The simplest hint that actually narrows the range is to tell the user "too high" or "too low" for wrong guesses.

Correct; hardware interrupt 9h is the keyboard interrupt, and it's possible to use that to get keyboard states. But if you're compiling for Win32, then by all means use the API like bdiamond...

There certainly is... Using the library functions as much as possible is good (code reuse, more sleep)--but it can be quite educational to write your own as well. It builds character, puts hair on...

The sprintf function (http://www.cplusplus.com/ref/cstdio/sprintf.html) should work for that:
#include <stdio.h>

void Set(char string_time[])
{
sprintf(meridian, string_time);
}

If you...

The for loop without any body will execute (n - 2) times, but the first line in your loop above is j = n; which, as written, alters the value of j and thus jacks around with the loop's normal...

As long as the condition is true the first time it is tested, you're right--the loop behavior is the same. But a for loop always tests the condition before entering the loop body; the above loop...

Is that code complete/correct? The two questions don't make much sense. Both ask how many times the while loop iterates, but what is k supposed to be? And look at the for loop closely--how many...