syntax error: identifier 'stringstream'

'SubExpression': 'class' type redefinition

'SubExpression': base class undefined

'BinaryExpression::evaluate': method with override specifier 'override' did not override any base class methods

'BinaryExpression': illegal member initialization: 'SubExpression' is not a base or member

'pow': no overloaded function takes $1$ arguments

$\text{'}$std::min': no matching overloaded function found

$\text{'}$std::max': no matching overloaded function found

use of undefined type 'SubExpression'

use of undefined type 'SubExpression'

'return': cannot convert from 'BinaryExpression $*\text{'}$ to 'Expression $*\text{'}$

'return': cannot convert from 'BinaryExpression $*\text{'}$ to 'Expression $*\text{'}$

'return': cannot convert from 'BinaryExpression $*\text{'}$ to 'Expression $*\text{'}$

'return': cannot convert from 'BinaryExpression $*\text{'}$ to 'Expression $*\text{'}$

'return': cannot convert from 'BinaryExpression $*\text{'}$ to 'Expression $*\text{'}$

'return': cannot convert from 'BinaryExpression $*\text{'}$ to 'Expression $*\text{'}$

'return': cannot convert from 'BinaryExpression $*\text{'}$ to 'Expression $*\text{'}$

function 'bool SubExpression::operator $==($const SubExpression &$)$ const' already has a body

function 'double Variable::evaluate$($void$)\text{'}$ already has a body

'lookUp': is not a member of 'SymbolTable'