Why Am I Getting a \'Non-standard Syntax\' Error in My C Code?

Understanding the "non-standard syntax" Error

When writing code in C , programmers often encounter errors like "non-standard syntax." This error occurs when an operation is performed using syntax that is not officially recognized by the C language.

Issue: Missing Member Function Pointer

In your specific case, the error originates from the following code:

<code class="cpp">void TicTacToe::player1Move(string coordX) // ERROR
{
  cout << "Enter X: " << endl;
  cin >> coordX;
  _coordX = coordX;
}</code>

Here, the player1Move function is a member function of the TicTacToe class. However, the function name is used as a single expression, without invoking the function call syntax. According to C conventions, this is incorrect for member functions.

Resolution: Using the Address-of Operator

To correctly obtain a pointer to a member function, you need to use the address-of operator (&). This operator creates a reference to the function memory location, enabling us to access the function indirectly.

The fix to your code is:

<code class="cpp">void TicTacToe::player1Move(string coordX)
{
  cout << "Enter X: " << endl;
  cin >> coordX;
  _coordX = coordX;
}</code>

With this change, the player1Move function can be invoked correctly by other parts of the program using the . operator, like this:

<code class="cpp">TicTacToe Board;
Board.player1Move("1");</code>

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