A stupid mistake I can't see?

[Ombra]

Now, I've had quite a lot of trouble with stupid errors in my time. My time, which is very limited. I'm a fairly new programmer, and I have a situation here. I'm all good up to where I enter 'P' or 'R'. Entering an invalid character will loop back and ask for another input just fine. However, when entering a valid character, the program ends. I have no idea why it it completely missing the switch structure/the rest of int main(). I added a test at the end to see if it would just skip the switch or the entire int main, and I found out it skips the entire main function after sending back (or attempting to send back sevtype.)

I've even stumped my instructor on this one. Help is more than appreciated.

#include <iostream> 
#include <iomanip>
#include <string>
#include <time.h>
#include <stdlib.h>


using namespace std; 

string account;

char sevtype = 'a';

double amount;

int regmin;
int daymin;
int nightmin;

const double regserv = 10.00; 
const double rpermin = 0.20;
const double preserv = 25.00;
const double pperday = 0.10;
const double ppernight = 0.05;

void welcome();
void reg();
void pre();
void choice(char &sevtype);
void cou();

int main()

{ 
	
	welcome();
	
	choice(sevtype);
	
	
		switch (sevtype)
	 {
	 case 'r':
	 case 'R':
		 void reg();

     break;
	 
	 case 'p':
	 case 'P': 
		 void pre(); 

	  break;
	  
	  void cou();

	 }
}

void welcome() {
	cout << "Please enter your account password: ";  
	cin >> account;
	cout << '\n';
}

void choice(char &sevtype)
{
	while (sevtype != 'r' && sevtype != 'R' && sevtype != 'p' && sevtype != 'P')
	{
	cout << "Enter a service code: R or r (Regular), P or p (Premium): ";
    cin >> sevtype;
	cout << '\n';
	if (sevtype != 'r' && sevtype != 'R' && sevtype != 'p' && sevtype != 'P') 
	{
		cout << "Invalid.\n";
	}
}
	
	}
	
	void reg(double &amount)
	{	 
		 cout << "Enter the number of minutes used: ";
		 cin >> regmin; 
		 cout << '\n'; 
		if (regmin < 0 || regmin > 40320)
		{
			cout << "The number you have entered in invalid. You may not excede 40320 minutes or be below 1 minute.";
		}
	  if (regmin > 50)
	     {
		   amount = regserv + ((regmin - 50) * rpermin);
	     }
      else
        amount = regserv;

	}

	void pre(double &amount)
	{
		 cout << "Enter the minutes used for the day: ";
		 cin >> daymin; 
		 cout << '\n';
		 
		 if (daymin > 720 || daymin < 0)
		 {
		 	cout << "Invalid.";
		 }
		     

      if (daymin > 75) 
		  {
		  amount = preserv + ((daymin - 75) * pperday);
		}
	  else
         {
          amount = preserv;
		}
	     
		 cout << "Enter the minutes used for the night: ";
     	 cin >> nightmin; 
		 cout << '\n';
      	
      	if (nightmin > 720 || nightmin < 0)
      {
      	cout << "Invalid";
      }
      
      if (nightmin > 100)
		  {
		  amount = preserv + ((nightmin - 100) * ppernight);
		}
	  else 
		 {
		  amount = preserv; 
		}
	}
	
	void cou()
	{
		cout << "Test.";
	}

[Smac89]

int main()
{ 

  welcome();
  
  choice(sevtype);
  
  
  switch (sevtype)
  {
   case 'r':
   case 'R':
   //void reg(); Don't do this, this is like delaring a header
      reg(//Needs an amount in here);

      break;

      case 'p':
      case 'P': 
     //void pre(); Don't do this either
     pre(//Needs an amount in here); 

     break;

     default://without this, the function below will not execute
     //If you need to call that function regardless of options above
     //then you might want to call the function before the breaks in 
     //the above cases
     //ex reg(double& somenum);
     //   cou();
     //   break;



    //void cou();
     cou();

   }
 }

This means you have to redo your function headers as:

void reg(double&);
void pre(double&);

[Ombra]

I need a slap on the head for that one. Thanks so much, mate.