fopen fwrite

`fopen` and `fwrite` are functions used in the C programming language to open a file and write data to it, respectively.

The `fopen` function is used to open a file and obtain a file pointer that can be used for subsequent file operations. Its syntax is:

FILE *fopen(const char *filename, const char *mode);

Here, `filename` is a string that specifies the name of the file to be opened, and `mode` is a string that specifies the mode in which the file will be opened (e.g., `"r"` for reading, `"w"` for writing, `"a"` for appending). The return value of `fopen` is a pointer to a `FILE` object, which represents the opened file. If the file cannot be opened, `NULL` is returned.

The `fwrite` function is used to write data to a file. Its syntax is:

size_t fwrite(const void *ptr, size_t size, size_t count, FILE *stream);

Here, `ptr` is a pointer to the memory block containing the data to be written, `size` specifies the size of each element to be written, `count` specifies the number of elements to be written, and `stream` is a pointer to a `FILE` object that represents the file being written to. The return value of `fwrite` is the total number of elements successfully written.

These functions are commonly used for file input/output operations in C. Let me know if you have any specific questions or if there's anything else I can assist you with!