功 能: 返回屏幕的最大y坐标

用 法: int far getmaxy(void);

程序例:#include <graphics.h>

#include <stdlib.h>

#include <stdio.h>

#include <conio.h>

int main(void)

{

/* request auto detection */

int gdriver = DETECT, gmode, errorcode;

int midx, midy;

char xrange[80], yrange[80];

/* initialize graphics and local variables */

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

/* read result of initialization */

errorcode = graphresult();

if (errorcode != grOk) /* an error occurred */

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

printf("Press any key to halt:");

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 up */

getch();

closegraph();

return 0;

}