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Questions tagged [packing]

Use this tag for questions related to packing, which can extend from struct packing to grouping elements together.

In C, will prevent the compiler from adding padding to a struct, which will save some memory, but may affect access speed to the members of the struct (since it may not memory-aligned).

However, has a general meaning as well, when you want to group/cluster similar elements together.

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Finding the optimal arrangement of squares inside a bigger square

lets say the sides of the big square are 50 units. i want to fit as much 3x3 and 2x2 squares inside of it as possible with the condition that N2x2=0.7 N3x3 I tried the sat solver in python but the computing time gets insane with just a 20x20 grid…
Purgatory
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Find the closest combination of items to the requirements

So my problem is a little bit like knapsnack problem but with a bit of difference. Let's say I went to shopping and I am obliged to buy things that meet the requirements or the closest I can get (over the requirement or lower). For a better…
taha boud
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Unexpected value after type casting in c

I was implementing the code for sending data through a raw socket. As part of that, I have to construct an IP packet. But I am facing the problem as explained below using a sample program. #include struct iph { unsigned char ihl:4; …
shafeeq
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Can someone please explain the results returned by 'sizeof' in this code

I don't undertand the output shown below. I know that whenever a virtual function is present it creates a vptr but still the size printed is more than I would expect: #include using namespace std; class Base { int x; int y; int…
Pritul Dave
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Determine struct size, ignoring padding

I receive datagrams through a network and I would like to copy the data to a struct with the appropirate fields (corresponding to the format of the message). There are many different types of datagrams (with different fields and size). Here is a…
martinkunev
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C++ - cstyle structure/class packing pertinent?

Context I primirarly code in C. Trying c++. Not good enough with assembly to tell myself. But improving. Questions Do struct AND classes benefit from structure packing in c++ or is it only a c'ish thing? Do c++ add lot of magic? Will the private /…
Larry
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In java is it possible to pack a integer number that is expected not to be negative & be final (not overflow) into a short?

"Unsigned int" into a short and back. Is this possible? How to do it if so? Grrrr. I forgot how signed numbers are implemented. The question makes no sense. Thanks anyway. I was going to downvote myself, you can do it instead.
i30817
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Packing Circles inside a Circle

Given unit circle, and a set of M smaller circles of radius r. Find the maximum radius of the smaller circles that allows them all to fit inside the unit circle without overlap. I have the following circles packing in polygon example link I want…
user3430535
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How can I build up the densely packing spheres, starting from a single one, in C++?

Let's assume that I start out with a single sphere of a defined radius R, and an array of three elements, containing the cartesian coordinates: double vecpos[3]; vecpos[0]= 0.0; vecpos[1]= 0.0; vecpos[2]= 0.0; double radius= 5; Now, I would like to…
Mark Anderson
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Trying to create a word count function

I'm trying to create a function: word_count("I do not like it Sam I Am") gets back a dictionary like: {'i': 2, 'do': 1, 'it': 1, 'sam': 1, 'like': 1, 'not': 1, 'am': 1} I've no idea how to begin.
Mohit Yadav
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How can I model the Circle packing problem with pyomo?

Circle packing problem in a circle container with minimal radius
Limeme Ben Ali
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How to Pack two executables into one executable, then extract and run them?

In Windows, what software is there for me to use so I can pack two executable files into one other executable, and then how do I make this other executable extract the two executables and run them both at the same time ? In other words, how do I…
Robert Tattorn
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Timetable events packing

I'm working on timetable for school purposes. I receive time-ordered list of events and my goal is to draw them on timeline. The problem is that some event overlaps another (as shown on the picture below). What I want to do is to "pack" this events…
user3533170
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How to calculate at runtime the maximum value allowed before datatype rollover?

I have the following structure: struct Some_Struct { uint32_t a; int16_t b; uint8_t c; }; struct Other_Struct { uint32_t a; uint32_t b; uint32_t c; }; The variable size is being calculated as such: uint32_t size =…
Zhro
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How to declare structures in C to avoid structure corruption?

I have a similar problem like this question and my problem was solved similar to this answer but I can't understand what caused this issue. I have three structures File, Line and Buffer declared in app.h. typedef struct File { FILE *fs; char…
ziggurat
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