Which is used to open “file.bin” for reading binary data in C?

Question

BlackTom AI · Accepted Answer

The correct function and mode are fopen and "rb": fopen("file.bin", "rb").

1) Relevant concepts:
- The C standard library uses fopen to open files: FILE *fopen(const char *pathname, const char *mode).
- The mode string specifies read/write and text/binary behavior. "r" means open for reading; adding "b" ("rb") requests binary mode. On Windows, binary mode prevents CR-LF translation; on POSIX the "b" is ignored but accepted for portability.
- There is no standard C function named bopen.

2) Step-by-step reasoning:
- Step 1: We need a standard file-opening function → fopen is the correct standard function.
- Step 2: We need to read binary data → choose a mode that indicates reading and binary: "rb".
- Step 3: Combine function and mode → fopen("file.bin", "rb") returns a FILE* for reading binary data or NULL on failure.

3) Intermediate steps / details:
- Prototype: FILE *fp = fopen("file.bin", "rb");
- Check result: if (fp == NULL) handle error (e.g., perror, exit).
- When done: fclose(fp).

4) Why this is correct:
- fopen is standardized and accepts a two-character mode string where "r" is read and "b" denotes binary. Using "rb" ensures correct behavior for binary data and portability across platforms.

5) Why the other options are incorrect:
- bopen("file.bin", "r"): bopen is not a standard C library function.
- bopen("file.bin", "r,binary"): mode strings must be a single string like "rb"; "r,binary" is invalid and bopen doesn't exist.
- bopen("file.bin", "r", "binary"): incorrect function name and wrong argument pattern; fopen takes a single mode string, not separate "r" and "binary".

6) Conclusion:
fopen("file.bin", "rb") is the correct choice and matches the provided answer.

Which is used to open “file.bin” for reading binary data in C?单项选择题

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