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int num1 = 10;
int num2 = 11;

num1 ^= num2;
num2 ^= num1;
num1 ^= num2;

num1 = 11 num2 = 10

The "learn X in Y days" series of books really sucks IMO

You would be better off getting a "real" book, I recommend
"A Book On C" by pohl/kelley -- it's great for beginners/intermediate

He requires a timeout for connect, this cannot be done by setting a socket option. I guess you're thinking of SO_RCVTIMEO and SO_SNDTIMEO -- they don't set any kind of timeouts for connect.

You could also setup a signal handler for SIGALRM using signal(2)

and then use alarm(2) to send an alarm signal at a specified time.

This will cause connect() to return with EINTR...

int mystrlen(const char *s);

int main() {
char str[] = "123456789abcdefghijklmnopqrstuvwxyz";

printf("Length: %d", mystrlen(str));

return 0;
}

Skipping the first line is easy, fgets(3) will stop reading when encountering a newline, thus your first call to fgets can just discard the data/not write it out to your file.

Skipping the last...

Have you looked at getopt() ?

something like:




#include <unistd.h>

int main(int argc, char **argv) {

change to:



int CreateFile(char *HotN, char *Extn) {
char TmpDt[30], *tmpname;

Do you mean something like indent(1) ?

Try man indent