tell me the difference!!!!!!!!!!!!!

[alyssa]

Hi,
Can anybody please tell me the difference between memcmp() and
strncmp() functions ?

[linar3269]

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[Suhana]

"Preets" <pratibha.here@gmail.com> wrote:

> Can anybody please tell me the difference between memcmp() and
> strncmp() functions ?

strncmp() stops at a null byte as well as at n bytes.
E.g., suppose you have the following:

at address a, you have the string "abcde", followed (of course) by a
terminating null character, followed by four chars of garbage;
at address b, you have the string "abcde", followed by a null char,
followed by four chars of different garbage than that at a;

then strncmp(a,b, 10) would return 0, since the _strings_ at those
addresses are equal, up to the first terminating null;
but memcmp(a,b, 10) would return a non-zero value depending on whether
the garbage at a is greater or smaller than that at b.

[Leo Rupert]

memcmp() function:
Description:
The memcmp function compares the first n characters of the object pointed to by s1 to the first n characters of the object pointed to by s2.
Returns:
The memcmp function returns an integer greater than, equal to, or less than zero, accordingly as the object pointed to by s1 is greater than, equal to, or less than the object pointed to by s2.

strncmp() functions:
Description:
The strncmp function compares not more than n characters (characters that follow a null character are not compared) from the array pointed to by s1 to the array pointed to by s2.
Returns:
The strncmp function returns an integer greater than, equal to, or less than zero, accordingly as the possibly null-terminated array pointed to by s1 is greater than, equal to, or less than the possibly null-terminated array pointed to by s2.
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