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C++在堆上申请二维数组 - C/C++ - 清泛IT论坛，有思想、有深度
假设要申请的是double型大小m*n数组有如下方法方法一：优点：申请的空间是连续的 缺点：较难理解
double (*d)[n] = new double[m][n]复制代码
方法二：优点：容易理解 缺点：申请的空间不能连续且需要多个指针才能管理
double *d[m];
for...
优惠券批量生成及导入的思路 - 闲聊区 - 清泛IT论坛，有思想、有深度
...n gen_coupon() {
    do {
        $m = mt_rand(0, PHP_INT_MAX);
        $n = mt_rand(0, PHP_INT_MAX);
        $m = base_convert($m, 10, 36);  // 主随机
       &n...
in a “using” block is a SqlConnection closed on return or exception?
...easier to see what is going to happen, even for the new maintenance programm>me m>r who will support it later:
using (SqlConnection connection = new SqlConnection(connectionString))
{
int employeeID = findEmployeeID();
try
{
connection.Open();
SqlCommand command ...
How to set cookie in node js using express fram>me m>work?
In my application, I need to set a cookie using the express fram>me m>work.I have tried the following code but it's not setting the cookie.
...
Why can I create a class nam>me m>d “var”?
...s not a keyword according to this list.
it is a contextual keyword, so from the context the compiler is able to decide which is your class and which is the contextual keyword, and no confusion arises.
a contextual keyword is:
used to provide a specific m>me m>aning in the code, but it is not a
re...
How to set default values in Rails?
...; ActiveRecord::Migration
def self.up
change_column :people, :last_nam>me m>, :type, :default => "Doe"
end
def self.down
# You can't currently remove default values in Rails
raise ActiveRecord::IrreversibleMigration, "Can't remove the default"
end
end
Because ActiveRecord autodi...
What are all the possible values for HTTP “Content-Type” header?
...
You can find every content type here:
http://www.iana.org/assignm>me m>nts/m>me m>dia-types/m>me m>dia-types.xhtml
The most common type are:
Type application
application/java-archive
application/EDI-X12
application/EDIFACT
application/javascript
application/octet-stream
application/ogg ...
How do I get logs/details of ansible-playbook module executions?
...
If you pass the -v flag to ansible-playbook on the command line, you'll see the stdout and stderr for each task executed:
$ ansible-playbook -v playbook.yaml
Ansible also has built-in support for logging. Add the following lines to your ansible configuration file:
[defaults...
Any equivalent to .= for adding to beginning of string in PHP?
Just wondering if there is som>me m>thing like .= for adding text to the beginning of a string, e.g.:
5 Answers
...
In HTML5, is the localStorage object isolated per page/domain?
Is the HTML5 localStorage object isolated per page/domain? I am wondering because of how I would nam>me m> localStorage keys. Do I need a separate prefix? Or can I nam>me m> them whatever I want?
...