Why file handling is required in C - See It in Action

Why file handling is required

📖 Scenario: Imagine you are writing a simple program that needs to save and read data even after the program stops running. This is like writing notes on paper instead of just remembering them in your head.

🎯 Goal: You will create a small C program that writes a message to a file and then reads it back. This will show why file handling is important: to keep data safe and use it later.

📋 What You'll Learn

Create a file pointer variable

Open a file named example.txt for writing

Write the exact text "Hello, file handling!" to the file

Close the file after writing

Open the same file for reading

Read the text from the file into a character array

Print the read text to the screen

💡 Why This Matters

🌍 Real World

Saving user data, logs, or settings in files is common in many programs and apps.

💼 Career

Understanding file handling is essential for software developers to manage data storage and retrieval.

1

Create a file pointer and open a file for writing

Create a file pointer variable called file and open a file named example.txt in write mode using fopen.

C

#include 

int main() {
    FILE *file = fopen("example.txt", "w");
    // Your code here
    return 0;
}

Need a hint?

Use FILE *file to declare the file pointer and fopen("example.txt", "w") to open the file for writing.

2

Write text to the file and close it

Use fprintf to write the exact text "Hello, file handling!" to the file pointer file. Then close the file using fclose.

C

#include 

int main() {
    FILE *file = fopen("example.txt", "w");
    fprintf(file, "Hello, file handling!");
    fclose(file);
    // Your code here
    return 0;
}

Need a hint?

Use fprintf(file, "Hello, file handling!") to write and fclose(file) to close the file.

3

Open the file for reading and read the text

Open the file example.txt in read mode using fopen with the file pointer file. Create a character array buffer of size 50. Use fgets to read the text from the file into buffer. Then close the file.

C

#include 

int main() {
    FILE *file = fopen("example.txt", "w");
    fprintf(file, "Hello, file handling!");
    fclose(file);

    file = fopen("example.txt", "r");
    char buffer[50];
    fgets(buffer, 50, file);
    fclose(file);
    // Your code here
    return 0;
}

Need a hint?

Use fopen("example.txt", "r") to open for reading, char buffer[50] to create storage, and fgets(buffer, 50, file) to read the text.

4

Print the read text to the screen

Use printf to print the content of the character array buffer to the screen.

C

#include 

int main() {
    FILE *file = fopen("example.txt", "w");
    fprintf(file, "Hello, file handling!");
    fclose(file);

    file = fopen("example.txt", "r");
    char buffer[50];
    fgets(buffer, 50, file);
    fclose(file);

    printf("%s", buffer);
    // Your code here
    return 0;
}

Need a hint?

Use printf("%s", buffer) to show the text read from the file.