[求助]这是我的程序,为什么后面老报错哦!
/* file: draw a box */
# include <stdio.h>
# include <graphics.h>
# include <genlib.h>
/* constants */
#define h 0.5
#define w 1.0
/* function prototypes */
void drawcrossbox( double x,double y,double width, double height);
/* main program */
main()
{
initgraphics();
drawcrossbox( 0.5,0.5,w,h);
getch();
}
void drawcrossbox( double x,double y,double width,double height)
{
MovePen(x,y);
DrawLine(0,height);
DrawLine(width,0);
DrawLine(0,-height);
DrawLine(-width,0);
}
未定义的符号 '_DrawLine' 在模块 111.txt
未定义的符号 '_MovePen' 在模块 111.txt
未定义的符号 '_initgraphics' 在模块 111.txt
