Fraction calculator

[DragonReborn225]

hey, this program is supposed to calculate fractions, and I feel that I have most of the code down, but I can't get past the

fractions.cpp:50: error: expected primary-expression before 'char'

error, its probably something misicule, but I can't get it for the life of me. The error is in the main function. heres my code. THANK YOU SO MUCH IN ADVANCE!!!

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

void menu (char symbol);
void addFractions(int& a,int& b,int& c,int& d,int& numerator,int&
denominator);

void subtractFractions(int& a,int& b,int& c,int& d,int& numerator,int&
denominator);

void multiplyFractions (int& a,int& b,int& c,int& d,int& numerator,int&
denominator);

void divideFractions (int& a,int& b,int& c,int& d,int& numerator,int&
denominator);
 
int main()
{
int a, b, c, d;
int numerator;
int denominator;
char symbol;
cout << "first, we will need your numerators/denominators." << endl;
cout << "What is your first fractions numerator?" << endl;
cin>> a;
cout << "What is your first fractions denominator?" << endl;
cin >> b;
cout << "What is your second fractions numerator?" << endl;
cin >> c;
cout << "What is your second fractions denominator?" << endl;
cin >> d;

while (d == 0 || b == 0)
{
if (d == 0)
{
cout << "Your second fraction has a 0 in the denominator, what would" << 
" you like to change it to?" << endl;
cin >> d;
}
if (b == 0)
{
cout << "Your first fraction has a 0 in the denominator, what would" << 
" you like to change it to?" << endl;
cin >> b;
}
}

menu (char symbol);

return 0;
}
void menu(char symbol)
{
int a, b, c, d;
int numerator, denominator;
cout << "Have fractions that need solving??" << endl;
cout << "Well, luckily for you, you chanced upon a fractions calculator" 
<< endl;
cout << "First, we will need the operation you wish to perform." << 
endl; 
cout << "choose one of the following: + (addition), - " <<
"(subtraction), * (multiplication), and finally / (division)." << endl;
cin >> symbol;
cout << endl;

switch (symbol)
{
case '*':
        multiplyFractions(a,b,c,d,numerator, denominator);

        cout << "Answer is " << numerator << "/" << denominator << endl;
break;

case '/':
       divideFractions(a,b,c,d,numerator, denominator);


        cout << "Answer is " << numerator << "/" << denominator << endl;
break;

case '+':
       addFractions(a,b,c,d,numerator, denominator);


        cout << "Answer is " << numerator << "/" << denominator << endl;
break;

case '-':
      subtractFractions(a,b,c,d,numerator, denominator);

        cout << "Answer is " << numerator << "/" << denominator << endl;
break;

default:
        cout << "Invalid input, pay better attention next time." << 
endl;
}
}

void addFractions (int& a,int& b,int& c,int& d,int& numerator,int&
denominator)

{
int temp;  
temp =  b*d;
numerator = (temp/b*a)+(temp/d*c);
denominator = temp;
}

void subtractFractions (int& a,int& b,int& c,int& d,int& numerator,int&
denominator)

{
int temp;
temp =  b*d;
numerator = (temp/b*a)-(temp/d*c);
denominator = temp;
} 

void multiplyFractions(int& a,int& b,int& c,int& d,int& numerator,int&
denominator)

{ 
numerator = (a*c); 
denominator = (b*d);
}

void divideFractions(int& a,int& b,int& c,int& d,int& numerator,int&  
denominator)
{
numerator = (a*d);
denominator = (b*c);
}

[Freaky_Chris]

menu (char symbol); Should be menu (symbol); Chris

[emotionalone]

You were also missing a bracket here and there
You also didn't need addresses when passing the values of a, b, c and d
You might not want the code but I did it anyway cos it's fun.

#include <iostream>
#include <string>

using namespace std;

void menu(int a, int b, int c, int d, char symbol);

void addFractions(int a,int b, int c, int d, int &numerator, int &denominator);

void subtractFractions(int a, int b, int c, int d, int &numerator, int &denominator);

void multiplyFractions (int a, int b, int c, int d, int &numerator, int &denominator);

void divideFractions (int a, int b, int c, int d, int &numerator, int &denominator);

//-------------------------------------------------------------------------
int main()
{
  int a, b, c, d;
  int numerator;
  int denominator;
  char symbol;
  cout << "first, we will need your numerators/denominators." << endl;
  cout << "What is your first fractions numerator?" << endl;
  cin>> a;
  cout << "What is your first fractions denominator?" << endl;
  cin >> b;
  cout << "What is your second fractions numerator?" << endl;
  cin >> c;
  cout << "What is your second fractions denominator?" << endl;
  cin >> d;
  while (d == 0 || b == 0)
  {
    if (d == 0)
    {
      cout << "Your second fraction has a 0 in the denominator, what would" <<
              " you like to change it to?" << endl;
      cin >> d;
    }
    if (b == 0)
    {
      cout << "Your first fraction has a 0 in the denominator, what would" <<
              " you like to change it to?" << endl;
      cin >> b;
    }
  }
  menu(a, b, c, d, symbol);
  return 0;
}

//--------------------------------------------------------------------

void menu(int a, int b, int c, int d, char symbol)
{
  int numerator, denominator;
  cout << "Have fractions that need solving??" << endl;
  cout << "Well, luckily for you, you chanced upon a fractions calculator"
  << endl;
  cout << "First, we will need the operation you wish to perform." <<
  endl;
  cout << "choose one of the following: + (addition), - " <<
  "(subtraction), * (multiplication), and finally / (division)." << endl;
  cin >> symbol;
  cout << endl;

  switch (symbol)
  {
  case '*':
    multiplyFractions(a,b,c,d,numerator, denominator);
    cout << "Answer is " << numerator << "/" << denominator << endl;
    system("pause>nul");
    break;
  case '/':
    divideFractions(a,b,c,d,numerator, denominator);
    cout << "Answer is " << numerator << "/" << denominator << endl;
    system("pause>nul");
    break;
  case '+':
    addFractions(a, b, c, d, numerator, denominator);
    cout << "Answer is " << numerator << "/" << denominator << endl;
    system("pause>nul");
    break;
  case '-':
    subtractFractions(a,b,c,d,numerator, denominator);
    cout << "Answer is " << numerator << "/" << denominator << endl;
    system("pause>nul");
    break;
  default:
    cout << "Invalid input, pay better attention next time." << endl;
  }
}

void addFractions (int a, int b, int c, int d, int &numerator, int &denominator)
{
  numerator = (a*d) + (b*c);
  denominator = (b*d);
}

void subtractFractions (int a, int b, int c, int d, int &numerator, int &denominator)
{
  numerator = (a*d)-(b*c);
  denominator = (b*d);
}

void multiplyFractions(int a, int b, int c, int d, int &numerator, int&denominator)
{
  numerator = (a*c);
  denominator = (b*d);
}

void divideFractions(int a, int b, int c, int d, int &numerator, int &denominator)
{
  numerator = (a*d);
  denominator = (b*c);
}

Regards..

P.S. Try to tab your statements so it's easier to catch when you're missing brackets.