Writing to a File

#include <stdio.h>

int main() {
    // Declare a file pointer
    FILE *filePtr;

    // Open a file in write mode ("w")
    filePtr = fopen("sample.txt", "w");

    // Check if the file opened successfully
    if (filePtr == NULL) {
        printf("Error! Could not open file.\n");
        return 1;
    }

    // Write data to the file
    fprintf(filePtr, "Hello, File Handling in C!\n");
    fprintf(filePtr, "This is an example of writing to a file.\n");

    // Close the file
    fclose(filePtr);

    printf("Data written to the file successfully.\n");

    return 0;
}

This program writes some text to a file named sample.txt. If the file doesn’t exist, it will be created. If it exists, its contents will be overwritten.

Explanation:

FILE *filePtr: This is the file pointer that points to the file.
fopen("sample.txt", "w"): Opens the file in write mode. If the file doesn’t exist, it is created.
fprintf(): Writes formatted text to the file, just like printf() outputs to the console.
fclose(): Closes the file after the operation is done to release the resources.

Problem Solving using C Language

File Handling

Writing to a File

Explanation: