memcmp
From cppreference.com
| Defined in header
<string.h>
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| int memcmp( const void* lhs, const void* rhs, size_t count );
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Compares the first count characters of the objects pointed to by lhs and rhs. The comparison is done lexicographically.
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[edit] Parameters
| lhs, rhs | - | pointers to the memory buffers to compare |
| count | - | number of bytes to examine |
[edit] Return value
Negative value if lhs is less than rhs.
0 if lhs is equal to rhs.
Positive value if lhs is greater than rhs.
[edit] Example
Run this code
#include <stdio.h> #include <string.h> int main(void) { char a1[] = {'a', 'b', 'c'}; char a2[] = {'a', 'b', 'd'}; printf("'abc' vs 'abd': %2d\n", memcmp(a1, a2, sizeof a1)); printf("'abd' vs 'abc': %2d\n", memcmp(a2, a1, sizeof a1)); printf("'abc' vs 'abc': %2d\n", memcmp(a1, a1, sizeof a1)); return 0; }
Output:
'abc' vs 'abd': -1 'abd' vs 'abc': 1 'abc' vs 'abc': 0
[edit] See also
| compares two strings (function) |
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| compares a certain amount of characters of two strings (function) |
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C++ documentation for memcmp
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