Thread: Where is the defination of memcmp?

Originally Posted by shwetha_siddu

Dear all,
What is the standard file to use memcmp? i am getting repeatedly "memcmp is undefined."

string.h

I've always wondered why they put it in string.h instead of something like memory.h.

Originally Posted by cpjust

I've always wondered why they put it in string.h instead of something like memory.h.

Because I suspect it was part of the same (small set of) source file(s) - probably written in assembler to make the best performance. And since the group of memcpy, strcpy, strcat and group of memcmp, strcmp are often quite alike, it's possible to re-use some of the code in one from the other,e.g. use strlen() + memcpy() to do strcpy(), strcat() - or write some code that is shared by both.

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Mats