The document discusses the importance of correctly defining function implementations in C++ header files. It provides examples of class definitions for 'subexpression', 'operand', and 'variable', highlighting their constructors and member functions. The text seeks guidance on improving the header file definitions.

1. C++ Improper Function Definitions in Header Files
Explanation: Ensure that the function definitions in header files (e.g., subexpression.h,
operand.h, etc.) are correctly defined.
How would I properly define the header files beyond what I have done?
subexpression.h****
classSubExpression: publicExpression{
public:
SubExpression(Expression* left, Expression* right);
staticExpression* parse(stringstream& in);
protected:
Expression* left;
Expression* right;
};
operand****
classOperand: publicExpression{
public:
staticExpression* parse(stringstream& in);
};
variable.h****
classVariable: publicOperand{
public:
Variable(string name){
this->name = name;
}
intevaluate();
private:
string name;
};