Tukukkk

This is my program for the Game of life, I created it by myself with no reference or peers review so i need some comments and reviews on it.
I created 3 mode:

A. User Mode:
The program asks the user to enter the coordinates (x,y) where live creatures are to be
placed on the board, until the user enters a negative coordinate.

B. Automatic Mode:
The program randomly populates the board with creatures, each cell having a 1 in 10
chance of containing a creature.

C. Hybrid Mode:
After having automatically populated the board, allow the user to modify it.

How can I improve this? And I'm also working on a function to detect "steady" state. If anyone have any idea please suggest. Thank you very much.

/**Conway's Game of Life**/

#include <stdio.h>

#include <stdlib.h>

#include <time.h>

#include <conio.h>



const int WIDTH = 67;

const int HEIGHT = 47;

const int TRUE = 1;

const int FALSE = 0;



void makingboundarylines (int board[HEIGHT][WIDTH])

{

    int cols, rows;

    for (cols =0; cols <WIDTH; cols++)

    {

        board[0][cols] = '_';

        board[HEIGHT -1][cols]= '_';

    }

    for (rows =1; rows <HEIGHT; rows++)

    {

        board[rows][0] = '|';

        board[rows][WIDTH -1] = '|';

    }

}

void fillarray(int board[HEIGHT][WIDTH])

{

    int i,j;

    for(i =1; i <HEIGHT-1; i++)

        for(j=1; j <WIDTH-1; j++)

            board[i][j] = ' ';

}

void fillarrayrandomly(int board[HEIGHT][WIDTH])

{

    int i, j, num;

    srand((unsigned)time(NULL));

    for(i =1; i <HEIGHT -1; i++)

        for(j=1; j <WIDTH -1;j++)

        { 

            num = rand()%11;

            if (num == 1)

                board[i][j] = 'O';

            else board[i][j] = ' ';

        }

}

void display2Darray(int board[HEIGHT][WIDTH])

{

int rows;

int cols;

    for (rows = 0; rows <HEIGHT; rows++)

    {

        for(cols =0; cols <WIDTH; cols++)

            printf ("%3c", board[rows][cols]);

        printf ("n");

    }

}

void countneighbors (int board[HEIGHT][WIDTH])

{

    int neighbors;

    int rows;

    int cols;

    int a, b;

    for (rows =1; rows <HEIGHT; rows++)

    {

        for (cols = 1; cols <WIDTH; cols ++)

        {

            neighbors = 0;

            if (board[rows][cols] == 'O')

            {

                for (a = -1; a <2; a++)

                {

                    for (b = -1; b <2; b++)

                        if (((rows +a) == rows) && ((cols +b) == cols))

                             neighbors = neighbors;

                        else if ((board[rows +a][cols +b] == 'O') ||(board[rows +a][cols +b] == 1) || (board[rows +a][cols +b] == 0))

                            neighbors++;

                }

                if ((neighbors == 2) || (neighbors == 3))

                    board[rows][cols] = 1; /*live*/

                else if ((neighbors < 2) || (neighbors >= 4))

                    board[rows][cols] = 0; /*die*/

            }

        }

    }

}

void checknewborns (int board[HEIGHT][WIDTH])

{

    int neighbors;

    int rows;

    int cols;

    int a, b;

    for (rows =1; rows <HEIGHT -1; rows++)

    {

        for (cols = 1; cols <WIDTH -1; cols ++)

        {

            neighbors = 0;

            if (board[rows][cols] == ' ')

            {

                for (a = -1; a <2; a++)

                {

                    for (b = -1; b <2; b++)

                        if (((rows +a) == rows) && ((cols +b) == cols))

                            neighbors = neighbors;

                        else if ((board[rows +a][cols +b] == 'O') || (board[rows +a][cols +b] == 1) || (board[rows +a][cols +b] == 0))

                            neighbors++;

                }

                if ((neighbors == 3))

                    board[rows][cols] = 2; /*newborn*/

            }

        }

    }

}

void anewgeneration (int board[HEIGHT][WIDTH])

{

    int rows;

    int cols;

    for (rows =1; rows <HEIGHT -1; rows++)

    {

        for (cols = 1; cols <WIDTH -1; cols ++)

        {

            if (board[rows][cols] == 1)

                board[rows][cols] = 'O';

            else if (board[rows][cols] == 2)

                board[rows][cols] = 'O';

            else if (board[rows][cols] == 0)

                board[rows][cols] = ' ';

        }

    }

}  

int checkforexistence (int board[HEIGHT][WIDTH])

{

    int rows;

    int cols;

    int creatures =0;

    for (rows =1; rows <HEIGHT -1; rows++)

    {

        for (cols = 1; cols <WIDTH -1; cols ++)

        {

            if (board[rows][cols] == 'O')

                creatures++;

        }  

    }

    if (creatures == 0)

        return TRUE; /*all creatures died*/

    else return FALSE; /*there are still living creatures*/

}

void playgame (int board[HEIGHT][WIDTH], int numgeneration)

{

    int i, c, check;

    for (i = 1; (i <= numgeneration) && (c != 32); i++)

    {

        system("cls");

        countneighbors(board);

        checknewborns(board);

        anewgeneration(board);

        printf ("Generation: %in", i);

        printf ("Hit enter to move to the next generationn");

        display2Darray(board);

        if(kbhit())

        {

            c = getch();

            if(c == 32)

                break;

        }

        check = checkforexistence(board);

        if ((check= checkforexistence(board)) ==TRUE)

        {

            printf ("nALL CREATURES HAVE DIED: GAME OVER");

            c = 32;

        }

    }

}

int returnnumber(int anumber)

{

    if  ((anumber >50) || (anumber ==0))

    { 

        printf ("ERROR! The number must be between 1 and 50n");

        printf ("Please enter a valid number!: ");

        scanf ("%i", &anumber);

        returnnumber(anumber);

    }

    else

        return anumber;

}

void entercoordinates (int board[HEIGHT][WIDTH])

{

    int rows = 1;

    int cols =1;

    while ((rows >0) && (cols >0))

    {

        printf ("nPlease enter x coordinate(a number from 1 to 30): ");

        scanf("%i", &cols);

        cols = returnnumber(cols);

        if (cols >0)

        {

            printf ("Please enter y coordinate(a number from 1 to 50): ");

            scanf("%i", &rows);

            rows = returnnumber(rows);

            if ((rows >0) && (cols >0))

                board[rows][cols] = 'O';

        }

    }

}

void creatingpatterntypes(int board[HEIGHT][WIDTH])

{

    int type;

    printf ("nEnter <1> for creating  a BOX");

    printf ("nEnter <2> for creating  a BEEHIVE");

    printf ("nEnter <3> for creating  a TOAD");

    printf ("nEnter <4> for creating  a SHIP");

    printf ("nEnter <5> for creating  a GLIDER");

    printf ("nEnter <6> for creating  a QUEEN BEE SHUTTLE");

    printf ("nEnter <7> for creating  a PULSAR");

    printf ("nEnter <8> for creating  a BLINKER");

    printf ("nEnter <9> for creating  a PENTADECATHLONn");

    scanf ("%i", &type);



if (type == 1)

{

    board[10][10] = 'O';

    board[10][11] = 'O';

    board[11][10] = 'O';

    board[11][11] = 'O';

}

else if (type == 9)

{

    board[15][10] = 'O';

    board[15][11] = 'O';

    board[15][12] = 'O';

    board[15][13] = 'O';

    board[15][14] = 'O';

    board[15][15] = 'O';

    board[15][16] = 'O';

    board[15][17] = 'O';

    board[15][18] = 'O';

    board[15][19] = 'O';

}

else if (type == 5)

{

    board[28][3] = 'O';

    board[27][4] = 'O';

    board[26][4] = 'O';

    board[27][5] = 'O';

    board[28][5] = 'O';

}

else if (type == 3)

{

    board[18][12] = 'O';

    board[18][13] = 'O';

    board[18][14] = 'O';

    board[19][11] = 'O';

    board[19][12] = 'O';

    board[19][13] = 'O';

}

else if (type == 6)

{

    board[20][28] = 'O';

    board[20][29] = 'O';

    board[21][30] = 'O';

    board[22][31] = 'O';

    board[23][31] = 'O';

    board[24][31] = 'O';

    board[25][30] = 'O';

    board[26][29] = 'O';

    board[26][28] = 'O';

}

else if (type == 7)

{

    board[12][14] = 'O';

    board[13][13] = 'O';

    board[13][14] = 'O';

    board[13][15] = 'O';

    board[14][13] = 'O';

    board[14][15] = 'O';

    board[15][13] = 'O';

    board[15][14] = 'O';

    board[15][15] = 'O';

    board[16][14] = 'O';

}

else if (type == 8)

{

    board[12][12] = 'O';

    board[12][13] = 'O';

    board[12][14] = 'O';

}

else if (type == 4)

{

    board[12][12] = 'O';

    board[12][13] = 'O';

    board[13][12] = 'O';

    board[14][13] = 'O';

    board[14][14] = 'O';

    board[13][14] = 'O';

}

else if (type ==2)

{

    board[12][14] = 'O';

    board[13][13] = 'O';

    board[13][15] = 'O';

    board[14][13] = 'O';

    board[15][14] = 'O';

    board[14][15] = 'O';

    }

}

 void usermode(int board[HEIGHT][WIDTH])

{

    int i, generation, c, choice;

    printf ("nDo you want to insert a particular pattern type? <1> for yes and <0> for no: ");

    scanf ("%i", &choice);

    if (choice == 1)

    {

        creatingpatterntypes(board);

        display2Darray(board);

    }

    else

    {

        entercoordinates(board);

        display2Darray(board);

    }



    printf ("nPlease select a number of generation: ");

    scanf ("%i", &generation);



    playgame(board, generation);

}

void automaticmode(int board[HEIGHT][WIDTH])

{

    int i, generation, c;

    fillarrayrandomly(board);

    display2Darray(board);

    printf ("nPlease select a number of generation: ");

    scanf ("%i", &generation);



    playgame(board, generation);

}

void hybridmode (int board[HEIGHT][WIDTH])

{

    int i, generation, c;

    fillarrayrandomly(board);

    display2Darray(board);

    entercoordinates(board);

    system("cls");

    display2Darray(board);



    printf ("nPlease select a number of generation: ");

    scanf ("%i", &generation);



    playgame(board, generation);

}



int main (void)

{

    //printf ("hello. worldn");

    int board[HEIGHT][WIDTH], mode;

    makingboundarylines(board);

    fillarray(board);



    printf ("CONWAY'S GAME OF LIFEnn");

    printf ("Please hit space to terminate the program, hit enter to move to the next generationn");

    printf ("Please enter <1> for User Mode, <2> for Automatic Mode and <3> for Hybrid Mode: ");

    scanf ("%i", &mode);



if (mode == 1)

    usermode(board);

else if (mode == 2)

    automaticmode(board);

else if (mode ==3)

    hybridmode(board);



return 0;

}