#include <stdio.h>
#include <string.h>
void demo(const char* lhs, const char* rhs, size_t sz)
{
for(size_t n = 0; n < sz; ++n)
putchar(lhs[n]);
int rc = memcmp(lhs, rhs, sz);
const char *rel = rc < 0 ? " precedes " : rc > 0 ? " follows " : " compares equal ";
fputs(rel, stdout);
for(size_t n = 0; n < sz; ++n)
putchar(rhs[n]);
puts(" in lexicographical order");
}
int main(void)
{
char a1[] = {'a','b','c'};
char a2[sizeof a1] = {'a','b','d'};
demo(a1, a2, sizeof a1);
demo(a2, a1, sizeof a1);
demo(a1, a1, sizeof a1);
}