/* CS401 - Intro to CompSci
   code from week 6

	cut and paste this into your compiler's editor if you want
	to run any of the programs.
*/

/*************************************************************************/

// Bob & Doug McKenzie
#include <iostream>
#include <string>
using namespace std;

int BDtoMetric(int);		// prototype

int main() {
	int valToConvert, answer;
	cout << "Gimmee an integer, you hoser: ";
	cin >> valToConvert;

	// call the Bob & Doug function
	answer = BDtoMetric(valToConvert);

	// display the result
	cout << valToConvert << " is " << answer << " in metric.\n";

	return 0;
}

// definition of BDtoMetric() - "double it and add 30"
int BDtoMetric(int x) {
	return (2*x + 30);
}


/* alternate (longer) definition

   int BDtoMetric(int x) {
		int result;
		result = 2*x + 30;
		return result;
	}

*/

/*************************************************************************/

// a parameterless, void function
#include <iostream>
#include <string>
using namespace std;

void myFunc();

int main() {
	cout << "I'm in main()\n";
	myFunc();		// transfers control, void so no return value here
	cout << "Back in main()\n";
}

// definition of (the mostly useless) myFunc()
void myFunc() {
	cout << "I'm in myFunc()!\n";
	return;		// not necessary
}

/*************************************************************************/

// uses a boolean function, used to verify relative humidity input
#include <iostream>
#include <string>
using namespace std;

bool acceptableRH(double);

int main() {
	double relHum;

	//
	// other code
	//  
	
	cout << "Please enter the relative humidity (between 0.0 and 1.0): ";
	cin >> relHum;

	// verify it - loop while it is bad input
	while (! acceptableRH(relHum)) {
		cout << "Out of range.  Please try again: ";
		cin >> relHum;
	}

	//
	// other code
	//

}
// end main()

// definition of acceptableRH() - it returns a boolean
bool acceptableRH(double d) {
	return ((0.0 <= d) && (d <= 1.0));
}



/* alternate definition - longer, but might make better sense to you 

	bool acceptableRH(double d) {
		bool result;
		result = (0.0 <= d) && (d <= 1.0);
		return result;
	}

*/


/*************************************************************************/

// same program, but with more robust range checking.
#include <iostream>
#include <string>
using namespace std;

bool withinRange(double, double, double);

int main() {
	double relHum;

	//
	// other code
	//  
	
	cout << "Please enter the relative humidity (between 0.0 and 1.0): ";
	cin >> relHum;

	// verify it - loop while it is bad input
	while (! withinRange(relHum, 0.0, 1.0)) {
		cout << "Out of range.  Please try again: ";
		cin >> relHum;
	}

	//
	// other code
	//

}
// end main()

// definition of acceptableRH() - it returns a boolean
bool acceptableRH(double d, double low, double high) {
	return ((low <= d) && (d <= high));
}

/*************************************************************************/