FILE* fptr = fopen("test", "r"); if (__ (fptr)) { printf("End of file reached"). (42); }

Explanation of the Code

The given code snippet is written in the C programming language and performs the following steps:

1. The code declares a pointer variable fptr of type FILE*.
2. The fopen() function is called to open a file named "test" in read mode. The function returns a pointer to the opened file, which is assigned to the fptr variable.
3. The code checks if the value of fptr is not equal to NULL using the __ operator.
4. If the condition is true (i.e., the file was successfully opened), the code prints the message "End of file reached" using the printf() function.
5. Finally, the code returns the value 42.

Please note that the __ operator is not a valid operator in the C programming language. It seems to be a placeholder in the given code snippet.

Here is the modified code without the placeholder operator:

#include <stdio.h>

int main() {
    FILE* fptr = fopen("test", "r");
    if (fptr != NULL) {
        printf("End of file reached");
    }
    return 42;
}

This code snippet opens a file named "test" in read mode and checks if the file was successfully opened. If it was, it prints "End of file reached" and returns the value 42.

Please let me know if you need further assistance!