Black Jack

I can't figure out why i get this error:

In function âuserinputâ:
error: too few arguments to function â_IO_getcâ

Code:

#include <stdio.h>
#include <stdlib.h>
#include <time.h>

#define COMPUTER  0
#define HUMAN    1
#define NOBODY    -1

#define WIN 1
#define DRAW  0
#define LOSE  -1
#define OK  2
#define BLACKJACK 3
#define BUST  4

#define MAX_SIZE 52

#define TRUE  1
#define FALSE 0

int askmrpoker(int,int);
int cardvalue(int);
void init(void);
void swap(void);
void drawcard(int);
void takecard(int);
void userinput(void);

char *s[] = {"A","2","3","4","5","6","7","8","9","10","J","Q","K"};

struct cd
{
  int num;
  int pat;
};

struct cd card[MAX_SIZE];
int who[MAX_SIZE];
int maxcard;

void takecard(int w)
{
  who[maxcard]=w;
  maxcard++;
}

void init()
{
  int i;
  maxcard = 0;
  for(i=0; i<MAX_SIZE; i++)
  {
    card[i].num = i/4 ; /*0 to 12*/
    card[i].pat = i%4 +3 ; /*3 to 6*/
    who[i] = NOBODY;
  }
}

void swap()
{
  int i, j, k;
  struct cd tmp;
  for(i=0; i<MAX_SIZE; i++)
  {
    j = rand()%MAX_SIZE;
    k = rand()%MAX_SIZE;
    tmp = card[j];
    card[j] = card[k];
    card[k] = tmp;
  }
}

void drawcard(int hide)
{
  int i,hpos,cpos;
  hpos = cpos =0;
  for(i=0; i<maxcard; i++)
  {
    if(who[i] == HUMAN)
    {
      printf("%s\n",s[card[i].num]);
      printf("%c\n",card[i].pat);
      hpos++;
    }
    else
    {
      if(hide == TRUE)
      {
    printf("**\n");
    printf("**\n");
      }
      else
      {
    printf("%s\n",s[card[i].num]);
    printf("%c\n",card[i].pat);
      }
      cpos++;
    }
  }
  printf("Computer Side\n");
  printf("Human Side\n");
  printf("Number of cards :%d\n",maxcard);
  printf("Human Hand : %d\n",cardvalue(HUMAN));
  printf("Computer Hand : %d\n",(hide==TRUE?0:cardvalue(COMPUTER)));
  printf("H for Hit, S for stand, ESC for exit\n");
}

int cardvalue(int w)
{
  int i,k,l,aflag,num;
  k= num = aflag =0;

  for(i=0; i<maxcard; i++)
  {
    if(who[i] == w)
    {
      k=card[i].num +1;
      if(k>=2 && k<=10) /*2~10*/
    num = num+k;
      else
    if(k>=10)
      num = num+10;
    else
      aflag++;
    }
  }
  for(l=0; l<aflag; l++)
  {
    if(num <= 10)
      num = num+11;
    else
      num++;
  }
  return num;
}

int askmrpoker(int w, int o)
{
  if( cardvalue(w) == 21)
    return BLACKJACK;
  if( cardvalue(w) >21 )
    return BUST;
  if( cardvalue(w) > cardvalue(o))
    return WIN;
  if( cardvalue(w) == cardvalue(o))
    return DRAW;
  if( cardvalue(w) < cardvalue(o))
    return LOSE;
  return OK;
}

void userinput()
{
  int ch;
  while(TRUE)
  {
    ch = (int)getc();
    switch(ch)
    {
      case 27:/*ESC*/
    break;
      case 104:/*H for hit*/
    takecard(HUMAN);
    drawcard(TRUE);
    break;
      case 115:/*S for stand*/
    return;
    }
    if(cardvalue(HUMAN) >= 21)
      return;
  }
}

main()
{
  int i;
  int start = TRUE;
  srand(time(NULL));
  rand();
  do
  {
    if(start == TRUE)
    {
      init();
      swap();
      takecard(HUMAN);takecard(HUMAN);
      takecard(COMPUTER);takecard(COMPUTER);
      start = FALSE;
    }
    drawcard(TRUE);
    userinput();
    switch(askmrpoker(HUMAN, COMPUTER))
    {
      case BLACKJACK:
    drawcard(FALSE);
    start  = TRUE;
    printf("You Got BlackJack!  \n");
    system("pause");
      break;

      case BUST:
    drawcard(FALSE);
    start  = TRUE;
    printf("Loser !  \n");
    system("pause");
      break;
    }

    if(start == FALSE)
    {
      while( askmrpoker(COMPUTER,HUMAN) == LOSE )
      {
    takecard(COMPUTER);
    drawcard(FALSE);
      }
      switch(askmrpoker(COMPUTER,HUMAN))
      {
    case BLACKJACK:
      drawcard(FALSE);
      start=TRUE;
      printf("Pizza Cake! I got BlackJack!  \n");
      system("pause");
      break;
    case BUST:
      drawcard(FALSE);
      start=TRUE;
      printf("@#$% I got bust!  \n");
      system("pause");
      break;
    case WIN:
      drawcard(FALSE);
      start=TRUE;
      printf("Pizza Cake! I win  \n");
      system("pause");
      break;
    case DRAW:
      drawcard(FALSE);
      start=TRUE;
      printf("A boring game.  \n");
      system("pause");
      break;
    case LOSE:
      drawcard(FALSE);
      start=TRUE;
      printf("@#$% I lose!  \n");
      system("pause");
      }
    }
  }
  while(TRUE);
}

Any suggestions

getc() requires a FILE object. Instead, use getchar()