Easy to create a file in C program.

Posted on: October 1, 2024 in C programme ,

To create a file in C programming language, you typically use file handling functions such as fopen(), fprintf(), fclose(), etc. Here’s a simple example that creates a text file and writes some data into it:

Example: Writing to a File in C

c

#include <stdio.h>

int main() {
    // File pointer
    FILE *filePointer;
    
    // Open a file in write mode
    filePointer = fopen("example.txt", "w");
    
    // Check if the file was opened successfully
    if (filePointer == NULL) {
        printf("Error opening file!\n");
        return 1;
    }
    
    // Writing data to the file
    fprintf(filePointer, "This is an example of writing to a file in C.\n");
    fprintf(filePointer, "File handling in C is useful!\n");
    
    // Close the file
    fclose(filePointer);
    
    printf("Data written to the file successfully.\n");

    return 0;
}

Key Functions:

fopen("filename", "mode"): Opens a file in the specified mode. Modes include:
- "w": Write mode (creates a new file if it doesn’t exist or truncates the existing file).
- "r": Read mode (opens an existing file for reading).
- "a": Append mode (opens a file for appending data to the end).
fprintf(): Writes formatted data to the file.
fclose(): Closes the file and ensures that the data is written.

Output:

This program will create a file named example.txt and write two lines into it. If you open the file after running the program, you will see the following content:

c

This is an example of writing to a file in C.
File handling in C is useful!

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Easy to create a file in C program.

Example: Writing to a File in C

c

Key Functions:

Output:

c

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