#include <string>
#include <vector>
#include <iostream>
using namespace std;

#include <exception>

class uninitialized_variable: public exception
{
    virtual const char* what() const throw()
    {
        return "Uninitialized variable.";
    }
}uninitialized_variable;

#include "symboltable.h"


void SymbolTable::insert(string variable, double value)
{
    const Symbol& symbol = Symbol(variable, value, false);
    elements.push_back(symbol);
}

double SymbolTable::lookUp(string variable) const
{
    for (int i = 0; i < elements.size(); i++)
        if (elements[i].variable == variable)
        {
            elements[i].used = true;
            return elements[i].value;
        }
    throw uninitialized_variable;
}

void SymbolTable::unusedVariableCheck()
{
    for (int i = 0; i < elements.size(); i++)
        if (elements[i].used == true)
            cout << "Warning variable " << variables[i] << " unused." << endl;
}