never-ending do-while loop? (or something else?)

[LunaCaelum]

So I wrote this program and it's for a (fictious) company that offers multiple vacation packages and the user is supposed to choose one and answer questions to get a price quote. Anyway I have the program written but I think there's a problem with my do-while loop? Once the user enters his/her selection strings of numbers spits out in a never-ending fashion. My code is below, sorry there's a lot of it.

Is it my do-while loop or a problem elsewhere? I appreciate any help!

#include <iomanip>
#include <iostream>


using namespace std; 

//Variables:
const float climbRate = 350.0;
const float scubaRate = 1000.0;
const float skyDiveRate = 400.0;
const float caveRate = 700.0;
const float climbInstruct = 100.0;
const float scubaInstruct = 100.0;
const float dailyCampRental = 40.0;
const float dayLodge1 = 65.0; //Wilderness Lodge
const float dayLodge2 = 120.0; //Luxury Inn 
int no_of_people;
float baseChargeDiscount;

void displayMenu();
float scuba();
float skyDive();
float climbing();
float spelunk();

int x; 
 
int main ()
{
	cout << "How many people are in your party?" << endl;
	cin >>  no_of_people; 

	 displayMenu ();

	cout << "What is your selection? " << endl;
		cin >> x;

	do {
		switch (x) 
		{case 1: 
			cout << climbing;
			break;
		case 2: 
			cout << scuba;
			break;
		case 3: 
			cout << skyDive;
			break;
		case 4: 
			cout << spelunk;
			break;
		};	
	}
	while (x != 5);

	system ("pause");
	return 0;
}

void displayMenu ()
{
	 
	cout << "Please choose your vacation package." <<endl;
	cout << "MENU: " <<endl;
	cout << "1: Devil's Courthouse Adventure Weekend " <<endl;
		cout << "camping, rock-climbing and rapelling at Devil's Courthouse, " << endl;
		cout << "North Carolina. This getaway is for novices and experts alike. Optional " <<endl;
		cout << "climbing equipment rental is available." << endl; 
	cout << "2. Scuba Bahama " << endl;
		cout << "week-long cruise to the Bahamas with three days of scuba diving." <<endl;
		cout << "Optional but afforable diving lessons available for beginners." << endl;
	cout << "3. Sky-Dive Colorado " << endl;
		cout << "Four thrilling days with expert sky-diving instructors in Colorado Springs" <<endl;
		cout << "Colorado.  For lodging, choose either Wilderness Lodge or Luxury Inn." <<endl;
	cout << "4. Barron Cliff Spelunk " <<endl; 
		cout << "Eight days hikign and exploring caves in Barron Cliff Wilderness Area" << endl;
		cout << " Tennessee. Camping equipment rental available." <<endl;
	cout << "Note: A 10 percent discount on the base charges of any package is " 
		<< "given for a party of five or more." <<endl;
	cout << "5. None of the above." <<endl; 
		;
}

float climbing ()
{
	int a;
	int b;
	int c;
	float baseCharge;
	float instruction;
	float rentalCharge;
	float finalCost;

	
	cout << "How many in your party need instruction?" <<endl;
	cin >> a;
	cout << endl;

	cout << "How many advanced climbers in your party?" << endl;
	cin >> b;
	cout << endl;

	cout << "How many people in party are renting equipment?" << endl;
	cin >> c;

	//base charge 
	if ( no_of_people >= 5)
		 baseCharge = 0.10 * (climbRate * no_of_people);
	else 
		baseCharge = climbRate * no_of_people;

	//cost of instruction
	instruction = climbInstruct * a;

	//Equipment rental
	rentalCharge = (40 * c * 3);

	//total charges
	finalCost = baseCharge + instruction + rentalCharge;

	//Display 
	cout << "Your final cost of this package is:" << " " << 
		 "$" << finalCost << endl;

	return finalCost;
}

float scuba ()
{
	int a; 
	int b;
	float baseCharge;
	float instruction;
	float finalCost;
	

	cout << "How many in party need instruction?" <<endl;
	cin >> a;
	cout << endl;

	cout << "How many advanced scuba divers in your party?" << endl;
	cin >> b;
	cout << endl;

	//base charge 
	if ( no_of_people >= 5)
		 baseCharge = 0.10 * (scubaRate * no_of_people);
	else 
		baseCharge = scubaRate * no_of_people;


	//cost of instruction
	instruction = climbInstruct * a;

	//total charges
	finalCost = baseCharge + instruction;

	//Display 
	cout << "Your final cost of this package is:" << " " << 
		 "$" << finalCost << endl;

	return finalCost;
}

float skyDive ()
{
	int b;
	int c;
	float baseCharge;
	float lodgeCharge;
	float finalCost;

	//base charge
	if ( no_of_people >= 5)
		 baseCharge = 0.10 * (skyDiveRate * no_of_people);
	else 
		baseCharge = skyDiveRate * no_of_people;

	cout << "How many in party are staying at Wilderness lodge?" << endl;
		cin >> b;
	cout << "How many in party are staying at Luxury Inn?" << endl;
		cin >> c;

	//lodging charges
	lodgeCharge = (dayLodge1 * b) + (dayLodge2 * c);

	//total charges 
	finalCost = lodgeCharge + baseCharge;

	//Display 
	cout << "Your final cost of this package is:" << " " << 
		 "$" << finalCost << endl;

	return finalCost;
}

float spelunk ()
{
	int a; 
	float rental = 40;
	float baseCharge;
	float rentalCharge;
	float finalCost;

	cout << "How many people in party are renting equipment." << endl;
		cin >> a;
		
	//base charge
	if ( no_of_people >= 5)
		 baseCharge = 0.10 * (caveRate * no_of_people);
	else 
		baseCharge = caveRate * no_of_people;

	//Equipment rental
	rentalCharge = rental * a * 8;

	//total charges
	finalCost= rentalCharge + baseCharge;

	//Display 
	cout << "Your final cost of this package is:" << " " << 
		 "$" << finalCost << endl;

	return (finalCost);
}

[ResidentBiscuit]

You don't provide a way for 'x' to change, so as long as the user does not type in '5', that do...while will never end.

[LunaCaelum]

thank you for your help!