fret logic posted:

Only returns the first character you enter. I thought that with the while loop, it does the first statement, you hit enter, then it does "putchar(c)", but I don't understand why it's holding the entire string of characters. Sorry if this is incredibly obvious

fret logic posted:

How is this different from the one without the loop? It'll let you type in an entire string, but only returns the first character. Are you saying that once you hit enter, it repeats the loop for each character in the line? I guess I'm not understanding how the loop affects the process.

illamint posted:

the regular expression "^([A-Za-z0-9]+),([A-Za-z0-9]*),([A-Za-z0-9]*),(s?f?|f?s?);$"),

Thug Bonnet posted:

No, that's what I'm asking! I'm just kind of curious, honestly. But how would the program know "where it is" in memory, how large it is, etc. Also, I assume it's not necessarily contiguous..

Thug Bonnet posted:

No, that's what I'm asking! I'm just kind of curious, honestly. But how would the program know "where it is" in memory, how large it is, etc. Also, I assume it's not necessarily contiguous..

floWenoL posted:

What is this "typing-time"?

elevatordeadline posted:

Teach me about 64-bit integers in C.

In Java, int is four bytes and long is eight bytes. That's not the case in C, where, if I understand correctly, sizeof(long) only has to be at least equal to sizeof(int). So what should I do when I need a 64-bit integer?

elevatordeadline posted:

Those numbers are not the same numbers at all.

fret logic posted:

Yeah I know that much, I just haven't found the basic idea behind the graphics in that game, graphics that for some odd reason I really enjoy.

TurtleBoy posted:

this sounds like what I am looking for.

Morgen posted:

attributes.txt

code:

0.40   0.20   0.30   0.60 
0.00030000   0.00020000   0.00010000   0.00010000   0.00006366 
40 20 30 60 
10 

Morgen posted:

I can't seem to make it work, it gives me a runtime error. Am I missing something important?

Citizen Erased posted:

Does anyone know of a faster alternative to the standard library vector container? A year or so ago I made a 3D application which relied very heavily on the stl vector...

ruden posted:

As to how I'm drawing it, basically it's nested for loops with graphics.DrawLine() functions. I'm not sure how C++ interprets that exactly, but I'm not drawing pixel for pixel. I'm only using black and white, so color is a minimum too.

crazypenguin posted:

I *think* gimp handles large files pretty well...

ruden posted:

Ok, I made the PS file of the image. This is the situation as it stands:

a) small images are made perfectly, the numbers work out and everything and the image is perfect
b) the large image does not display correctly at all, it's cut short on the top and bottom, presumably because I'm doing something on the order of "newpath 10 10 moveto 33600 336000 lineto stroke" and the numbers are just too big to display correctly in a PS viewer
c) the file is not readable in any Adobe reader, it says it is corrupted and unreadable, but various PS readers like GSView etc, can read it fine. If I hand this PS file to the printer, and they can't read it, I'm out of luck, do I need some kind of special header for Adobe to read it?

Thanks.

Sarah Sherman posted:

Birthday Paradox

Avenging Dentist posted:

code:

#define SQUARE_REAL(x) (x)*(x)

Evil Robot posted:

Although anyone who argues against this style of function definition or loop formatting can go straight to hell, the fuckers:

code:

void foo(void* args)
{
    for (size_t i(0); i < 5; ++i)
    {
        blah blah blah
    }
}

litghost posted:

Software I worked on knows if endian-ness is swapped by checking known fields. Example, the month as a 32-bit integer. It should never be 0, and will not be greater than 12. If you read it as 213134142 or something, swapped endian-ness. This will only work if you can find a piece of data like this. We just fixed a bug where the date was set to 0/0/0 and it broke the endian swap code, so this is fragile. However, it is better than nothing.

ehnus posted:

I'd be willing to bet that due to member padding within data types that the savings you see by narrowing those types won't actually be realized

Avenging Dentist posted:

I was messing around today and I realized that you can make template unions.

ShinAli posted:

Got a quick question about pointers in C.

Right now I got a struct with a growing character array which would contain multiple strings. Every time I run out of space (when adding strings), I realloc the struct. This keeps it in one memory block.

I also have a string (or character pointer) array which the elements point to individual strings in the character array of the struct. The obvious problem being is that when the character array struct gets reallocated, the pointers in the string array get outdated.

To update them, I search the outdated string array for the base pointer of the old struct (I just compare all pointers via ptr1 < ptr2 in a loop and which ever is the smallest, I figure is the base pointer). The idea I have is to subtract the old base pointer with every char pointer in the array, then add the base pointer of the realloc'ed struct character array to every element.

I'm not sure if I'm allowed to do that, though. Do I cast the pointers to some other type, do what I need to do, and cast it back to a pointer?

pintle posted:

At about iSize at 700, it started to crash. When I debugged, it gave me an "Out of Memory" on the 4th call of that function. I am, however, calling and passing these structs around. Could it be something about the STACK size?

Avenging Dentist posted:

Especially since


So your teacher is so lazy that he's actually typing more to do the same thing.

Kreez posted:

Kreez posted:

Cool, %lf works great, thanks.

Odd that something basic like that would be left out of even the basic C syntax overview that exists in my textbook.

Safe and Secure! posted:

Is anyone here familiar with all of these books? C++PP just seems like such a huge book compared to The C Programming Language, but The C++ Programming Language isn't any better in that regard. Is C++ just an incredibly "large" language or what?

CapnBry posted:

Here is something to test your pedantic C knowledge:

code:

char buffer[10];
size_t x = sizeof(buffer-1);

What does this code do? The intent was to get sizeof(buffer)-1 but I have known C for 20 years and have no idea what you're actually getting the sizeof.

Paniolo posted:

I would guess because their use case for protocol buffers involves data transfer via HTTP or other text-based network protocols where the data needs to be encoded in a way that allows it to be represented as a string (i.e. no null bytes.)

http://stackoverflow.com/questions/2037155/stdstring-as-c-byte-array posted:

Google's Protocol buffer uses the C++ standard string class std::string as variable size byte array (see here) similar to Python where the string class is also used as byte array (at least until Python 3.0).

This approach seems to be good:

* It allows fast assignment via assign and fast direct access via data that is not allowed with vector<byte>
* It allows easier memory management and const references, unlike using byte*.

shrughes posted:

Since 2016 doesn't fit in a byte, this takes a longer instruction, and probably a more expensive instruction, than one that writes to %rax+32. It's certainly a different instruction.

Otto Skorzeny posted:

So you learned your lesson from the minecraft project

roomforthetuna posted:

The idea is that a single instruction is functionally treated the same as a squiggly-brackets-enclosed block containing a single instruction. An "if" is basically a single instruction to conditionally execute another block.

ie. "else if" is not a special instruction in any way, it's treated the same as "else while" or "else for" or "else switch".

shodanjr_gr posted:

I'm involved in a project that requires targeting Android and x86 Windows. The application would need OpenGL support with shaders and multitouch functionality. Other niceties (like GUI widgets) would also be nice.

Does such a pipe-dream of a framework exist?

pseudorandom name posted:

Nope. volatile is for memory mapped IO, it isn't sufficient for inter-thread communication.