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A step-by-step guide on how to create a C program that reads strings from the keyboard, writes them to a file with a specific format, and handles user input effectively.
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This video is based on the question https://stackoverflow.com/q/64061708/ asked by the user 'Marcus Abrate' ( https://stackoverflow.com/u/13757460/ ) and on the answer https://stackoverflow.com/a/64062403/ provided by the user 'Filip Emanuel Drexler' ( https://stackoverflow.com/u/14037022/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Read Strings from Keyboard and Write Them to a File in C

In this guide, we will explore a common programming task in C: Reading strings from the keyboard and writing them to a file. This task might seem straightforward, but it comes with some challenges, especially when dealing with dynamic memory allocation and user input.

The Problem Explained

You are required to write a C program that:

Reads strings from user input through the keyboard.

Writes those strings to a file in a specific format:

Each string should be preceded by its length and a colon (:).

The program should stop taking input when the user types a single dot (.) on a new line.

Example Input and Output

When the user enters:

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

The program writes to the file:

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

However, many learners face difficulties such as:

Not writing the actual string to the file.

Failing to exit the program when the user inputs a dot (.).

Solution Breakdown

Let’s break down the solution into organized sections for clarity.

1. Setting Up the Environment

Start by including necessary libraries that will help in managing input/output operations and memory:

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

2. Memory Allocation

To store user input of arbitrary length, we use dynamic memory allocation:

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

3. Checking for Errors

It is crucial to check whether memory allocation was successful as well as whether the file opened successfully:

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

4. Loop for Input

Set up a loop that continues to accept input and writes it to the file until the user inputs a dot:

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

5. Clean Up

After the input process is complete, make sure to free any dynamically allocated memory and close the file correctly:

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

Complete Program Code

Here is the complete program that encompasses all the steps we discussed:

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

Conclusion

In conclusion, we have reviewed how to develop a C program that effectively reads strings from keyboard input and writes them to a file in a specified format. Once you understand the structure and flow of the program, it becomes a straightforward task to manage memory and file operations in C. Happy coding!