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Functions by Value and Reference

khatereh (41)
Hi,

I'm working on my assignment.
Here is the requirements:
1. Create a first function that gets an input from the user for 3 different pizza sizes (in inches), and their prices accordingly. Validate user input, therefore only the proper price and pizza size should be accepted. The valid ranges for pizza sizes: for small 5 to 7, for medium 8 to 10, and for large 11 to 13. The price ranges on pizza are between 12.50 to 32.00.
2. Create a second function that calculates the area of a pizza and price per inch.
3. Create the last function that displays results as follows: Welcome to the Frugal Pizza Calculator. Enter diameter of a small pizza (in inches): 6 Enter the price of a small pizza: $12.90 Enter diameter of a medium pizza (in inches): 9 Enter the price of a medium pizza: $13.40 Enter diameter of a large pizza (in inches): 12 Enter the price of a large pizza: $27.90 Small pizza Diameter = 6 inches Price = $ 12.90 Per square inch = $0.46 Medium pizza Diameter = 9 inches Price = $13.40 Per square inch = $0.21 Large pizza Diameter = 12 inches Price = $27.90 Per square inch = $0.25 The medium one is the better buy.

This is my code so far. I haven't started part 3 yet, could someone please review my code and let me know if I'm on the right track?

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#include <iostream>
using namespace std;

const double PI = 3.14;

void userInputSize(double&, double&, double&);
void userInputPrice(double&, double&, double&);
double calculateRadious(double&, double&, double&);
double calculateArea(double&, double&, double&);
double calculatePrice(double&, double&, double&);

int main(){
	
	cout << "Enter the size and the price of the pizza" << endl;
	cout << " Small Pizza varies between 5 to 7 inches " << endl;
	cout << " Medium pizza varies between 8 to 10 inches " << endl;
	cout << " Large pizza varies between 11 to 13 inches " << endl;

	double sSize,
		mSize,
		lSize,
		sPrice,
		mPrice,
		lPrice;
	userInputSize(sSize, mSize, lSize);
	cout << " Small pizza costs $12.90" << endl;
	cout << " Medium pizza costs $13.40" << endl;
	cout << " Large pizza costs $27.90" << endl;
	userInputPrice(sPrice, mPrice, lPrice);

	//calculateRadious- Will calculate the Radious of the Pizza
	double sRadious=0.00,
		mRadious=0.00,
		lRadious=0.00;
	calculateRadious(sRadious, mRadious, lRadious);

	sRadious = (sSize / 2);
	mRadious = (mSize / 2);
	lRadious = (lSize / 2);
	
	//calculateArea- Will calculate the area of the Pizza
	double sArea,
		mArea,
		lArea;

	calculateArea(sArea, mArea, lArea);
	sArea = (PI* sRadious) * 2;
	mArea = (PI * mRadious) * 2;
	lRadious = (PI * lRadious) * 2;
	cout << " Area of a small pizza = " << sArea << endl;
	cout << " Area of a medioum size pizza = " << mArea << endl;
	cout << " Area of the large pizza = " << lArea << endl;

	//calculatePrice- Will calculate the price per inch
	double sPerInch,
		mPerInch,
		lPerInch;

	calculatePrice(sPerInch, mPerInch, lPerInch);
	sPerInch = (sSize / sPrice);
	mPerInch = (mSize / mPrice);
	lPerInch = (lSize / lPrice);

	cout << " Per per inch of the small Pizza = " << sPerInch << endl;
	cout << " Per per inch of the medium Pizza = " << mPerInch << endl;
	cout << " Per per inch of the large Pizza = " << lPerInch << endl;

	
	system("pause");
	return 0;
}
void userInputSize(double&small, double& medium, double& large){

	do {
		cout << "Enter the size of the small pizza (in inches):" << endl;
		cin >> small;
		cout << "Enter the size of the medium pizza (in inches):" << endl;
		cin >> medium;
		cout << "Enter the size of the large pizza (in inches):" << endl;
		cin >> large;
	} while ((!(small >= 5) || !(small <= 7)) && (!(medium >= 8) || !(medium <= 10)) && (!(large >= 11) || !(large <= 13)));

}

void userInputPrice(double&smallp, double&mediump, double&largep){

	do{
		cout << "Enter the price of the small pizza" << endl;
		cin >> smallp;
		cout << "Enter the price of the medium pizza" << endl;
		cin >> mediump;
		cout << "Enter the price of the large pizza" << endl;
		cin >> largep;
	} while (!(smallp == 12.90) && !(mediump == 13.40) && !(largep == 27.80));
}

double calculateRadious(double& sRadious, double& mRadious, double& lRadious){

	return (sRadious, mRadious, lRadious);
}



double calculateArea(double& sArea, double& mArea, double& lArea){

	return (sArea, mArea, lArea);
}

double calculatePrice(double& sPrice, double& mPrice, double& lPrice){

	return (sPrice, mPrice, lPrice);
}
TarikNeaj (2580)
So We meet again OP.

I ran this program and only had one problem. The Area of the large pizza. You never do the calculations for it, so it prints out junk.

cout << " Area of the large pizza = " << lArea << endl;

Another thing. Whats Per Per inch?

[code]cout << " Per per inch of the small Pizza = " << sPerInch << endl;
cout << " Per per inch of the medium Pizza = " << mPerInch << endl;
cout << " Per per inch of the large Pizza = " << lPerInch << endl;[/code

Edit: Im assuming your 3 calculate functions at the end is part of part 3, because they dont do anything atm.

Last edited on
khatereh (41)
Yes:)
for Area of Large Pizza I believe I should use set precision.

For the other thing, it should be Price per inch, haha. I fixed that too.

Thank you,
khatereh (41)
I think there is a problem in my program, I need to do all the calculations inside my function definition, however, when I do that, I get 0 for all my calculation since all my variables has been initialized to 0. I'm not sure how to fix the issue.
Here is my code:

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#include <iostream>
using namespace std;

const double PI = 3.14;

//Function Decleration
void userInputSize(double&, double&, double&);
//
void userInputPrice(double&, double&, double&);
double calculateRadious(double&, double&, double&);
double calculateArea(double&, double&, double&);
double calculatePrice(double&, double&, double&);
//CalculateBestDeal- Prints the size and price of the pizza
void calculateBestDeal(double, double);

int main(){
	
	cout << "Enter the size and the price of the pizza" << endl;
	cout << " Small Pizza varies between 5 to 7 inches " << endl;
	cout << " Medium pizza varies between 8 to 10 inches " << endl;
	cout << " Large pizza varies between 11 to 13 inches " << endl;

	double sSize,
		mSize,
		lSize,
		sPrice,
		mPrice,
		lPrice;
	userInputSize(sSize, mSize, lSize);
	cout << " Small pizza costs $12.90" << endl;
	cout << " Medium pizza costs $13.40" << endl;
	cout << " Large pizza costs $27.90" << endl;
	userInputPrice(sPrice, mPrice, lPrice);

	//calculateRadious- Will calculate the Radious of the Pizza
	double sRadious=0.00,
		mRadious=0.00,
		lRadious=0.00;
	calculateRadious(sRadious, mRadious, lRadious);
	
	//calculateArea- Will calculate the area of the Pizza
	double sArea,
		mArea,
		lArea;

	calculateArea(sArea, mArea, lArea);

	//calculatePrice- Will calculate the price per inch
	double sPerInch,
		mPerInch,
		lPerInch;

	calculatePrice(sPerInch, mPerInch, lPerInch);

	//Calculate the best size and best price of the pizza
	double bestPizzaSize=0.00,
		bestPizzaPrice=0.00;
	calculateBestDeal(bestPizzaSize, bestPizzaPrice);
	
	system("pause");
	return 0;
}
void userInputSize(double&small, double& medium, double& large){

	do {
		cout << "Enter the size of the small pizza (in inches):" << endl;
		cin >> small;
		cout << "Enter the size of the medium pizza (in inches):" << endl;
		cin >> medium;
		cout << "Enter the size of the large pizza (in inches):" << endl;
		cin >> large;
	} while ((!(small >= 5) || !(small <= 7)) && (!(medium >= 8) || !(medium <= 10)) && (!(large >= 11) || !(large <= 13)));

}

void userInputPrice(double&smallp, double&mediump, double&largep){

	do{
		cout << "Enter the price of the small pizza" << endl;
		cin >> smallp;
		cout << "Enter the price of the medium pizza" << endl;
		cin >> mediump;
		cout << "Enter the price of the large pizza" << endl;
		cin >> largep;
	} while (!(smallp == 12.90) && !(mediump == 13.40) && !(largep == 27.80));
}

double calculateRadious(double& newsRadious, double& newmRadious, double& newlRadious){
	double sSize=0.00,
		mSize=0.00,
		lSize=0.00;
	newsRadious = (sSize / 2);
	newmRadious = (mSize / 2);
	newlRadious = (lSize / 2);
	return (newsRadious, newmRadious, newlRadious);
}



double calculateArea(double& newsArea, double& newmArea, double& newlArea){

	double newsRadious=0.00,
		newmRadious=0.00,
		newlRadious=0.00;
	newsArea = (PI* newsRadious) * 2;
	newmArea = (PI * newmRadious) * 2;
	newlRadious = (PI * newlRadious) * 2;
	cout << " Area of a small pizza = " << newsArea << endl;
	cout << " Area of a medioum size pizza = " << newmArea << endl;
	cout << " Area of the large pizza = " << newlArea << endl;

	return (newsArea, newmArea, newlArea);
}

double calculatePrice(double& sPrice, double& mPrice, double& lPrice){

	double sPerInch=0.00,
		mPerInch=0.00,
		lPerInch=0.00,
		sSize=0.00,
		mSize=0.00,
		lSize=0.00;
	
	sPerInch = (sSize / sPrice);
	mPerInch = (mSize / mPrice);
	lPerInch = (lSize / lPrice);

	cout << " Price per inch of the small Pizza = " << sPerInch << endl;
	cout << " Price per inch of the medium Pizza = " << mPerInch << endl;
	cout << " Price per inch of the large Pizza = " << lPerInch << endl;

	return (sPrice, mPrice, lPrice);
}

void calculateBestDeal(double bestSize, double bestPrice){

	double sSize=0.00,
		mSize=0.00,
		lSize=0.00,
		sPrice=0.00,
		mPrice=0.00,
		lPrice=0.00,
		sPerInch=0.00,
		mPerInch=0.00,
		lPerInch=0.00;

	cout << " Enter diameter of a small pizza (in inches): " << sSize << endl;
	cout << " Enter the price of small pizza " << sPrice << endl;
	cout << " Enter diameter of a medium pizza (in inches): " << mSize << endl;
	cout << " Enter the price of medium pizza " << mPrice << endl;
	cout << " Enter diameter of a large pizza (in inches): " << lSize << endl;
	cout << " Enter the price of large pizza " << lPrice << endl;
	cout << " Small Pizza Diameter = " << sSize << " inches" " Price = " << sPrice << " Per square Inch = " << sPerInch << endl;
	cout << " Medium Pizza Diameter = " << mSize << " inches" " Price = " << mPrice << " Per square Inch = " << mPerInch << endl;
	cout << " Large Pizza Diameter = " << lSize << " inches" " Price = " << lPrice << " Per square Inch = " << lPerInch << endl;

}
EdevanX (5)
1.- I think there is a problem in my program, I need to do all the calculations inside my function definition, however, when I do that, I get 0 for all my calculation since all my variables has been initialized to 0. I'm not sure how to fix the issue.

_____________________________________________________________________
why u dont use pointers in ur functions, example:

userInputSize(double *sSize,double * mSize,double * lSize);

_____________________________________________________________________
2.- Is that ok?

sPerInch = (sSize / sPrice);
mPerInch = (mSize / mPrice);
lPerInch = (lSize / lPrice);

isnt like this:

sPerInch = (sPrice / sSize);
______________________________________________________________________

3.- Why this?

while ((!(small >= 5) || !(small <= 7)) && (!(medium >= 8) || !(medium <= 10)) && (!(large >= 11) || !(large <= 13)));

what will happend if u input 9 in the small, 10 in the medium, and 15 in the large?

why not?

while((small!=6)||( medium != 9)||(large != 12))
_____________________________________________________________________

4.- Im not sure of the area :
newsArea = (PI* newsRadious) * 2;

isnt:

newsArea = PI* (newsRadious *newsRadious) ;

____________________________________________________________

5.- And for the end:


Im not sure about this one but isnt suppuse the function display(), do all the thing u are doing in main()?;

____________________________________________________________

Im not sure if im right but good luck, and remember u can use arrays and the for loop;






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