返回一个错误信息串的指针

[c]代码库

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

#define NONSENSE -50 

int main(void) 
{ 
   /* FORCE AN ERROR TO OCCUR */ 
   int gdriver = NONSENSE, gmode, errorcode; 

   /* initialize graphics mode */ 
   initgraph(&gdriver, &gmode, ""); 

   /* read result of initialization */ 
   errorcode = graphresult(); 

   /* if an error occurred, then output a */ 
   /* descriptive error message.          */ 
   if (errorcode != grOk) 
   { 
      printf("Graphics error: %s\n", grapherrormsg(errorcode)); 
      printf("Press any key to halt:"); 
      getch(); 
      exit(1); /* terminate with an error code */ 
   } 

   /* draw a line */ 
   line(0, 0, getmaxx(), getmaxy()); 

   /* clean up */ 
   getch(); 
   closegraph(); 
   return 0; 
}