返回屏幕的最大宽度

[c]代码库

#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\n", 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; 
}