simple tictactoe in go using prng

tictactoe.go

package main

import (
	"fmt"
	"math/rand"
	"os"
	"time"
)
//player=0 ; computer=1

var tiles[9]string;
var lastMoveWasBy int;

func main() {
	fmt.Println("Welcome to TicTacToe!\nThis is the playing field:");
	//add padding to make "ascii art" work
	for i := 0; i < 9; i++ {
		tiles[i] = " ";
	}
	printField(true);
	intro();
}

func intro() {
	if (getRandomInt(1)==0) {
		fmt.Println("You start!");
		askForPlayerMove();
	} else {
		fmt.Println("The computer starts");
		computerPlayMove();
	}
}

func getRandomInt(lim int) int {
    rndm := rand.New(rand.NewSource(time.Now().UnixNano()));
	return rndm.Intn(lim);
}

func computerPlayMove() {
	setTile(1, getRandomInt(8));
}

func askForPlayerMove() {
	fmt.Println("\nSo what's your move?");
	var userInput int;
	fmt.Scanf("%d", &userInput);
	setTile(0, userInput);
}

func checkTile(tilenum int) bool {
	if (!(tilenum>=0&&tilenum<=8)) {
		fmt.Println("\nThat field doesn't exist");
		askForPlayerMove();
	}
	//check if tile is empty
	if (tiles[tilenum]!=" ") {
		return false;
	} else {
		return true;
	}
}

func checkForWinEtc() {
	//checking for wins, losses, etc. in a terrible, hardcoded way
	if ( (tiles[3]=="O"&&tiles[4]=="O"&&tiles[5]=="O") || (tiles[6]=="O"&&tiles[7]=="O"&&tiles[8]=="O") || (tiles[0]=="O"&&tiles[3]=="O"&&tiles[6]=="O") || (tiles[1]=="O"&&tiles[4]=="O"&&tiles[7]=="O") || (tiles[2]=="O"&&tiles[5]=="O"&&tiles[8]=="O")	|| (tiles[0]=="O"&&tiles[4]=="O"&&tiles[8]=="O") || (tiles[2]=="O"&&tiles[4]=="O"&&tiles[6]=="O") ) {
		endgame(0);
	}
	if ( (tiles[3]=="X"&&tiles[4]=="X"&&tiles[5]=="X") || (tiles[6]=="X"&&tiles[7]=="X"&&tiles[8]=="X") || (tiles[0]=="X"&&tiles[3]=="X"&&tiles[6]=="X") || (tiles[1]=="X"&&tiles[4]=="X"&&tiles[7]=="X") || (tiles[2]=="X"&&tiles[5]=="X"&&tiles[8]=="X")	|| (tiles[0]=="X"&&tiles[4]=="X"&&tiles[8]=="X") || (tiles[2]=="X"&&tiles[4]=="X"&&tiles[6]=="X") ) {
		endgame(1);
	}
	if ( tiles[0]!=" "&&tiles[1]!=" "&&tiles[2]!=" "&&tiles[3]!=" "&&tiles[4]!=" "&&tiles[5]!=" "&&tiles[6]!=" "&&tiles[7]!=" "&&tiles[8]!=" " ) {
		endgame(2);
	}
}

func setTile(player int, tilenum int)  {
	if (checkTile(tilenum)!=true) {
		if (player==0) {
			fmt.Println("\nTile is not free");
			askForPlayerMove();
		} else {
			computerPlayMove();
		}
	}
	if (player==0) {
		tiles[tilenum] = "O";
	} else {
		tiles[tilenum] = "X";
	}
	lastMoveWasBy = player;
	prepNextMove(player);
}

func prepNextMove(player int) {
	checkForWinEtc();
	if (player==1) {
		fmt.Println("\nComputer's response\n");
	}
	printField(false);
	if (lastMoveWasBy==0) {
		computerPlayMove();
	} else {
		askForPlayerMove();
	}
}

func printField(intro bool) {
	if (intro) {
		fmt.Printf("_____________\n| %d | %d | %d |\n|———|———|———|\n| %d | %d | %d |\n|———|———|———|\n| %d | %d | %d |\n¯¯¯¯¯¯¯¯¯¯¯¯¯\n", 0, 1, 2, 3, 4, 5, 6, 7, 8);
	} else {
		fmt.Printf("_____________\n| %s | %s | %s |\n|———|———|———|\n| %s | %s | %s |\n|———|———|———|\n| %s | %s | %s |\n¯¯¯¯¯¯¯¯¯¯¯¯¯\n", tiles[0], tiles[1], tiles[2], tiles[3], tiles[4], tiles[5], tiles[6], tiles[7], tiles[8]);
	}
}
func endgame(winner int) {
	printField(false);
	if (winner==0) {
		fmt.Println("You won :)");
	} else if (winner==1) {
		fmt.Println("You lost :(");
	} else {
		fmt.Println("Stalemate :/");
	}
	os.Exit(0);
}