The program will not work properly because at Line 1, when the user presses Enter, it will leave in the input buffer 2 character: Enter key (ASCII code 13) and \n (ASCII code 10). Therefore, at Line 2, it will read the \n and will not wait for the user to enter a character. The … Read more
This looks like a good candidate for the TAILQ_* ? “man queue” will give more details – there are simple lists, tail queues and circular queues there. Those are the macros that you’d need to bolt on your own structures, not classes of course. The code for your scenario will look something like this (I … Read more
My question is: Isn’t that dangerous? What if by accident or malicious intent someone creates a 100GB file with no ‘\n’ byte in it – won’t that make my getline() call allocate an insane amount of memory? Yes, what you describe is a plausible risk. However, if the program requires loading an entire line into … Read more
The most straightforward answer is: The difference here is that will place Hello world in the read-only parts of the memory and making s a pointer to that, making any writing operation on this memory illegal. While doing: puts the literal string in read-only memory and copies the string to newly allocated memory on the … Read more
printf(“\nlVptr[60 ] is %d \n”, *(int*)lVptr); This will cast the void pointer to a pointer to an int and then dereference it correctly. If you want to treat it as an array (of one), you could do a slightly ugly ((int *)lVptr)[0]. Using [1] is out of bounds, and therefore not a good idea (as … Read more
scanf (and cousins) have one slightly strange characteristic: white space in (most placed in) the format string matches an arbitrary amount of white space in the input. As it happens, at least in the default “C” locale, a new-line is classified as white space. This means the trailing ‘\n’ is trying to match not only … Read more
I had exactly the same problem right after switching off some (in my opinion unneccessary) Windows services. It turned out that when I switched ON again the “Application Experience” everything resumed working fine. May be you simply have to turn on this service? To switch ON Application Experience: Click the Windows start buttonn. In the … Read more
Chances are you’ve forgotten a semicolon in a header file someplace. Make sure each line ends in ;
There is no hashtable in the standard C library because either: no-one has submitted a proposal to the working group; or the working group has deemed it unnecessary. That’s the way ISO works. Proposals are put forward and accepted or rejected. You have to be careful what you add to the standard library since you … Read more
Use the ll (el-el) long-long modifier with the u (unsigned) conversion. (Works in windows, GNU).