Question

Part 1: Pizza Price Calculator

Size	S (10")	M(13")	L(16")
Base Price	$6.99	$9.99	$12.99
Each Topping	$0.70	$1.00	$1.50

Develop a C++ program that reads in the size of a pizza (S,M, or L) and the number of toppings, and then outputs the total price of the pizza on the screen. The price must be calculated based on the table above. For example, when a customer orders a pizza of size 'M' with three toppings, the total price is $9.99 + $1.00 x 3 = $12.99. The maximum number of toppings for one pizza is 5.

• Use three functions: one for input, one calculating, and one for output.
  • pizzaOrder: gets the size and the number of toppings.
    • Use call-by-reference to return two values back to main function.
    • The size must be a character, S, M, or L.
      • If user inputs characters other than S, M, or L, the program should prompt to input it again.
    • The number of toppings ranges 0 to 5.
      • If user inputs values out of the range, the program should prompt to input it again.
  • calculatePizzaPrice: calculate the total price of the pizza.
    • The price must be calculated based on the table above.
  • displayPizzaPrice: outputs the total price , size of the number of toppings on the screen.
    • Amounts in dollar should be formatted; show 2 digits of fraction part to represent the cent, like $12.99.
  • State 'precondition' and 'postcondition' for each function in comment lines.
  • Your functions should work with main function below.
• Include a loop that lets the user repeat this computation for new input values until the user wishes to end the program.
  • This is implemented already. But you have to define askYesNo function. See below.
• Declare variables to express all constant values used in the code with the modifier const. And use them in your code.
• Use an appropriate data type for each variable and function.
• Hint : see Supermarket Pricing code here.

• State your name in a comment line.

int main(int argc, const char * argv[]) {
    do{
        // get a pizza order
        char pizzaSize;
        int numberOfToppings;
        pizzaOrder(pizzaSize,numberOfToppings);

        // calculate the price
        double pizzaPrice = calculatePizzaPrice(pizzaSize,numberOfToppings);
        
        // print the price
        displayPizzaPrice(pizzaSize,numberOfToppings,pizzaPrice);
        
        std::cout << "Repeat? [Y/N]";
    }while(askYesNo());
    
    std::cout << "Bye\n";
    return 0;
}

in C ++

Answer 1

The program uses three functions

• pizzaOrder - to get input
• calculatePizzaPrice- calculates the pizza price based on the slab given
• displaypizzaprice- displays the pizza size, number of toppings and prize
• setprecision has been used to print the price with 2 decimal points.
• both upper and lower case of letters of 's' or 'S', 'm' or 'M', 'l' or 'L' is accepted in this code.
• To repeat the input letter 'y' or 'Y' should be given. if not the program quits.

Comments are given in the code

code:

#include<iostream>
#include<ctype.h>
#include<iomanip>
// pizzaOrder() get pizzaSize and number of Toppings as input from the user.
/*The size must be a character, S, M, or L.
If user inputs characters other than S, M, or L, the function should prompt to input it again.
The number of toppings ranges 0 to 5.
If user inputs values out of the range, the function should prompt to input it again.*/
void pizzaOrder(char* pizzaSize, int* n)
{
bool t = 1;
while (t)
{
t = 0;
std::cout << "\nEnter Pizza Size(S/M/L)-S-10inch,M-13inch and L-16inch :";
std::cin >> *pizzaSize;
if (toupper(*pizzaSize) != 'S' && toupper(*pizzaSize) != 'M' && toupper(*pizzaSize) != 'L')
{
std::cout << "\n Enter Valid Input";
t = 1;
continue;
}
}
t = 1;
while (t)
{
t = 0;
std::cout << "\n Enter Number of Toppings : ";
std::cin >> *n;
if (*n < 0 || *n>5)
{
std::cout << "\n Enter Valid Input";
t = 1;
continue;
}
}
}
/* alculate the total price of the pizza.
The price must be calculated based on the values given in the problem.
All the values should be declared as constant using const.
*/
double calculatePizzaPrice(char pizzaSize, int n)
{
const float sPrice = 6.99;
const float mPrice = 9.99;
const float lPrice = 12.99;
const float sTop = .70;
const float mTop = 1.00;
const float lTop = 1.50;
float pizPrice=0, topPrice=0;
if (toupper(pizzaSize) == 'S')
{
pizPrice = sPrice;
topPrice =n * sTop;
}
else if (toupper(pizzaSize) == 'M')
{
pizPrice = mPrice;
topPrice = n * mTop;
}
else if (toupper(pizzaSize) == 'L')
{
pizPrice = lPrice;
topPrice = n * lTop;std::cout << "topPrice: " << topPrice;
}
double price = pizPrice + topPrice;
  
return price;
}
/*outputs the total price , size of the number of toppings on the screen.
Amounts in dollar should be formatted; show 2 digits of fraction part to represent the cent, like $12.99.*/
void displayPizzaPrice(char pizzaSize, int n, double price)
{
std::cout << "\n Pizza Size : " << pizzaSize;
std::cout << "\n Toppings : " << n;
std::cout << "\n Pizza Price : $" << std::setprecision(4) << price;
}
bool askYesNo()
{
char ans;
std::cin >> ans;
if (toupper(ans) == 'Y')
return true;
else
return false;
}
// Main method
int main(int argc, const char* argv[])
{
do {
// get a pizza order
char pizzaSize;
int numberOfToppings;
pizzaOrder(&pizzaSize, &numberOfToppings);

// calculate the price
double pizzaPrice = calculatePizzaPrice(pizzaSize, numberOfToppings);

// print the price
displayPizzaPrice(pizzaSize, numberOfToppings, pizzaPrice);

std::cout << "\n Repeat? [Y/N]";
} while (askYesNo());

std::cout << "Bye\n";
return 0;
}

Screenshot

pizzaOrder()

calculatePizzaPrice()

dispalyPizzaPrice()

main()

Output 1:

Output 2:

As mentioned in the description of the problem state your name as comment.