriver, &gmode, "c:\\tc");
                               /* 根据测试结果初始化图形*/
          bar3d(10, 10, 130, 250, 20, 1);
          getch();
          closegraph();
          return 0;
      }
TC编译后显示 Unable to open include file 'GRAPHICS.h'  怎么回事啊？？