Update todes.c

ch15/todes.c

@@ -7,7 +7,7 @@ int main()
     int fd = open("data.dat", O_WRONLY | O_CREAT | O_TRUNC);
     if (fd == -1)
     {
-        fputs("file open error");
+        fputs("file open error",stdout);
         return -1;
     }
 
@@ -17,4 +17,4 @@ int main()
     printf("Second file descriptor: %d \n", fileno(fp)); //转回文件描述符
     fclose(fp);
     return 0;
-}
+}