My code won't compile!

Hi everyone,

1. This is NOT my code - this was from someone off the internet
2. The reason why I decided to download this code was to analyse it;
seeing how people make simple C games
3. This code is BAD - it uses global variables, a lot of the variables
have meaningless letters
4. I've posted my question to comp.lang.c and got quite a lot of
feedback - they say that 'I' (meaning the code) contained "#include
clrscr()" in order for the error to occur - that wasn't in the code
5. This code is apparently specific to this lcc compiler; use of
tcconio.h; conio.h isn't standard, tcconio.h definitely isn't
6. From the majority of people, I conclude that I should look for a
better example of a C game; that is - that the author has carefully
thought out his function calls, parameters, arguments, variables and
structure.
7. SOMEONE just solve this problem - PLEASE!
8. This game is crap but that's what I expect (but of course not the
CODE to be CRAP AS WELL!)

And here's the code:

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

int x = 40, l, k = 2, z = 0, i, score = 0;
void gameover();
void game();
void top();
void shoot();
void gotoxy (int x, int y);

void main()
{
        int ch;
        clrscr();
        printf("\n\t\t\t\tSHOOTING IN C");
        printf("\n\t\t\t\t*************");
        printf("\n\n\n1.NEW GAME\n2.INSTRUCTIONS\n3.QUIT");
        printf("\n\n\n ENTER YOUR CHOICE:");
        scanf("%d", &ch);

        switch(ch)
        {
                case 1:
                        game();
                        break;
                case 2:
                        clrscr();
                        printf("\n\t\t1. Press any key to start the
game.");
                        printf("\n\t\t2. Use'n' for left and 'm' for
right directions.");
                        printf("\n\t\t3. Press ENTER key for
shooting");
                        printf("\n\t\t4. PRESS 'x' KEY for Exit");
                        printf("\n\n\n\t\t\t Don't Use any other
keys");
                        getch();
                        main();
                        break;

                case 3:
                        exit(1);
        }

}

void game()
{
        char n, c;
        int k, y = 24;
        clrscr();
        i = 0;
        n = (char)i;
        clrscr();
        gotoxy(12,25);
        cprintf("\nUSE 'n' or 'm' For Moving and then press Enter for
shoot");

        while(c!=120)
        {
                c = getch();

                switch(c)
                {
                        case 'n':
                                top();
                                gotoxy(x--, y);
                                shoot();
                                break;

                        case 'm':
                                top();
                                gotoxy(x++,y);
                                cprintf("  ");
                                shoot();
                }
                cprintf("%c ",n);
        }

}

void top()
{
        char n;
        l = 254;
        n = (char)l;
        randomize();

        gotoxy(rand()%75, k);
        cprintf("%c", n);

}

void shoot()
{
        int c,a;
        c = getch();

        if (c == 13)
        {
                cprintf("%c", 263);

                for (a = 0; a <= k; a++)
                {
                        gotoxy(x, a);
                        cprintf(" ");
                }

                score += 10;
                gotoxy(1, 1);
                cprintf("SCORE=%d", score);
                gameover();
        }

}

void gameover()
{
        int b;
        z = z + 1;

        if(z >= 3)
        {
                k++;
                z = 0;
        }

        if ( k> 20)
        {
                printf("\n\t\t\tGAME OVER");
                sleep(3);
                getch();
                exit(0);
        }
}

The compiler re****ts an error about the clrscr() function