Question
If the two strings are found to be unequal then strcmp returns difference between the first
non-matching pair of characters.
Answer: Option A
int strcmp (const char * s1, const char * s2)
{
for(; *s1 == *s2; ++s1, ++s2)
{
if(*s1 == 0)
return 0;
}
return *(unsigned char *)s1 < *(unsigned char *)s2 ? -1 : 1;
}
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g = strcmp(s1, s2); returns 0 when the strings are equal, a negative integer when s1 is less than s2, or a positive integer if s1 is greater than s2, that strcmp() not only returns -1, 0 and +1, but also other negative or positive values(returns difference between the first non-matching pair of characters between s1 and s2).
A possible implementation for strcmp() in "The Standard C Library".
int strcmp (const char * s1, const char * s2)
{
for(; *s1 == *s2; ++s1, ++s2)
{
if(*s1 == 0)
return 0;
}
return *(unsigned char *)s1 < *(unsigned char *)s2 ? -1 : 1;
}
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