private void addToSymbolTable(String label,int address)
    {
        boolean error = false;
        for(SymbolAddress e:symTab)
        {
            if(e.label.equals(label))
                error=true;
        }
        if(error)
        {
            System.out.println("!---------- ERROR: Label already exists ----------!");
            System.exit(0);
        }
        symTab.add(new SymbolAddress(label,address));
    }