void initializeBoard()
{
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
board[i][j] = ' ';
}
}
int count = 1;
printf("\n\n\t ");
for(int i = 0; i < 3; i++)
{
for(int j = 0; j < 3; j++)
{
printf("%d", count++);
if (j < 2)
{
printf(" | ");
}
}
if (i < 2)
printf("\n\t----------------\n\t ");
}
printf("\n\n\n");
}
// Function shows the game board
void showBoard(int x, int y)
{
printf("\n\n\t ");
for (int i = 0; i < 3; i++)
{
for (int j = 0; j < 3; j++)
{
printf("%c", board[i][j]);
if (j < 2)
{
printf(" | ");
}
}
if (i < 2)
printf("\n\t----------------\n\t ");
}
printf("\n\n\n");
}
// Function to update the game board
int updateBoard(int cell, char playerSign)
{
int row = (cell - 1) / 3;
int col = (cell - 1) % 3;
int isValid = 1;
// accessing already played cell number
if (board[row][col] != ' ')
{
printf("\nInvalid: Cell is already Filled!\n");
isValid = 0;
}
// valid cell position
else
{
board[row][col] = playerSign;
}
showBoard(row, col);
return isValid;
}
// Function to check the winner of the game
int checkWinner(char sg)
{
// check all rows
if (board[0][0] == sg && board[0][1] == sg && board[0][2] == sg ||
board[1][0] == sg && board[1][1] == sg && board[1][2] == sg ||
board[2][0] == sg && board[2][1] == sg && board[2][2] == sg)
{
return 1;
}
// check all columns
else if (board[0][0] == sg && board[1][0] == sg && board[2][0] == sg ||
board[0][1] == sg && board[1][1] == sg && board[2][1] == sg ||
board[0][2] == sg && board[1][2] == sg && board[2][2] == sg)
{
return 1;
}
// check both diagonals
else if (board[0][0] == sg && board[1][1] == sg && board[2][2] == sg ||
board[0][2] == sg && board[1][1] == sg && board[2][0] == sg)
{
return 1;
}
// There is no winner
return 0;
}
// Start your game from here
void playTicTacToe()
{
int gameResult = 0;
int cell = 0;
int playCount = 0;
int updationResult = 1;
char playerSign = ' ';
// start playing the game
while (!gameResult && playCount < 9)
{
if (playCount % 2 == 0)
{
// player 1
printf("\nPlayer 1 [ X ] : ");
playerSign = 'X';
}
else
{
// player 2
printf("\nPlayer 2 [ O ] : ");
playerSign = 'O';
}
scanf("%d", &cell);
if (cell > 0 && cell < 10)
{
updationResult = updateBoard(cell, playerSign);
// if updation is possible
if (updationResult)
{
gameResult = checkWinner(playerSign);
// print the winner of the game
if (gameResult)
{
printf("\t *** Player %d Won!! ***\n", playerSign == 'X' ? 1 : 2);
}
playCount++;
}
}
else if (cell == -1)
{
printf("\n\tGame Terminated\n");
return;
}
else
{
printf("\nPlease Enter a valid cell value\n");
}
}
// no one won the game
if (!gameResult && playCount == 9)
{
printf("\n\t *** Draw... ***\n");
}
printf("\n\t --- Game Over --- \n");
}
int main()
{
printf("--------- Tic Tac Toe ----------\n\n");
printf("\n* Instructions \n\n");
printf("\tPlayer 1 sign = X\n");
printf("\tPlayer 2 sign = O");
printf("\n\tTo exit from game, Enter -1\n");
printf("\n\n* Cell Numbers on Board\n");
initializeBoard();
char start = ' ';
printf("\n> Press Enter to start...");
scanf("%c", &start);
if (start)
{
int userChoice = 1;
// restart the game
while (userChoice)
{
playTicTacToe();
printf("\n* Menu\n");
printf("\nPress 1 to Restart");
printf("\nPress 0 for Exit");
printf("\n\nChoice: ");
scanf("%d", &userChoice);
if (userChoice)
{
initializeBoard();
}
printf("\n");
}
}
printf("\n :: Thanks for playing Tic Tac Toe game! :: \n");
return 0;
} Write, Run & Share C Language code online using OneCompiler's C online compiler for free. It's one of the robust, feature-rich online compilers for C language, running the latest C version which is C18. Getting started with the OneCompiler's C editor is really simple and pretty fast. The editor shows sample boilerplate code when you choose language as 'C' and start coding!
OneCompiler's C online editor supports stdin and users can give inputs to programs using the STDIN textbox under the I/O tab. Following is a sample C program which takes name as input and print your name with hello.
#include <stdio.h>
int main()
{
char name[50];
printf("Enter name:");
scanf("%s", name);
printf("Hello %s \n" , name );
return 0;
}
C language is one of the most popular general-purpose programming language developed by Dennis Ritchie at Bell laboratories for UNIX operating system. The initial release of C Language was in the year 1972. Most of the desktop operating systems are written in C Language.
When ever you want to perform a set of operations based on a condition if-else is used.
if(conditional-expression) {
// code
} else {
// code
}
You can also use if-else for nested Ifs and if-else-if ladder when multiple conditions are to be performed on a single variable.
Switch is an alternative to if-else-if ladder.
switch(conditional-expression) {
case value1:
// code
break; // optional
case value2:
// code
break; // optional
...
default:
// code to be executed when all the above cases are not matched;
}
For loop is used to iterate a set of statements based on a condition.
for(Initialization; Condition; Increment/decrement){
// code
}
While is also used to iterate a set of statements based on a condition. Usually while is preferred when number of iterations are not known in advance.
while(condition) {
// code
}
Do-while is also used to iterate a set of statements based on a condition. It is mostly used when you need to execute the statements atleast once.
do {
// code
} while (condition);
Array is a collection of similar data which is stored in continuous memory addresses. Array values can be fetched using index. Index starts from 0 to size-1.
data-type array-name[size];
data-type array-name[size][size];
Function is a sub-routine which contains set of statements. Usually functions are written when multiple calls are required to same set of statements which increases re-usuability and modularity.
Two types of functions are present in C
Library functions are the in-built functions which are declared in header files like printf(),scanf(),puts(),gets() etc.,
User defined functions are the ones which are written by the programmer based on the requirement.
return_type function_name(parameters);
function_name (parameters)
return_type function_name(parameters) {
//code
}