To write a game of Tic Tac Toe with two players in C using only the standard library, you can follow these steps:

1. **Declare a 2D array to store the game board.** Each element of the array can store a character representing the player's symbol (e.g., 'X' or 'O').
2. **Write a function to display the game board.** This function should print the board to the console, with each element of the array represented by a character.
3. **Write a function to get the player's move.** This function should prompt the player to enter a row and column number, and then validate the input.
4. **Write a function to make a move on the board.** This function should update the board array with the player's symbol at the specified row and column.
5. **Write a function to check if there is a winner.** This function should check all possible winning combinations (horizontal, vertical, and diagonal) to see if any player has three of their symbols in a row.
6. **Write a function to check if the game is a draw.** This function should check if all of the board spaces are filled and there is no winner.

Once you have written these functions, you can implement the main game loop:

```c
// Initialize the game board.
char board[3][3] = {{'-', '-', '-'}, {'-', '-', '-'}, {'-', '-', '-'}};

// Start the game loop.
while (true) {

    // Display the game board.
    display_board(board);

    // Get the player's move.
    int row, column;
    get_player_move(row, column);

    // Make a move on the board.
    make_move(board, row, column);

    // Check if there is a winner.
    if (check_winner(board)) {
        // A player has won!
        break;
    }

    // Check if the game is a draw.
    if (check_draw(board)) {
        // The game is a draw!
        break;
    }
}
```

You can also add additional features to your game, such as:

* Allow the player to choose their symbol at the beginning of the game.
* Implement a computer player.
* Keep track of the number of wins and losses for each player.
* Add a menu system to allow the player to choose from different game options.

This is just a basic outline of how to write a game of Tic Tac Toe in C using only the standard library. You can customize the game to your liking and add additional features.
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