Write a program to open a file using fopen()

#include<stdio.h>

 void main()
{
fopen()
file *fp;
fp=fopen(“student.DAT”, “r”);
if(fp==NULL)
{
printf(“The file could not be open”);
exit(0);
}

#include <stdio.h>
#include <stdlib.h>

#include <stdio.h>: Includes the Standard Input Output library, which is essential for functions like printf, fopen, and fclose.
#include <stdlib.h>: Includes the Standard Library, which is necessary for using the exit function.

int main() {

Defines the main function where the program execution starts. (Note: It’s best to use int main() instead of void main() for standard compliance.)

FILE *fp;  // Declare a file pointer

A file pointer fp is declared. This pointer will be used to manage the file operations.

fp = fopen("student.DAT", "r");

The fopen function is used to open the file named student.DAT in read mode ("r"). This means the program will attempt to read data from this file.

if (fp == NULL) {
    printf("The file could not be opened\n");
    exit(0);
}

This checks whether the file was opened successfully. If fp is NULL, it indicates an error (e.g., the file does not exist or cannot be accessed).
If the file cannot be opened, it prints an error message and exits the program with exit(0).

This comment indicates where you can add code to read data from the file if it opened successfully.

fclose(fp);

This closes the file once all necessary operations are complete. It’s essential to free up resources by closing files you open.

return 0;

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