Скачать или смотреть How to Remove the Lowest Grade and Calculate the Average in C+ +

Discover how to fix your C+ + code to effectively remove the lowest grade before calculating the average score with our step-by-step guide.
---
This video is based on the question https://stackoverflow.com/q/73862289/ asked by the user 'Damien Torres' ( https://stackoverflow.com/u/20096518/ ) and on the answer https://stackoverflow.com/a/73862372/ provided by the user 'wohlstad' ( https://stackoverflow.com/u/18519921/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: Removing lowest grade and averaging. C+ + , VS

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Introduction: The Problem of Averaging Grades

Many students and programmers face the challenge of calculating an average score while excluding the lowest grade. This can be essential in scenarios such as academic settings, where a student's performance is assessed without bias from their weakest result. In this guide, we'll look at a real-world example where a student needed help with their C+ + code to remove the lowest grade before calculating the average. Specifically, they were handling a series of grades but were confused about why their calculations were yielding incorrect results.

The Task at Hand

In our example, the grades provided were as follows:

96, 86, 88, 95, 88, 92, 77, 80, 95, 64, 100, 94.

The goal was to remove the lowest grade (64) and then calculate the average of the remaining grades correctly. The expected average was 90.09, but the output of the provided C+ + code was 92.4.

Understanding the Code

Here’s the C+ + code provided by the user with the key structures identified:

[[See Video to Reveal this Text or Code Snippet]]

Key Points of the Code:

File handling: The ifstream fin; line initializes a file input stream.

Score Input: The while (fin >> score) loop reads scores until the end of the file.

Calculations: It calculates the total score and identifies the minimum score to exclude later.

Identifying the Problem

Upon review, the following line caught attention:

[[See Video to Reveal this Text or Code Snippet]]

This line was accidentally placed after counting scores. Here’s what went wrong:

The while(fin >> score) loop reads a score from the file.

Immediately after, another fin >> score was used which caused the previous value stored in score to be overwritten.

Consequence:

This caused the algorithm to skip certain scores (1st, 3rd, 5th, etc.), leading to an incorrect average calculation.

The Solution: Simplifying the Code

To resolve this issue, simply remove the second reading of the score. Here’s the modified code:

[[See Video to Reveal this Text or Code Snippet]]

After Adjustments

Remove the line that reads fin >> score; again.

Ensure the total score and min score calculations utilize the score read during the loop correctly without skipping any values.

Conclusion: Putting It All Together

By tweaking your code snippet to only read the score once in the reading loop, your program will properly take into account all the grades. This adjustment will help you find the correct average of 90.09 after excluding the lowest grade of 64, aligning with your expectations.

Final Thoughts

If you're struggling with grade calculations in C+ + or any other programming task, ensure that you are not inadvertently neglecting values in your logic. Always test small segments of code to confirm their accuracy. Happy coding!