Tons of Errors, Please Help.

[taserman21]

What is Ostream Operator?

  #include <iostream>
#include <ostream>
#include <unistd.h>

using namespace std;

long double firstVariable(0);

long double secondVariable(0);

long double total(0);

wchar_t op();

int totalApplier();

void titleScreenPause() 

int titleScreen(0);

int main()
{

	cout << "Welcome to Calculator_For_Linux" << endl;
	
	void titleScreenPause();

	cout << "1: Start 2: Themes 3: About 4: Exit" << endl;
	
	cin >> titleScreen;
	
	if ( titleScreen == 1 )
	{ 
	  
	  cout << "Ok, enter the first variable (Ex. 1)" << endl;
	  
	  cin >> firstVariable << endl;
	  
	  cout << "Ok, now enter an operator (Ex. +)" << endl;
	  
	  cin >> op << endl;
	  
	  cout << "Ok, now enter a second and final variable. (Ex. 1)" << endl;
	  
	  cin >> secondVariable << endl;
	  
	}
	
	else if ( titleScreen == 4 );
	{
	}
	
	return 0;
	
}

void totalApplier()
{
  
  if( op == + )
  {
    total = firstVariable + secondVariable;
    cout << total << endl;
  }
  
  else if( op == -)
  {
    total = firstVariable - secondVariable;
    cout << total;
  }

void titleScreenPause()
{
  sleep(5);
}

I am using Ubuntu KDE Trusty, and my compiler is g++.

Whenever I try to compile the code above g++ outputs:

CFL.cpp:19:1: error: expected initializer before 'int'
int titleScreen(0);
^
CFL.cpp: In function 'int main()':
CFL.cpp:30:9: error: 'titleScreen' was not declared in this scope
cin >> titleScreen;
^
CFL.cpp:37:25: error: no match for 'operator<<' (operand types are 'std::basic_istream<char>::__istream_type {aka std::basic_istream<char>}' and '<unresolved overloaded function type>')
cin >> firstVariable << endl;
^
CFL.cpp:37:25: note: candidates are:
In file included from /usr/include/c++/4.8/string:52:0,
from /usr/include/c++/4.8/bits/locale_classes.h:40,
from /usr/include/c++/4.8/bits/ios_base.h:41,
from /usr/include/c++/4.8/ios:42,
from /usr/include/c++/4.8/ostream:38,
from /usr/include/c++/4.8/iostream:39,
from CFL.cpp:1:
/usr/include/c++/4.8/bits/basic_string.h:2753:5: note: template<class _CharT, class _Traits, class _Alloc> std::basic_ostream<_CharT, _Traits>& std::operator<<(std::basic_ostream<_CharT, _Traits>&, const std::basic_string<_CharT, _Traits, _Alloc>&)
operator<<(basic_ostream<_CharT, _Traits>& __os,
^

That's the most I could fit.

I know it's a lot, but I want to learn C++ really bad and this is killing me.

[keskiverto]

Start with the first error:

19:1: error: expected initializer before 'int'
int titleScreen(0);
^

"Before int". What is before int?
Nothing on line 19.
Nothing on line 18.
Line 17 has a function declaration, but look at the very end of it. Something missing there?

[taserman21]

Start with the first error:
19:1: error: expected initializer before 'int'
int titleScreen(0);
^

"Before int". What is before int?
Nothing on line 19.
Nothing on line 18.
Line 17 has a function declaration, but look at the very end of it. Something missing there?

Ok, I fixed that but it still outputs similar if not the same errors.

[keskiverto]

Line 37: what is logically wrong with cin << endl;

Line 13: Do you realize that wchar_t op(); declares a function that takes no parameters, has name "op" and returns a w_char? This syntax has nickname "C++'s most vexing parse". Overall, you should avoid global variables, but if you absolutely have to have a global character variable, then wchar_t op;