🔹 File Pointers in C

🧵 Use of File Pointers in C

In C, a file pointer is a pointer to a FILE object that represents a file stream. It is used to read, write, and manage files efficiently.

🔹 Declaring a File Pointer

FILE *fp;

🔹 Opening and Closing a File

#include <stdio.h>

int main() {
    FILE *fp;

    fp = fopen("example.txt", "w");
    if (fp == NULL) {
        printf("Error opening file.\n");
        return 1;
    }

    fprintf(fp, "Hello, File Pointer!\n");
    fclose(fp);

    return 0;
}

🔹 Common File Pointer Functions

Function	Purpose
fopen()	Open a file and get file pointer
fclose()	Close the file
fprintf()	Write formatted output to file
fscanf()	Read formatted input from file
fseek()	Move file pointer position
ftell()	Get current position of file pointer
rewind()	Reset file pointer to beginning

🔹 Example: Using fseek() and ftell()

#include <stdio.h>

int main() {
    FILE *fp = fopen("example.txt", "r");
    if (fp == NULL) {
        printf("Cannot open file.\n");
        return 1;
    }

    fseek(fp, 5, SEEK_SET);  // Move pointer 5 bytes from beginning
    printf("Current position: %ld\n", ftell(fp));

    fclose(fp);
    return 0;
}

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