Is the standard library strcmp function fairly efficient, or are there faster strcmp methods out there?
Is the standard library strcmp function fairly efficient, or are there faster strcmp methods out there?
Any given implementation is free to implement strcmp() however it chooses, so long as it conforms to the interface described in the standard.
It's generally best to assume that whoever implemented it for your particular OS/Compiler knew what they were doing, and it will be reasonably efficient.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
strcmp
all the possible libraries use the following method to compare two strings
i dont think there could be a code better than this.....Code:for(i=1;i<strlen(smaller of the strings);i++) { int count=0 if(string[i]!=string2[i]) { count++ } } return count;
any questions any type in programming
a ready made answer
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Maybe not.
This is the GNU version of strcmp()
Code:/* Compare S1 and S2, returning less than, equal to or greater than zero if S1 is lexicographically less than, equal to or greater than S2. */ int strcmp (p1, p2) const char *p1; const char *p2; { register const unsigned char *s1 = (const unsigned char *) p1; register const unsigned char *s2 = (const unsigned char *) p2; unsigned reg_char c1, c2; do { c1 = (unsigned char) *s1++; c2 = (unsigned char) *s2++; if (c1 == '\0') return c1 - c2; } while (c1 == c2); return c1 - c2; }
> for(i=1;i<strlen(smaller of the strings);i++)
1. arrays start at 0,
2. no serious attempt would bother calling strlen in advance, since it's easy to just test the current characters with '\0' anyway.
If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
If at first you don't succeed, try writing your phone number on the exam paper.
