Update:
Why not just use the gdb `printf` command?

    (gdb) printf &quot;%s&quot;, x
    asd
    qwe
    ...
    (gdb)


----------
Old answer:
From within the debugger you can execute commands. Just call `printf`

    (gdb) call printf(&quot;%s&quot;, x)
    asd
    qwe
    ...
    (gdb)


Use the string specifier:

    print /s x

For some compilers, there is a packing specifier for structs, for example ::

&lt;pre&gt;
RealView ARM compiler has &quot;__packed&quot;
Gnu C Compiler has &quot;__attribute__ ((__packed__))&quot;
Visual C++ has no equivalent, it only has the &quot;#pragma pack(1)&quot;
&lt;/pre&gt;

I need something that I can put into the **struct** definition.

Any info/hack/suggestion ? TIA...


Visual C++ equivalent of GCC&#39;s __attribute__ ((__packed__))

I have two excel files with the same structure:  they both have 1 column with data.  One has 800 records and the other has 805 records, but I am not sure which of the 5 in the 805 set are not in the 800 set.  Can I find this out using Excel?

Find the differences between 2 Excel worksheets?

I have a variable 

    char* x = &quot;asd\nqwe\n ... &quot;

and I want to print it with newlines printed as newlines not _backslash n_.
Is it possible?

How to print a null-terminated string with newlines without showing backslash escapes in gdb?

I have a variable
<pre><code class="hljs language-ini">char* x = "asd\nqwe\n ... "
</code></pre>
and I want to print it with newlines printed as newlines not backslash n.
Is it possible?

I got this problem from an interview with Microsoft.

&gt; Given an array of random integers,
&gt; write an algorithm in C that removes
&gt; duplicated numbers and return the unique numbers in the original
&gt; array.

E.g Input: `{4, 8, 4, 1, 1, 2, 9}`  Output: `{4, 8, 1, 2, 9, ?, ?}`

One caveat is that the expected algorithm should not required the array to be sorted first. And when an element has been removed, the following elements must be shifted forward as well. Anyway, value of elements at the tail of the array where elements were shifted forward are negligible. 

**Update:** The result must be returned in the original array and helper data structure (e.g. hashtable) should not be used. However, I guess order preservation is not necessary.

**Update2:** For those who wonder why these impractical constraints, this was an interview question and all these constraints are discussed during the thinking process to see how I can come up with different ideas.

Algorithm: efficient way to remove duplicate integers from an array

What is the difference between doing:

    ptr = malloc (MAXELEMS * sizeof(char *));

or:

    ptr = calloc (MAXELEMS, sizeof(char*));


When is it a good idea to use calloc over malloc or vice versa?

Difference between malloc and calloc?

I am trying to come up with a method that takes an integer and returns a boolean to say if the number is prime or not and I don&#39;t know much C; would anyone care to give me some pointers?

Basically, I would do this in C# like this:
 
    static bool IsPrime(int number)
    {
        for (int i = 2; i &lt; number; i++)
        {
            if (number % i == 0 &amp;&amp; i != number)
                return false;
        }
        return true;
    }


C - determine if a number is prime

I&#39;m creating some sort of frontend for a program. To launch the program I&#39;m using the call &lt;code&gt;CreateProcess()&lt;/code&gt;, which among other things receives a pointer to a &lt;code&gt;STARTUPINFO&lt;/code&gt; structure. To initialize the structure I used to do:

    STARTUPINFO startupInfo = {0}; // Or even &#39;\0&#39;.
    startupInfo.cb = sizeof(startupInfo);

When compiling the program with GCC enabling these sets of warnings &lt;code&gt;-Wall -Wextra&lt;/code&gt; it gives me a warning saying that there&#39;s a missing initializer pointing to the first line.

    warning: missing initializer
    warning: (near initialization for &#39;startupInfo.lpReserved&#39;)

So I ended up doing:

    STARTUPINFO startupInfo;
    memset(&amp;startupInfo, 0, sizeof(startupInfo));
    startupInfo.cb = sizeof(startupInfo);

And this way the compiler doesn&#39;t give any warning.
The question is, what is the difference between these ways of initializing a structure?
Using the first method, isn&#39;t the structure initialized?
Which one would you recommend?


Why is the compiler throwing this warning: &quot;missing initializer&quot;? Isn&#39;t the structure initialized?

I am looking for a sniffer that can work with the loopback address in Windows.

So far, I found Microsoft Network Monitor which is a nice tool, but for localhost it&#39;s useless because on Windows, localhost packets don&#39;t pass through the regular network stack, so they&#39;re invisible to an ethernet sniffer like MS Network Monitor.

How do you debug applications that send data in the loopback mechanism? Any good (open source) sniffers that can work with localhost?

UPDATE: If you have experience with a tool, it would be nice to have a short description for future reference

Sniffer for localhost (Windows OS)

I have been studying and reading about Scrum in the last few days and reading about Sprint Planning and tasks. One problem that popped into my mind is how to deal with bugs in Scrum. Henrik Kniberg lists some ways of dealing with this issue in his very nice book [Scrum and XP from the Trenches][1] :

 1. Product owner prints out the most
    high priority Jira items, brings
    them to the sprint planning meeting,
    and puts them up on the wall
    together with the other stories
    (thereby implicitly specifying the
    priority of these items compared to
    the other stories). 
 2. Product owner creates stories that refer to Jira
    items. For example “Fix the most
    critical back office reporting bugs,
    Jira-124, Jira- 126, and Jira-180”.
 3. Bug-fixing is considered to be
    outside of the sprint, i.e. the team
    keeps a low enough focus factor (for
    example 50%) to ensure that they
    have time to fix bugs. It is then
    simply assumed that the team will
    spend a certain amount of time each
    sprint fixing Jira- reported bugs 
 4. Put the product backlog in Jira
    (i.e. ditch Excel). Treat bugs just
    like any other story.

Is this really something that needs to be decided per-project basis or are there better solutions? I can think of problems with each of those approaches. Is there a hybrid coming from those approaches that works best? How do you handle this in your projects?

  [1]: http://www.crisp.se/henrik.kniberg/ScrumAndXpFromTheTrenches.pdf

Best ways to fit bug fixing into a Scrum process?

I should probably know this already, but I&#39;m not sure and I don&#39;t see it documented.

I use System.Diagnostics.Debug.WriteLine quite often during the development process to be able to track changes to variables or exceptions as I&#39;m debugging the code.  This is meant to make development and understanding what&#39;s happening easier **only** during development.  I normally either comment out the code or delete it when I go to production.

I&#39;m wondering what happens if I forget to comment the code out.  Say, for example, that during the development cycle, I&#39;m tracking error information that may log a connection sting to the output window using Debug.Write Line.  This is obviously OK while developing, but I&#39;m wondering if when I go live, if there is a risk here.  Can someone attach a debugger to my live executable and trap this output?  Or is it something that only produces output in Visual Studio?  

And what about when we switch from debug to release?  Does this code get ignored by the compiler if we compile for release?

System.Diagnostics.Debug.WriteLine in production code

What are your best tips for debugging Python?

Please don&#39;t just list a particular debugger without saying what it can actually do.

### Related
* [What are good ways to make my Python code run first time?](https://stackoverflow.com/questions/299704) - This discusses minimizing errors

Python debugging tips

Could you give an example where `static_assert(...)` (&#39;C++11&#39;) would solve the problem in hand elegantly?

I am familiar with run-time `assert(...)`. When should I prefer `static_assert(...)` over regular `assert(...)`?

Also, in `boost` there is something called `BOOST_STATIC_ASSERT`, is it the same as `static_assert(...)`?

What does static_assert do, and what would you use it for?

I came upon a struct (called `ngx_http_variable_value_t`) in my GDB (debugger) session and I would like to print what fields it has in the console.

Is that possible?

How do I show what fields a struct has in GDB?

I want to execute the very simple command

    print var1, var2, var3, var4 

in gdb to examine the values of the vars from time to time.

I don&#39;t want to use display because it clutters up my view.

*How can I do this?* Right now all I can do is:

    p var1  
    p var2  
    p var3  
    p var4  

Print multiple variables with one command in GDB

I&#39;m doing some assembly-level debugging in GDB. Is there a way to get GDB to show me the current assembly instruction in the same way that it shows the current source line? The default output after every command looks like this:

    0x0001433f      990         Foo::bar(p);

This gives me the address of the current instruction, but I have to keep referring back to the output of `disassemble` in order to see which instruction I&#39;m currently executing.


Show current assembly instruction in GDB

I have some compiled libraries on x86 Linux and I want to quickly determine whether they were compiled with debugging symbols.  

How can I tell if a library was compiled with -g?

I&#39;d like to have `gdb` immediately run the executable, as if I&#39;d typed &quot;run&quot;
(motivation: I dislike typing &quot;run&quot;).

One way is to pipe the command to `gdb` like this:

    $ echo run | gdb myApp

But the problem with this approach is that you lose interactivity with `gdb`,
eg. if a breakpoint triggers or `myApp` crashes, `gdb` quits.
This method is discussed [here](https://stackoverflow.com/questions/322110/invoke-gdb-to-automatically-pass-arguments-to-the-program-being-debugged).

Looking at the options in `--help`, I don&#39;t see a way to do this, but perhaps I&#39;m missing something.


Content Type	Original Author	Original Content on Stackoverflow
Question	Łukasz Lew	View Question on Stackoverflow
Solution 1 - C	ezpz	View Answer on Stackoverflow
Solution 2 - C	netskink	View Answer on Stackoverflow

How to print a null-terminated string with newlines without showing backslash escapes in gdb?

C Problem Overview

C Solutions

Solution 1 - C

Solution 2 - C

Find the differences between 2 Excel worksheets?

Visual C++ equivalent of GCC's attribute ((packed))

Attributions