功 能: 返回屏幕的最大x坐标

用 法: int far getmaxx(void);

编译环境: TC/WINTC

程序例:

#include <stdio.h>#include <conio.h>

#include <graphics.h>

int main(void)

{

/* request auto detection */

int gdriver,gmode,errorcode;

int midx,midy;

char xrange[80],yrange[80];

/* initialize graphics and local variables */

gdriver=DETECT;

initgraph(&gdriver,&gmode,"");

/* read result of initialization */

errorcode=graphresult();

/* an error occurred */

if(errorcode!=grOk)

{

printf("Graphics error: %s\",grapherrormsg(errorcode));

getch();

exit(1); /* terminate with an error code */

}

midx=getmaxx()/2;

midy=getmaxy()/2;

/* convert max resolution values into strings */

sprintf(xrange,"X values range from 0..%d",getmaxx());

sprintf(yrange,"Y values range from 0..%d",getmaxy());

/* display the information */

settextjustify(CENTER_TEXT,CENTER_TEXT);

outtextxy(midx,midy,xrange);outtextxy(midx,midy+textheight("W"),yrange);

/* clean upp */

getch();

closegraph();

return 0;

}