maze game in C

Simple maze game using C... Here's what I want to do. ( I am using Dev-C++ compiler)
** game map should be loaded from a file (in the following code, map is generated runtime), and its format should be something like the following.
WWWWWWWWWWWWWWWW
W                                               W
W                                               W
W      $             $                        W
W        O                                    W
W        $                      M            W
W                                               W
W                    M                        W
W            M                          E    W
WWWWWWWWWWWWWWWW

W = wall
O = moving character
$ = money
E = exit
M = monsters (when game is started these monsters should be chasing the O character)
** keys A,S,W and Z are used to move the character O (in the following code only key the down movement (key S) is coded.
** username and score should be visible and when game ends this info should be saved to a file (may be top 5 scorers)


=====================================================
#include <iostream.h>
#include <stdio.h>
#include <windows.h>
#include <stdlib.h>
#include <conio.h>
#include <ctype.h>

char moveR;
char moveL;
char moveU;
char moveD;
char move;
int mx=1;
int my=1;
int i,j;
char direction;
const char up_key='w', down_key='s', left_key='a', right_key='d';
char keypress;
char matrix[100][100];
void gotoxy(short x, short y)
{
      HANDLE hConsoleOutput;
      COORD Cursor_an_Pos = {x,y};
      hConsoleOutput = GetStdHandle (STD_OUTPUT_HANDLE);
      SetConsoleCursorPosition(hConsoleOutput, Cursor_an_Pos);
}

void loadgrid()
{
      for (i=0; i<30; i++)
      {
            for (j=0; j<30; j++)
            {
                  matrix[i][j]= '.';
            }
      }
}

void printgrid()
{
      for (i=0; i<30; i++)
      {
            for (j=0; j<30; j++)
            {
                  printf("%c", matrix[i][j]);
            }
            printf("\n");
      }
}

int main()
{
loadgrid();
printgrid();

while (mx>0 && my>0)
{
      if (kbhit())
      {
            keypress=getch(); //keypress=(char)getchar()
            if ((keypress == right_key) || (keypress == left_key) ||
                  (keypress == up_key) || (keypress == down_key))
                  direction = keypress;
                  if (direction == 's')
                  {
                  gotoxy(mx,my);
                  printf(".");
                  my=my+1;
                  gotoxy(mx,my);
                  printf("O");
                  gotoxy(mx,my);
                  }
                  if (direction == 'w')
                  {
                  gotoxy(mx,my);
                  printf(".");
                  my=my-1;
                  gotoxy(mx,my);
                  printf("O");
                  gotoxy(mx,my);
                  }
                  if (direction == 'a')
                  {
                  gotoxy(mx,my);
                  printf(".");
                  mx=mx-1;
                  gotoxy(mx,my);
                  printf("O");
                  gotoxy(mx,my);
                  }
                  if (direction == 'd')
                  {
                  gotoxy(mx,my);
                  printf(".");
                  mx=mx+1;
                  gotoxy(mx,my);
                  printf("O");
                  gotoxy(mx,my);
                  }
                  direction = ' ';
      }
}

return 0;
}