Exam 2 Program

#include <iostream>
#include <iomanip>

using namespace std;

bool divisibleByThree(int divisor) { // This funcion validates that the given integer is fully divisible by three
	if((divisor % 3) == 0) return true;
	else return false;
}

float divide(float operandA, float operandB) { // This function is used to define ratios of price/pound in the betterDeal function
	return (operandA / operandB);
}

void betterDeal(float priceOne, float priceTwo, float poundsOne, float poundsTwo) {
	float firstRatio = divide(priceOne, poundsOne), secondRatio = divide(priceTwo, poundsTwo);
	cout << setprecision(2) << fixed;
	cout << "Item 1 costs $" << firstRatio << " per pound, and" << endl;
	cout << "Item 2 costs $" << secondRatio << " per pound." << endl << endl;
	if(firstRatio < secondRatio) {
		cout << "Item 1 is the better deal!" << endl << endl;
	} else if(secondRatio < firstRatio) {
		cout << "Item 2 is the better deal!" << endl << endl;
	} else if(firstRatio == secondRatio) {
		cout << "Both items are the same per pound! They're BOTH a great deal!" << endl << endl;
	}
}

int main() {

	cout << "Counter-Controlled Loop Demonstration" << endl << endl;
	cout << "This is a counter loop that will display numbers on a line" << endl;
	cout << "based on what lower bound you provide to it." << endl << endl;
	cout << "To start, enter the lower bound as an integer." << endl;
	cout << "For this loop, the upper bound will be preset to 10, " << endl;
	cout << "and all numbers that are divisible by three will be excluded." << endl;
	int lowBound;
	cout << "Enter the lower bound: ";
	cin >> lowBound;
	int highBound = 10;
	cout << endl;

	for(int counter = highBound; counter >= lowBound; counter--) { // This counter uses the divisibleByThree function to include values that do not meet the function's conditions
		if(divisibleByThree(counter) == false) {
			cout << counter << " ";
		}
	}

	cout << endl << endl << "--------------------" << endl << endl;

	cout << "Character-Printing Function Demonstration" << endl << endl;
	cout << "This is a loop that will display the letters of the string" << endl;
	cout << "\"Hello World!\" in order, one line for each letter." << endl << endl;

	string message = "Hello World!";
	for(int index = 0; index < message.length(); index++) { // This loop uses the indexes of the given string to print them one-by-one per line
		cout << message[index] << endl;
	}

	cout << endl << "--------------------" << endl << endl;

	cout << "Better Deal Function Loop" << endl << endl;
	cout << "This is a loop that will run a function that will help you" << endl;
	cout << "find which of two given item-per-cost transactions are the better deal." << endl << endl;
	cout << "Would you like to find the better deal? (y/n): ";
	char input;
	cin >> input;
	while(input == 'Y' || input == 'y') { // As long as the given input is one of these two, the loop will continue to run
		float priceOne, priceTwo, poundsOne, poundsTwo;
		cout << endl << "Wonderful. To begin, enter the price of item 1, in U.S. dollars: $";
		cin >> priceOne;
		cout << "Next, enter its weight, in pounds: ";
		cin >> poundsOne;
		cout << "Now enter the price of item 2, in U.S. dollars: $";
		cin >> priceTwo;
		cout << "And its weight, in pounds: ";
		cin >> poundsTwo;
		cout << endl;

		if(priceOne > 0 && priceTwo > 0 && poundsOne > 0 && poundsTwo > 0) { // This condition validates that all given inputs are positive
			betterDeal(priceOne, priceTwo, poundsOne, poundsTwo);
		} else { // ... if one or more is negative, an error occurs.
			cout << "Error: One or more of your given prices or weights is" << endl;
			cout << "less than zero, and in order to run this function," << endl;
			cout << "all values must be greater than zero. Please try again." << endl << endl;
		}

		cout << "Would you like to find another great deal? (y/n): "; // Rerun the loop if the char inputs 'Y' or 'y' are met again
		cin >> input;

		if(input == 'N' || input == 'n') break; // Inputting the char 'N' or 'n' will terminate the loop
	}

	cout << endl << "Thank you for viewing these awesome loop demonstrations!" << endl;

	return 0;
}