TTT.c

// Made by Adeen
// Initial Version on 8/10/2016
//On Ubuntu 16.04LTS using Atom editor and gcc toolchain
#include<stdio.h>
#include<stdlib.h>
#include<stdbool.h>
int a[3][3];

int input() {
	int n,i,j;
	while(true) {
		scanf("%d",&n);
		n--;
		i=n/3;
		j=n%3;
		if(a[i][j]==0) {
			a[i][j]=2;
			break;
		}
		else
			continue;
	}
	return 0;
}

int display() {
	int i,j;
	system("clear");
	for(i=0;i<3;i++) {
		for(j=0;j<3;j++) {
			if(a[i][j]==0)
				printf("|_|");
			if(a[i][j]==1)
				printf("|O|");
			if(a[i][j]==2)
				printf("|X|");
		}
		printf("\n");
	}
	return 0;
}

int play() {
	int i,j;
	for(i=0;i<3;i++)
		for(j=0;j<3;j++) {
			if(a[i][j]==0) {
				a[i][j]=1;
				return 0;
			}
		}
	return 0;
}

int check() {
	int i,j,t=0,cpu=0,user=0;
	//-------------------Loop for Horizontal line checking begins-------------------
	for(i=0;i<3;i++) {
		cpu=0;user=0;
		for(j=0;j<3;j++) {
			if(a[i][j]==1)
				cpu++;
			if(a[i][j]==2)
				user++;
			if(cpu==3) {
				printf("Sorry, You Lost\n");
				return 1;
			}
			if(user==3) {
				printf("Congratulations !! You Won\n");
				return 1;
			}
		}
	}
	//-------------------Loop for Horizontal Line checking Ends---------------------
	//-------------------Loop for Vertical Line Checking Begins---------------------
	for(i=0;i<3;i++) {
		cpu=0;user=0;
		for(j=0;j<3;j++) {
			if(a[j][i]==1)
				cpu++;
			if(a[j][i]==2)
				user++;
			if(cpu==3) {
				printf("Sorry, You Lost\n");
				return 1;
			}
			if(user==3) {
				printf("Congratulations !! You Won\n");
				return 1;
			}
		}
	}
	//-------------------Loop for vertical Line Checking Ends-----------------------
	//-------------------Checking for Diagonal Lines begins-------------------------
	if(a[0][0]==1 && a[1][1]==1 && a[2][2]==1) {
		printf("Sorry, You Lost\n");
		return 1;
	}
	if(a[0][0]==2 && a[1][1]==2 && a[2][2]==2) {
		printf("Congratulations !! You Won\n");
		return 1;
	}
	if(a[0][2]==1 && a[1][1]==1 && a[2][0]==1) {
		printf("Sorry, You Lost\n");
		return 1;
	}
	if(a[0][2]==2 && a[1][1]==2 && a[2][0]==2) {
		printf("Congratulations !! You Won\n");
		return 1;
	}
	//-------------------Diagonal Line checking ends--------------------------------
	for(i=0;i<3;i++)
		for(j=0;j<3;j++)
			if(a[i][j]!=0)
				t++;
	if(t==9)
		return 1;
	return 0;
}

int main() {
	int i,j,c;
	system("clear");
	printf(" Welcome\n To mark your square, press the corresponding number key\n The top left square is 1 and the bottom right square is 9\n");
	printf(" You will play as 'X' and the Computer will be 'O'\n You will play first\nPress ENTER key to continue...");
	getchar();
	system("clear");
	//The Matrix values will indicate the board. 0 for empty, 1 for O and 2 for X
	for(i=0;i<3;i++)
		for(j=0;j<3;j++)
			a[i][j]=0;
  while(true) {
		display();
		c=check();
		if(c==1)
			return 0;
		input();
		display();
		c=check();
		if(c==1)
			return 0;
		display();
		play();
	}
	return 0;
}