函数名: outtext 
 功  能: 在视区显示一个字符串 
 用  法: #include <graphics.h> 
         void far outtext(char far *textstring); 
 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; 
   /* 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; 
   /* move the C.P. to the center of the screen */ 
    moveto(midx, midy); 
   /* output text starting at the C.P. */ 
    outtext("This "); 
    outtext("is "); 
    outtext("a "); 
    outtext("test."); 
   /* clean up */ 
    getch(); 
    closegraph(); 
    return 0; 
 }