Nested if program

[iluv41]

I am a beginning programmer and I've written this program to give 1 of 4 diagnoses based on the answers given.

Two questions:
1) Is there a more efficient way I could code this?
2) The program does not work properly if I enter:
y
y
y
y
98.6

The result should be to go see a specialist but the program is telling me it's a cold. It should not be a cold since there's achiness and a headache. What is the potential problem?

#include <iostream>
#include <iomanip>

using namespace std;

int main()
{ 
	const double VISIT = 40.00,	
		PRESCRIPTION = 15.00;
	char runnyNose,
		nasalCongestion,
		achy,
		headache;
	double temperature;

	cout << setprecision(2) << fixed << showpoint;	

	cout << endl << "Do you have a runny nose? (Enter 'y' or 'n') "; 	//obtain information from patient
	cin >> runnyNose;
	cout << endl << "Are you experiencing nasal congestion? (Enter 'y' or 'n') "; 
	cin >> nasalCongestion;
	cout << endl << "Are you feeling achy all over? (Enter 'y' or 'n') ";
	cin >> achy;
	cout << endl << "Do you have a severe headache behind one eye? (Enter 'y' or 'n') ";
	cin >> headache;
	cout << endl << "What is you temperature? "; 
	cin >> temperature;

	if ((runnyNose == 'y') && (nasalCongestion == 'y') && (temperature < 99.0))
	{
		cout << endl << "You have a cold.\n"
		"Rest and drink plenty of fluids.\n"
		"Your bill is $" << VISIT << ".\n";
	}
	else if ((runnyNose == 'y') && (nasalCongestion == 'y') && (achy == 'y') && (temperature >= 99.0) && (temperature < 101.0))
	{
		cout << endl << "You have respiratory influenza.\n"
		"Rest, drink plenty of fluids, and take Tylenol or aspirin.\n"
		"Your bill is $" << VISIT << ".\n";
	}
	else if ((runnyNose == 'y') && (nasalCongestion == 'y') && (achy == 'y') && (headache == 'y') && (temperature >= 101.0))
	{
		cout << endl << "You have sinusitis.\n"
		"Rest, drink plenty of fluids, take Tylenol or aspirin, and take.\n"
		"250mg of penicillin 4 times a day.\n"
		"Your bill is $" << VISIT + PRESCRIPTION << ".\n";
	}
	else
		cout << endl << "Sorry, you need to see a specialist.\n"
		"Your bill is $" << VISIT << ".\n";

	system("pause");
	return 0;
}

[Zhuge]

You need to add conditions that the third and fourth answers must be 'n', otherwise it doesn't matter what they are when considering the requirements to be diagnosed with a cold.