Class 6 Exam > Class 6 Questions > What will the given C code do?int memcmp(cons...
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What will the given C code do?
int memcmp(const void *str1, const void *str2, size_t n)
- a)compares the first n bytes of str1 and str2
- b)copies the first n bytes of str1 to str2
- c)copies the first n bytes of str2 to str1
- d)invalid function
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
What will the given C code do?int memcmp(const void *str1, const void ...
Understanding the Function: memcmp
The `memcmp` function is a standard library function in C used for comparing blocks of memory.
Function Prototype
- The function is defined as:
c
int memcmp(const void *str1, const void *str2, size_t n);
Purpose of memcmp
- The primary purpose of `memcmp` is to compare the first n bytes of two memory areas pointed to by `str1` and `str2`.
How it Works
- The function examines each byte in the two memory areas:
- If the bytes are equal, it continues checking the next byte.
- If a difference is found, the function returns:
- A negative value if `str1` is less than `str2`
- A positive value if `str1` is greater than `str2`
- If all compared bytes are equal, it returns zero.
Key Points
- Comparison: The function does not modify the memory blocks; it solely compares their contents.
- Parameters:
- `str1` and `str2`: Pointers to the memory areas to be compared.
- `n`: The number of bytes to compare.
- Return Value:
- Zero if the blocks are equal
- Non-zero value if they differ
Conclusion
- Hence, the correct answer to what `memcmp` does is option 'A', as it accurately describes the function's role in comparing memory contents.
The `memcmp` function is a standard library function in C used for comparing blocks of memory.
Function Prototype
- The function is defined as:
c
int memcmp(const void *str1, const void *str2, size_t n);
Purpose of memcmp
- The primary purpose of `memcmp` is to compare the first n bytes of two memory areas pointed to by `str1` and `str2`.
How it Works
- The function examines each byte in the two memory areas:
- If the bytes are equal, it continues checking the next byte.
- If a difference is found, the function returns:
- A negative value if `str1` is less than `str2`
- A positive value if `str1` is greater than `str2`
- If all compared bytes are equal, it returns zero.
Key Points
- Comparison: The function does not modify the memory blocks; it solely compares their contents.
- Parameters:
- `str1` and `str2`: Pointers to the memory areas to be compared.
- `n`: The number of bytes to compare.
- Return Value:
- Zero if the blocks are equal
- Non-zero value if they differ
Conclusion
- Hence, the correct answer to what `memcmp` does is option 'A', as it accurately describes the function's role in comparing memory contents.
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What will the given C code do?int memcmp(const void *str1, const void ...
In the C library function int memcmp(const void *str1, const void *str2, size_t n)) is used to compare the first n bytes of memory area str1 and memory area str2.
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What will the given C code do?int memcmp(const void *str1, const void *str2, size_t n)a)compares the first n bytes of str1 and str2b)copies the first n bytes of str1 to str2c)copies the first n bytes of str2 to str1d)invalid functionCorrect answer is option 'A'. Can you explain this answer? for Class 6 2025 is part of Class 6 preparation. The Question and answers have been prepared according to the Class 6 exam syllabus. Information about What will the given C code do?int memcmp(const void *str1, const void *str2, size_t n)a)compares the first n bytes of str1 and str2b)copies the first n bytes of str1 to str2c)copies the first n bytes of str2 to str1d)invalid functionCorrect answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 6 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What will the given C code do?int memcmp(const void *str1, const void *str2, size_t n)a)compares the first n bytes of str1 and str2b)copies the first n bytes of str1 to str2c)copies the first n bytes of str2 to str1d)invalid functionCorrect answer is option 'A'. Can you explain this answer?.
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