Pizza Program With Percentage Calculation In C++ ✓ Solved

Pizza Program with Percentages Calculation in C++

The provided code is a simple C++ program that calculates the percentage of different sizes of pizzas sold. The program begins by including necessary header files and using the `std` namespace. It initializes variables to store the number of pizzas of each size, as well as the total sold and the percentages. The program prompts the user for input on how many small, medium, large, and family pizzas were sold.

Here is a detailed breakdown of how each part of the program works:

Header Files

The `#include ` directive allows the program to use input and output streams. Meanwhile, `#include ` is included for setting the precision of displayed numbers. These are essential for reading user input and displaying formatted output.

Variable Initialization

In the `main()` function, the program initializes several integer variables: `numSmall`, `numMedium`, `numLarge`, and `numFamily`, which will hold the counts of different pizza sizes sold. It also initializes `totalSold` to hold the total number of pizzas sold and four double variables (`pctSmall`, `pctMedium`, `pctLarge`, and `pctFamily`) to store the calculated percentages of each size.

User Input

The program prompts the user with a series of questions using `cout`. It asks for the number of small, medium, large, and family pizzas sold, which it assigns to their respective variables using `cin`. The code snippet below demonstrates how user input is gathered:

cout 
cin >> numSmall; 
cout 
cin >> numMedium; 
cout 
cin >> numLarge; 
cout 
cin >> numFamily; 

Calculating Total and Percentages

After collecting the data, the program calculates the `totalSold` by summing all variants of pizzas. It then calculates the percentages for each pizza size using the formula of the respective size divided by the total count.

totalSold = (numSmall + numMedium + numLarge + numFamily);
pctSmall = ((float)numSmall / totalSold);
pctMedium = ((float)numMedium / totalSold);
pctLarge = ((float)numLarge / totalSold);
pctFamily = ((float)numFamily / totalSold);

Displaying Results

Finally, the program formats the output to display the percentages to two decimal places using `setprecision(2)`. It then prints the percentages of each pizza size sold. The output code is structured as follows:

cout 
cout 
cout 
cout 
cout 

System Pause

The program then calls `system("pause")` to prevent the console window from closing immediately after the output is displayed. This allows users to view the results until they choose to close the program manually.

Conclusion

This C++ program is a valuable example of handling user input, performing arithmetic operations to calculate percentages, and displaying results. It demonstrates basic structure and functionality that can serve as a foundation for more complex applications, particularly in a point-of-sale system for a pizzeria or similar businesses.

Next Steps

Enhancements such as error handling (for invalid input) and a more sophisticated UI could be developed to make this program more robust and user-friendly. Additionally, expanding the program to handle different pizza types or additional products could provide more comprehensive sales data.

References

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• Effective C++: 55 Specific Ways to Improve Your Programs and Designs (3rd ed.). (2005). Addison-Wesley.
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