What is the role of the fopen() function in C?
a) To open a file for reading or writing
b) To close a file
c) To write data to a file
d) To delete a file
Answer:
a) To open a file for reading or writing
Explanation:
The fopen() function in C is used to open a file for reading, writing, or both. It returns a pointer to a FILE object, which is then used by other file handling functions like fread(), fwrite(), and fclose(). The fopen() function requires two arguments: the name of the file and the mode (e.g., “r” for reading, “w” for writing, “a” for appending).
If the file cannot be opened, fopen() returns NULL, indicating that the file operation failed. Proper handling of this return value is essential to avoid errors and ensure that the program can handle file-related issues gracefully.