The code enters the main function, executes the test function, then executes the menu function to print the menu, and then enters the switch according to the data entered by the player to determine whether to execute the game function or exit the game.

Entering the game function, how to initialize the chessboard, how to output the format of the chessboard, how to let the player walk the chessboard, how to let the computer walk the chessboard, how to judge the win or loss, and how to judge the draw are roughly explained in the function statement at the beginning, which is easy to understand by self reading.

#include<stdio.h>
#include<time.h>
#include<stdlib.h>


#define ROW 3
#define COL 3

//Function declaration 
void Initboard(char board[ROW][COL],int row,int col);//Initialize chessboard 
void Displayboard(char board[ROW][COL], int row, int col);//How to output chessboard format 
void PlayerMove(char board[ROW][COL], int row, int col);//Player go 
void ComputerMove(char board[ROW][COL], int row, int col);//Computer go 
char Iswin(char board[ROW][COL], int row, int col);//Judgement of winning or losing 
int IsFull(char board[ROW][COL], int row, int  col);//Is it a draw? 

void menu()
{
	printf("**************************************\n");
	printf("******      Enter 1 to start the game      *******\n");
	printf("******      Enter 0 to exit the game      *******\n");
	printf("******   '*'For players '#'for computer ***** \ n“);
	printf("**************************************\n\n");
}



void game()
{
	char board[ROW][COL] = { 0 };//Initialize chessboard
	char ret = 0;
	Initboard(board,ROW,COL);//Format chessboard 
	//Print chessboard
	printf("\n");
	Displayboard(board, ROW, COL);
	while (1)
	{
		//Player go
		PlayerMove(board,ROW,COL);
		Displayboard(board, ROW, COL);//Players print the board every step 
		ret=Iswin(board, ROW, COL);//Determine whether to end the cycle 
		if (ret != 'C')
		{
			break;
		}
		//Computer go
		ComputerMove(board,ROW,COL);
		Displayboard(board, ROW, COL);//Computer printing chessboard 
		ret=Iswin(board, ROW, COL);//Judge whether to continue the cycle 
		if (ret != 'C')
		{
			break;
		}
	}
	if (ret == '*')
	{
		printf("     Congratulations, you won\n\n\n");
	}
	else if (ret == '#')
	{
		printf("     You are too dish.\n\n\n");
	}
	else if (ret == 'Q')
	{
		printf("     It ends in a draw\n\n\n");
	}


}


void test()
{
	int input = 0;
	srand((unsigned int) time(NULL));//The time function returns the form time_t, so the unsigned int cast is required 
	do
	{

		menu();//Print menu 
		printf("Please choose:>");
		scanf("%d", &input);
		switch (input)
		{
		case 1:
			game();
			break;
		case 0:
			printf("    Do you really want to quit the game?\n\n");
			break;
		default:
			printf("    Wrong choice, take a good look at the tips!!!\n\n");
			break;
		}
	} while (input);
}


int main()
{
	test();//Main function execution 
	return 0;
}

void Initboard(char board[ROW][COL], int row, int col)//Initialize chessboard content 
{
	int i = 0;
	int j = 0;
	for (i = 0; i < row;i++)
	for (j = 0; j < col; j++)
	{
		board[i][j] = ' ';
	}
}


void Displayboard(char board[ROW][COL], int row, int col)
{
	int i = 0;
	int j = 0;
	for (i = 0; i < row; i++)//Output chessboard layout 
	{
		int j = 0;
		for (j = 0; j < col; j++)
		{
			printf(" %c ",board[i][j]);
			if (j<col-1)//Last line does not need to output '|' 
			   printf("|");
		}
		printf("\n");
		if (i < row - 1)
		{
			for (j = 0; j < col; j++)
			{
				printf("---");
				if (j<col-1)//Last column does not output '|' 
				    printf("|");
			}
			printf("\n");
		}
	}
	printf("\n");

}


void PlayerMove(char board[ROW][COL], int row, int col)
{
	int x = 0;
	int y = 0;
	printf("Player go:>");
	while (1)
	{
		printf("Please enter the coordinates to go (method: X Blank space X Enter):>");
		scanf("%d%d", &x, &y);
		if (x >= 1 && x <= row && y >= 1 && y <= col)//x and y should be within a reasonable range 
		{
			if (board[x - 1][y-1] == ' ')
			{
				board[x - 1][y - 1] = '*';
				break;
			}
			else
			{
				printf("Coordinates occupied, re-enter!\n\n");
			}
		}
		else
		{
			printf("Illegal coordinate, re input\n\n");
		}
	}
}


void ComputerMove(char board[ROW][COL], int row, int col)
{
	printf("Computer go\n");
	int x = 0;
	int y = 0;
	while (1)
	{
		x = rand() % row;//The coordinates should be within a reasonable range 
		y = rand() % col;
		if (board[x][y] == ' ')
		{
			board[x][y] = '#';
			break;
		}
	}
}



int IsFull(char board[ROW][COL], int row, int  col)
{
	int i = 0;
	int j = 0;
	for (i = 0; i < row; i++)
	{
		for (j = 0; j < col; j++)
		{
			if (board[i][j] == ' ')
			{
				//Not full
				return 0;
			}
		}
	}
	//Full
	return 1;
}



//Judgement of winning or losing
//Players win - '*'
//Computer wins
//Draw -'Q'
//Continue -'C'
char Iswin(char board[ROW][COL], int row, int col)
{
	int i = 0;
	//Row judgment
	for (i = 0; i < row; i++)
	{
		if (board[i][0] == board[i][1] && board[i][1] == board[i][2] && board[i][0] != ' ')
		{
			return board[i][0];//If it's not, it's just for the player to win, * for the computer to win 
		}
	}
	//Column judgement
	for (i = 0; i < col; i++)
	{
		if (board[0][i] == board[1][i] && board[1][i] == board[2][i] && board[0][i] != ' ')
		{
			return board[0][i];
		}
	}
	if (board[0][0] == board[1][1] && board[1][1] == board[2][2] && board[0][0] != ' ')
	{
		return board[0][0];
	}
	if (board[0][2] == board[1][1] && board[1][1] == board[2][0] && board[0][2] != ' ')
	{
		return board[0][2];
	}
	//Judgement draw
	if (IsFull(board,row,col) == 1)
	{
		return 'Q';
	}
	else
		return 'C';
}

Operation result: