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tic-tac-toe.c
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tic-tac-toe.c
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// A computer Tic-tac-toe player
// Oct-2020
#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <time.h>
const char bot='O',human='X'; int moves=0;
void displayGame(char tic[3][3]){
printf(" 0 1 2 \n");
printf(" ___ ___ ___\n");
printf("0 | %c | %c | %c |\n",tic[0][0],tic[0][1],tic[0][2]);
printf(" |---+---+---|\n");
printf("1 | %c | %c | %c |\n",tic[1][0],tic[1][1],tic[1][2]);
printf(" |---+---+---|\n");
printf("2 | %c | %c | %c |\n",tic[2][0],tic[2][1],tic[2][2]);
printf(" |___|___|___|\n\n");
return;
}
void userInput(char tic[3][3]){
int x,y;
a_case:{
displayGame(tic);
printf("Give Input coordinates (x,y) : ");
scanf("%d,%d",&x,&y);
getchar();//purge new-line
if((x>2)||(y>2)||(x<0)||(y<0)){
printf("Illegal Input: Program Terminated");
exit(1);
}
}
if(tic[x][y]!=' '){
printf("Already Occupied!!Try Again..\n");
goto a_case;
}
else{
tic[x][y]=human;++moves;
displayGame(tic);
}
return;
}
bool winConditions(char tic[3][3],char play){
if (
(tic[0][0] == play && tic[0][1] == play && tic[0][2] == play) ||
(tic[1][0] == play && tic[1][1] == play && tic[1][2] == play) ||
(tic[2][0] == play && tic[2][1] == play && tic[2][2] == play) ||
(tic[0][0] == play && tic[1][0] == play && tic[2][0] == play) ||
(tic[0][1] == play && tic[1][1] == play && tic[2][1] == play) ||
(tic[0][2] == play && tic[1][2] == play && tic[2][2] == play) ||
(tic[0][0] == play && tic[1][1] == play && tic[2][2] == play) ||
(tic[0][2] == play && tic[1][1] == play && tic[2][0] == play)
) return true;
else return false;
}
bool BlockWin(char tic[3][3]){
if((tic[0][0]==tic[0][1])&&tic[0][2]==' '&&tic[0][0]==bot){
tic[0][2]=bot;++moves;return true;
}else
if((tic[0][1]==tic[0][2])&&tic[0][0]==' '&&tic[0][1]==bot){
tic[0][0]=bot;++moves;return true;
}else
if((tic[0][0]==tic[0][2])&&tic[0][1]==' '&&tic[0][0]==bot){
tic[0][1]=bot;++moves;return true;
}else
if((tic[1][0]==tic[1][1])&&tic[1][2]==' '&&tic[1][0]==bot){
tic[1][2]=bot;++moves;return true;
}else
if((tic[1][1]==tic[1][2])&&tic[1][0]==' '&&tic[1][1]==bot){
tic[1][0]=bot;++moves;return true;
}else
if((tic[1][0]==tic[1][2])&&tic[1][1]==' '&&tic[1][0]==bot){
tic[1][1]=bot;++moves;return true;
}else
if((tic[2][0]==tic[2][1])&&tic[2][2]==' '&&tic[2][0]==bot){
tic[2][2]=bot;++moves;return true;
}else
if((tic[2][1]==tic[2][2])&&tic[2][0]==' '&&tic[2][1]==bot){
tic[2][0]=bot;++moves;return true;
}else
if((tic[2][0]==tic[2][2])&&tic[2][1]==' '&&tic[2][0]==bot){
tic[2][1]=bot;++moves;return true;
}else
if((tic[0][0]==tic[1][0])&&tic[2][0]==' '&&tic[0][0]==bot){
tic[2][0]=bot;++moves;return true;
}else
if((tic[0][0]==tic[2][0])&&tic[1][0]==' '&&tic[0][0]==bot){
tic[1][0]=bot;++moves;return true;
}else
if((tic[1][0]==tic[2][0])&&tic[0][0]==' '&&tic[1][0]==bot){
tic[0][0]=bot;++moves;return true;
}else
if((tic[0][1]==tic[1][1])&&tic[2][1]==' '&&tic[0][1]==bot){
tic[2][1]=bot;++moves;return true;
}else
if((tic[0][1]==tic[2][1])&&tic[1][1]==' '&&tic[0][1]==bot){
tic[1][1]=bot;++moves;return true;
}else
if((tic[1][1]==tic[2][1])&&tic[0][1]==' '&&tic[1][1]==bot){
tic[0][1]=bot;++moves;return true;
}else
if((tic[0][2]==tic[1][2])&&tic[2][2]==' '&&tic[0][2]==bot){
tic[2][2]=bot;++moves;return true;
}else
if((tic[0][2]==tic[2][2])&&tic[1][2]==' '&&tic[0][2]==bot){
tic[1][2]=bot;++moves;return true;
}else
if((tic[1][2]==tic[2][2])&&tic[0][2]==' '&&tic[1][2]==bot){
tic[0][2]=bot;++moves;return true;
}else
if((tic[0][0]==tic[1][1])&&tic[2][2]==' '&&tic[0][0]==bot){
tic[2][2]=bot;++moves;return true;
}else
if((tic[0][0]==tic[2][2])&&tic[1][1]==' '&&tic[0][0]==bot){
tic[1][1]=bot;++moves;return true;
}else
if((tic[1][1]==tic[2][2])&&tic[0][0]==' '&&tic[1][1]==bot){
tic[0][0]=bot;++moves;return true;
}else
if((tic[0][2]==tic[1][1])&&tic[2][0]==' '&&tic[1][1]==bot){
tic[2][0]=bot;++moves;return true;
}else
if((tic[2][0]==tic[0][2])&&tic[1][1]==' '&&tic[2][0]==bot){
tic[1][1]=bot;++moves;return true;
}else
if((tic[2][0]==tic[1][1])&&tic[0][2]==' '&&tic[2][0]==bot){
tic[0][2]=bot;++moves;return true;
}else
if((tic[0][0]==tic[0][1])&&tic[0][2]==' '&&tic[0][0]==human){
tic[0][2]=bot;++moves;return true;
}else
if((tic[0][1]==tic[0][2])&&tic[0][0]==' '&&tic[0][1]==human){
tic[0][0]=bot;++moves;return true;
}else
if((tic[0][0]==tic[0][2])&&tic[0][1]==' '&&tic[0][0]==human){
tic[0][1]=bot;++moves;return true;
}else
if((tic[1][0]==tic[1][1])&&tic[1][2]==' '&&tic[1][0]==human){
tic[1][2]=bot;++moves;return true;
}else
if((tic[1][1]==tic[1][2])&&tic[1][0]==' '&&tic[1][1]==human){
tic[1][0]=bot;++moves;return true;
}else
if((tic[1][0]==tic[1][2])&&tic[1][1]==' '&&tic[1][0]==human){
tic[1][1]=bot;++moves;return true;
}else
if((tic[2][0]==tic[2][1])&&tic[2][2]==' '&&tic[2][0]==human){
tic[2][2]=bot;++moves;return true;
}else
if((tic[2][1]==tic[2][2])&&tic[2][0]==' '&&tic[2][1]==human){
tic[2][0]=bot;++moves;return true;
}else
if((tic[2][0]==tic[2][2])&&tic[2][1]==' '&&tic[2][0]==human){
tic[2][1]=bot;++moves;return true;
}else
if((tic[0][0]==tic[1][0])&&tic[2][0]==' '&&tic[0][0]==human){
tic[2][0]=bot;++moves;return true;
}else
if((tic[0][0]==tic[2][0])&&tic[1][0]==' '&&tic[0][0]==human){
tic[1][0]=bot;++moves;return true;
}else
if((tic[1][0]==tic[2][0])&&tic[0][0]==' '&&tic[1][0]==human){
tic[0][0]=bot;++moves;return true;
}else
if((tic[0][1]==tic[1][1])&&tic[2][1]==' '&&tic[0][1]==human){
tic[2][1]=bot;++moves;return true;
}else
if((tic[0][1]==tic[2][1])&&tic[1][1]==' '&&tic[0][1]==human){
tic[1][1]=bot;++moves;return true;
}else
if((tic[1][1]==tic[2][1])&&tic[0][1]==' '&&tic[1][1]==human){
tic[0][1]=bot;++moves;return true;
}else
if((tic[0][2]==tic[1][2])&&tic[2][2]==' '&&tic[0][2]==human){
tic[2][2]=bot;++moves;return true;
}else
if((tic[0][2]==tic[2][2])&&tic[1][2]==' '&&tic[0][2]==human){
tic[1][2]=bot;++moves;return true;
}else
if((tic[1][2]==tic[2][2])&&tic[0][2]==' '&&tic[1][2]==human){
tic[0][2]=bot;++moves;return true;
}else
if((tic[0][0]==tic[1][1])&&tic[2][2]==' '&&tic[0][0]==human){
tic[2][2]=bot;++moves;return true;
}else
if((tic[0][0]==tic[2][2])&&tic[1][1]==' '&&tic[0][0]==human){
tic[1][1]=bot;++moves;return true;
}else
if((tic[1][1]==tic[2][2])&&tic[0][0]==' '&&tic[1][1]==human){
tic[0][0]=bot;++moves;return true;
}else
if((tic[0][2]==tic[1][1])&&tic[2][0]==' '&&tic[1][1]==human){
tic[2][0]=bot;++moves;return true;
}else
if((tic[2][0]==tic[0][2])&&tic[1][1]==' '&&tic[2][0]==human){
tic[1][1]=bot;++moves;return true;
}else
if((tic[2][0]==tic[1][1])&&tic[0][2]==' '&&tic[2][0]==human){
tic[0][2]=bot;++moves;return true;
}else
return false;
}
void BotFirstMoveFour(char tic[3][3]){
int q=moves;
if(moves==q&&tic[0][0]==bot&&tic[0][2]==bot&&tic[1][1]==' '&&((tic[2][2]==' '&&tic[1][2]==' ')||(tic[2][0]==' '&&tic[1][0]==' '))){
tic[1][1]=bot;++moves;
}else
if(moves==q&&tic[0][0]==bot&&tic[2][0]==bot&&tic[1][1]==' '&&((tic[0][2]==' '&&tic[2][2]==' ')||(tic[2][2]==' '&&tic[2][1]==' '))){
tic[1][1]=bot;++moves;
}else
if(moves==q&&tic[0][0]==bot&&tic[2][2]==bot&&tic[1][0]==' '&&tic[2][1]==' '&&tic[2][0]==' '){
tic[2][0]=bot;++moves;
}else
if(moves==q&&tic[0][0]==bot&&tic[2][2]==bot&&tic[0][2]==' '&&tic[0][1]==' '&&tic[1][2]==' '){
tic[0][2]=bot;++moves;
}else
if(moves==q&&tic[2][2]==bot&&tic[2][0]==bot&&tic[1][1]==' '&&((tic[0][2]==' '&&tic[1][2]==' ')||(tic[0][0]==' '&&tic[1][0]==' '))){
tic[1][1]=bot;++moves;
}else
if(moves==q&&tic[2][2]==bot&&tic[0][2]==bot&&tic[1][1]==' '&&((tic[0][0]==' '&&tic[0][1]==' ')||(tic[2][1]==' '&&tic[2][0]==' '))){
tic[1][1]=bot;++moves;
}else
if(moves==q&&tic[2][0]==bot&&tic[0][2]==bot&&tic[2][2]==' '&&tic[2][1]==' '&&tic[1][2]==' '){
tic[2][2]=bot;++moves;
}else
if(moves==q&&tic[2][0]==bot&&tic[0][2]==bot&&tic[0][0]==' '&&tic[0][1]==' '&&tic[1][0]==' '){
tic[0][0]=bot;++moves;
}else{
for(int d=0;d<3;d++){
for(int o=0;o<3;o++){
if(tic[d][o]==' '){
tic[d][o]=bot;++moves;return;}}}
}
}
void BotMoveFirst(char tic[3][3]){
if(moves==0){
srand(time(NULL));
int q= rand()%4+1;
if(q==1) tic[0][0]=bot;
else if(q==2) tic[0][2]=bot;
else if(q==3) tic[2][0]=bot;
else if(q==4) tic[2][2]=bot;
++moves;return;
}
if(moves==2){
if(tic[1][1]==human){
srand(time(NULL));
int q=rand()%2+1;
if(q==1&&moves==2&&tic[0][0]==bot) {tic[2][2]=bot;++moves;}
if(q==1&&moves==2&&tic[0][2]==bot) {tic[2][0]=bot;++moves;}
if(q==1&&moves==2&&tic[2][0]==bot) {tic[0][2]=bot;++moves;}
if(q==1&&moves==2&&tic[2][2]==bot) {tic[0][0]=bot;++moves;}
if(q==2&&moves==2&&(tic[0][0]==bot||tic[2][0]==bot)) {tic[1][2]=bot;++moves;}
if(q==2&&moves==2&&(tic[0][2]==bot||tic[2][2]==bot)) {tic[1][0]=bot;++moves;}
}
else {
if(tic[0][0]==bot){
if(moves==2&&tic[0][1]==' '&&tic[0][2]==' '){tic[0][2]=bot;++moves;}
if(moves==2&&tic[1][0]==' '&&tic[2][0]==' '){tic[2][0]=bot;++moves;}
if(moves==2&&tic[2][2]==' '){tic[2][2]=bot;++moves;}
}else
if(tic[0][2]==bot){
if(moves==2&&tic[0][1]==' '&&tic[0][0]==' '){tic[0][0]=bot;++moves;}
if(moves==2&&tic[2][0]==' '){tic[2][0]=bot;++moves;}
if(moves==2&&tic[1][2]==' '&&tic[2][2]==' '){tic[2][2]=bot;++moves;}
}else
if(tic[2][0]==bot){
if(moves==2&&tic[0][2]==' '){tic[0][2]=bot;++moves;}
if(moves==2&&tic[0][0]==' '&&tic[1][0]==' '){tic[0][0]=bot;++moves;}
if(moves==2&&tic[2][2]==' '&&tic[2][1]==' '){tic[2][2]=bot;++moves;}
}else
if(tic[2][2]==bot){
if(moves==2&&tic[2][1]==' '&&tic[2][0]==' '){tic[2][0]=bot;++moves;}
if(moves==2&&tic[1][2]==' '&&tic[0][2]==' '){tic[0][2]=bot;++moves;}
if(moves==2&&tic[0][0]==' '){tic[0][0]=bot;++moves;}
}
return;
}
}
if(moves==4){
int x=BlockWin(tic);
if(x==false) BotFirstMoveFour(tic);
return;
}
if(moves==6) {int zx=BlockWin(tic);
if(zx==false){
for(int a=0;a<3;a++){
for(int y=0;y<3;y++){
if(tic[a][y]==' '){
tic[a][y]=bot;++moves;return;
}
}
}
}
}
}
bool casecheck=false;
void BotMoveSecond(char tic[3][3]){
if(moves==1){
if(tic[1][1]!=human){
tic[1][1]=bot;++moves;
}
else{
srand(time(NULL));
int z= rand()%4+1;
if(z==1) tic[0][0]=bot;
else if(z==2) tic[0][2]=bot;
else if(z==3) tic[2][0]=bot;
else if(z==4) tic[2][2]=bot;
++moves;return;
}
}
if(moves==3){
int q=BlockWin(tic);
if(q==false&&tic[1][1]==bot){
if((tic[0][1]==human&&tic[2][1]==human)||(tic[1][0]==human&&tic[1][2]==human)){
srand(time(NULL));
int e= rand()%4+1;
if(e==1) tic[0][0]=bot;
else if(e==2) tic[0][2]=bot;
else if(e==3) tic[2][0]=bot;
else if(e==4) tic[2][2]=bot;
casecheck=true;++moves;return;
}
}else
if(q==false){
if(tic[1][1]==bot){
if(tic[0][1]==' '){
tic[0][1]=bot;++moves;return;
}
if(tic[2][1]==' '){
tic[2][1]=bot;++moves;return;
}
if(tic[1][0]==' '){
tic[1][0]=bot;++moves;return;
}
if(tic[1][2]==' '){
tic[1][2]=bot;++moves;return;
}
}
}
}
if(moves==3){
if(tic[1][1]==human){
srand(time(NULL));
int g=rand()%2+1;
if((tic[0][0]==human&&tic[2][2]==bot)||(tic[2][2]==human&&tic[0][0]==bot)){
if(g==1){tic[2][0]=bot;++moves;return;}
if(g==2){tic[0][2]=bot;++moves;return;}
}
if((tic[2][0]==human&&tic[0][2]==bot)||(tic[0][2]==human&&tic[2][0]==bot)){
if(g==1){tic[2][2]=bot;++moves;return;}
if(g==2){tic[0][0]=bot;++moves;return;}
}
}
}
if(moves==3){
if(tic[1][1]==bot){
if(tic[0][0]==human&&tic[2][2]==' '&&tic[0][2]==' '&&tic[2][0]==' '){tic[2][2]=bot;++moves;return;}
if(tic[2][2]==human&&tic[0][0]==' '&&tic[0][2]==' '&&tic[2][0]==' '){tic[0][0]=bot;++moves;return;}
if(tic[2][0]==human&&tic[0][2]==' '&&tic[0][0]==' '&&tic[2][2]==' '){tic[0][2]=bot;++moves;return;}
if(tic[0][2]==human&&tic[2][0]==' '&&tic[0][0]==' '&&tic[2][2]==' '){tic[2][0]=bot;++moves;return;}
}
}
if(moves==3&&tic[1][1]==bot){
srand(time(NULL));
int gi=rand()%2+1;
if(tic[0][0]==human&&tic[2][2]==human){
if(gi==1){tic[0][1]=bot;++moves;return;}
if(gi==2){tic[2][1]=bot;++moves;return;}
}
if(tic[2][0]==human&&tic[0][2]==human){
if(gi==1){tic[1][0]=bot;++moves;return;}
if(gi==2){tic[1][2]=bot;++moves;return;}
}
}
if(moves==5){
if(casecheck==true){
for(int j=0;j<3;j++){
if(tic[0][j]==human&&tic[1][j]==human&&tic[2][j]==' '){
tic[2][j]=bot;++moves;return;
}
if(tic[1][j]==human&&tic[2][j]==human&&tic[0][j]==' '){
tic[0][j]=bot;++moves;return;
}
if(tic[j][0]==human&&tic[j][1]==human&&tic[j][2]==' '){
tic[j][2]=bot;++moves;return;
}
if(tic[j][2]==human&&tic[j][1]==human&&tic[j][0]==' '){
tic[j][0]=bot;++moves;return;
}
}
}
else
if(BlockWin(tic)==false){
for(int d=0;d<3;d++){
for(int o=0;o<3;o++){
if(tic[d][o]==' '){
tic[d][o]=bot;++moves;return;}}}
}
}
if(moves==7){
int bw=BlockWin(tic);
if(bw==false){
for(int d=0;d<3;d++){
for(int o=0;o<3;o++){
if(tic[d][o]==' '){
tic[d][o]=bot;++moves;return;
}
}
}
}
}
}
int main(void){
char tic[3][3],q;int h,b;
for(int w=0;w<3;w++){for(int e=0;e<3;e++)tic[w][e]=' ';}
// "do u want to start first" loop ; q= y/n;
while(1){
printf("Player - X Bot - O\n");
printf("Do you want to start first? (y/n) :");
scanf("%c",&q);
getchar();//purge new-line
if((q=='y')||(q=='n'))break;
if((q!='y')||(q!='n'))printf("Illegal Input \n");
}
if(q=='y'){
while(1){
userInput(tic);
h=winConditions(tic,human);
b=winConditions(tic,bot);
if(h==true) {printf("\nYou Won\n");break;}
if(b==true) {printf("\nBot Won\n");break;}
if(moves==8) {printf("\nIt's a Draw\n");break;}
BotMoveSecond(tic);
h=winConditions(tic,human);
b=winConditions(tic,bot);
if(h==true) {printf("\nYou Won\n");break;}
if(b==true) {printf("\nBot Won\n");break;}
if(moves==8) {printf("\nIt's a Draw\n");break;}
}
}
if(q=='n'){
while(1){
BotMoveFirst(tic);
h=winConditions(tic,human);
b=winConditions(tic,bot);
if(h==true) {printf("\nYou Won\n");break;}
if(b==true) {printf("\nBot Won\n");break;}
if(moves==8) {printf("\nIt's a Draw\n");break;}
userInput(tic);
h=winConditions(tic,human);
b=winConditions(tic,bot);
if(h==true) {printf("\nYou Won\n");break;}
if(b==true) {printf("\nBot Won\n");break;}
if(moves==8) {printf("\nIt's a Draw\n");break;}
}
}
return 0;
}