C语言中如何编写图形界面

最关键是要头文件 "graphics.h"
#include<graphics.h>/*打印一个SINX曲线*/
#include<math.h>
void main()
{
int driver,mode,x,y1,y2,i,j,n;
driver=DETECT;
mode=0;
initgraph(&driver,&mode,"");/*初使化必须有*/
setcolor(RED);
for(x=-300;x<=500;x++)
{
if(x%2==0)
{ i=x;
y1=(int)80*sin(0.05*x)+100;
putpixel(i,y1,YELLOW);
}
else{j=x;
y2=(int)80*sin(0.05*x)+100;
putpixel(j,y2,RED);
lineto(i,y1);
}
}
line(0,100,1000,100);
line(0,0,0,1000);
getch();
closegraph();/*关闭*/
}