[E-Mail] Hotel Reservations

Dear Sir or Madam,

Please reserve a single room with a shower and air conditioning from Jan 1st to Jan 5th, under the name of Jack Hsu.
I'd like you to provide a room on the seventh floor, overlooking the whole city, if possible. I am arriving on the afternoon of Jan 1st and leaving on the morning of the Jan 5th.
An early confirmation for this reservation would be much appreciated.

Sincerely yours,
Jack Hsu

[E-Mail] Train Ticket Reservations

Dear Sir or Madam,

I'd like to book a hard seat for the T123 train from A to B on January 21st.
I hope the tickets for T123 haven't been all booked up on that day, but if the tickets have been sold out, please inform me as soon as possible.

I appreciate your early confirmation.
Sincerely yours,
Jack

[E-Mail] Airline Ticket Reservations

Dear Sir or Madam,

I am going to fly from A to B on the earliest flight. Could I book one economy class seat on a flight leaving A on May 12th?
The Agricultural Bank of China has been instructed to pay the fare and booking fee, and I would ask you to submit your invoice directly to them?

I will appreciate your early confirmation.
Sincerely yours,
Brain

[Unix Programming] Zombie

Zombie: Child process terminates without parent's waiting.
As a result, all you have to do is to wait the child process while terminating.


void waitchild() {
  signal( SIGCHLD, waitchild); // re-enable the signal to fit all systems
  while( wait(NULL) <= 0 )
    /*NOTHING*/;
}


int
main (int argc, char **argv)
{
  signal( SIGCHLD, waitchild);
  if (fork() == 0) {
    // child process
  } else {
    // parent
  }
}

Refer:
http://home.educities.edu.tw/shirock/comp/Anti_zombie_process.htm
http://starryalley.twbbs.org/blog/index.php?/archives/683-linux-zombie-process.html

[Google MAP] Address to Google Map

Address -> longitude and latitude -> KML -> Google Map

Address to longitude and latitude:
http://gmaps-samples.googlecode.com/svn/trunk/geocoder/singlegeocode.html

KML:

<?xml version="1.0" encoding="UTF-8"?>
<kml xmlns="http://earth.google.com/kml/2.2">
<Document>

<name>Vincent Cheng</name>
<description><![CDATA[test]]></description>
<Style id="style">
<IconStyle>
<Icon>
<href>http://maps.gstatic.com/mapfiles/ms2/micons/blue-dot.png</href>
</Icon>
</IconStyle>
</Style>

<Placemark>
<name>Test1</name>
<description><![CDATA[]]></description>
<styleUrl>#style</styleUrl>
<Point>
<coordinates>120.913872,24.639008,0.000000</coordinates>
</Point>
</Placemark>

<Placemark>
<name>Test2</name>
<description><![CDATA[]]></description>
<styleUrl>#style</styleUrl>
<Point>
<coordinates>120.916405,24.642361,0.000000</coordinates>
</Point>
</Placemark>

</Document>
</kml>


[C] call by value/reference/address

Call by Value, Call by Address(Pointer), C++ includes Call by Reference
http://csie-tw.blogspot.com/2010/03/call-by-valuecall-by-pointercall-by.html

Call by Value:
int main()
{
  int x=1;
  printf("x=%d\n", x);
  foo(x);
  printf("x=%d\n", x);
}
void foo(int x)
{
  x++;
}

result:
1
1


Call by Address/Pointer:
int main()
{
  int x=1;
  printf("x=%d\n", x);
  foo(&x);
  printf("x=%d\n", x);
}
void foo(int *x)
{
  (*x)++;
}

result:
1
2


Call by Reference:(C++)
int main()
{
  int x=1;
  printf("x=%d\n", x);
  foo(x);
  printf("x=%d\n", x);
}
void foo(int &x)
{
  x++;
}

result:
1
2

[C] pointer to function

#include <stdio.h>
#include <stdlib.h>

void func(int);

main(){
      void (*fp)(int);

      fp = func;

      (*fp)(1);
      fp(2);

      exit(EXIT_SUCCESS);
}

void
func(int arg){
      printf("%d\n", arg);
}