For example,
Is the string constant available until the pointer variable as an automatic variable is discarded?
String literals are static objects so they are in existence as long as the program is running. As "pointer" is an automatic variable it is discarded upon exit from the block in which it is defined but the string literal will still be in memory but you wont have a handle for accessing it anymore. Automatic variables are on the stack segment while static objects are in the text segment or the readonly portion of the data segment and yes the compiler automatically allocates storage for them without the programmer having to do anything...
In a declaration, I have:
const char comment_begin = "<!--";
const char comment_end = "-->";
const int comment_begin_len = strlen(comment_begin);
const int comment_end_len = strlen(comment_end);
When I compile, I get the warnings:
emhttpc.c:64: warning: initializer element is not... (10 Replies)
I'm not sure how to best explain what I'd like to do, so let me give an example. I used to work in a department that deals with internet security. This department had an "internal" website (only people in the building can get on it) and an "external" website (anyone in the world can get on it --... (1 Reply)
Hallo
I have maybe a little bit advanced request....
I need to choose one random part betwen %....
so i have this..
%
text1 text1 text1
text1 text1 text1
text1 text1 text1
%
text2 text2
text2 text2 text2
%
text3 text3 text3
tetx3
%
this choose text between %
awk ' /%/... (8 Replies)
Hi friends,
I am new to Solaris, I have just managed to install Solaris 10 under VirtualBox. As I use the system, I constantly get some very disturbing error messages on my screen, I hope you will help me remove them. Messages are
# syslogd: line 24: WARNING: loghost could not be resolved
... (6 Replies)
Hi. I define my variables as:
month=jul
DD=17
YEAR=2012
transmission_file_name_only=test_$month$DD$YEAR_partial.dat
However when I run my script the variable 'transmission_file_name_only' resolves to:
File "/downloads/test_jul17.dat" not found.
How can I append this '_partial'... (3 Replies)
Hi All !
I am just trying to print bash variable in awk statement as string
here is my script
n=1
for file in `ls *.tk |sort -t"-" -k2n,2`; do
ak=`(awk 'FNR=='$n'{print $0}' res.dat)`
awk '{print "'$ak'",$0}' OFS="\t" $file
n=$((n+1))
unset ak
doneI am getting following error
awk:... (7 Replies)
I'm using LM 17.3x LIVE. Have constant and sometimes, severe lagging issues. Problems started when I "upgraded" to 18.3x. I tried 5 other distros all with the same issues. Went back to 17.3 and , alas, the problem followed. Found this: sudo gedit /etc/sysctl. conf vm. swappiness = 15, but all it... (4 Replies)
Discussion started by: 69Rixter
4 Replies
LEARN ABOUT PHP
mysqli_error
MYSQLI_ERROR(3) 1 MYSQLI_ERROR(3)mysqli::$error - Returns a string description of the last error
Object oriented style
SYNOPSIS
string$mysqli->error ()
DESCRIPTION
Procedural style
string mysqli_error (mysqli $link)
Returns the last error message for the most recent MySQLi function call that can succeed or fail.
PARAMETERS
o $
link -Procedural style only: A link identifier returned by mysqli_connect(3) or mysqli_init(3)RETURN VALUES
A string that describes the error. An empty string if no error occurred.
EXAMPLES
Example #1
$mysqli->error example
Object oriented style
<?php
$mysqli = new mysqli("localhost", "my_user", "my_password", "world");
/* check connection */
if ($mysqli->connect_errno) {
printf("Connect failed: %s
", $mysqli->connect_error);
exit();
}
if (!$mysqli->query("SET a=1")) {
printf("Errormessage: %s
", $mysqli->error);
}
/* close connection */
$mysqli->close();
?>
Procedural style
<?php
$link = mysqli_connect("localhost", "my_user", "my_password", "world");
/* check connection */
if (mysqli_connect_errno()) {
printf("Connect failed: %s
", mysqli_connect_error());
exit();
}
if (!mysqli_query($link, "SET a=1")) {
printf("Errormessage: %s
", mysqli_error($link));
}
/* close connection */
mysqli_close($link);
?>
The above examples will output:
Errormessage: Unknown system variable 'a'
SEE ALSO mysqli_connect_errno(3), mysqli_connect_error(3), mysqli_errno(3), mysqli_sqlstate(3).
PHP Documentation Group MYSQLI_ERROR(3)