DoctorTristan posted:

Am I right in thinking that if I have a class with a public static member, I should always initialise it in a .cpp file and not in the header?

Mustach posted:

Yes, only constant integral types can be initialized in the class declaration/header (until C++0x).

Avenging Dentist posted:

Incorrect. Variadic arguments are subject to the rules of default argument promotion (float -> double, and smaller integer types converted up to int or unsigned int).

Avenging Dentist posted:

EDIT: note that this means integral types larger than int retain their size and require knowledge of their types to be dereferenced. See §7.15 of the ISO standard.

quote:

If there is no actual next argument, or if type is not compatible with the type of the actual next argument (as promoted according to the default argument promotions), the behavior is undefined, except for the following cases:
* one type is a signed integer type, the other type is the corresponding unsigned integer type, and the value is representable in both types;
* one type is pointer to void and the other is a pointer to a character type.

ctz posted:

I don't think default argument promotion applies here: the interesting arguments are decimal integer literals which are always at least ints (6.4.4.1).

Contero posted:

In C++, static global functions are static in the C way right? As in can be only used by that c/cpp file and not externed? I'm pretty sure this is true I just want to make sure there isn't some special C++ thing going on since static seems to have about 17 different uses.

androo posted:

If I set them both to four (so including 0 it's a 5x5)

androo posted:

(which is called "scrn")

"scrn[0][4] = 1"

in the prntScreen function

Avenging Dentist posted:

Ahhhh, I remember the days when I used to think that the array was the only data structure in the world.

Morton the Mole posted:

I think you need to read up on some basic C++ array stuff, because an_array[4][4] does not yield a 5x5 including the 0th place.

Vinterstum posted:

Don't. Just... don't. The extra letters needed for "screen" and "printScreen" never hurt anyone, you've got plenty of disk space available for sourcecode, and you need all the extra readability you can get.

Avenging Dentist posted:

Ahhhh, I remember the days when I used to think that the array was the only data structure in the world.

androo posted:

I love working with arrays because they're so drat simple (and in terms of tiled 3D space, they're perfect for a beginner like me) but if you can tell me what you started picking up afterwords that would be sweet.

androo posted:

I love working with arrays because they're so drat simple (and in terms of tiled 3D space, they're perfect for a beginner like me) but if you can tell me what you started picking up afterwords that would be sweet.

quote:

Or 4-dimensional, if I wanted to store a bunch of data for each cell?

Dijkstracula posted:

What you want is closer to this:

code:

   struct tile {
      int bg_colour, fg_colour;
      struct enemy *curr_enemy;
         ...
      int is_visible;
   }

   struct tile world[256][256];

Ugg boots posted:

I'm a C++ scrub, but will this:
struct tile world[256][256];
lay out in memory the same as this:
struct tile world[256*256];?

I always get confused with C++'s pointer vs. array stuff.

That Turkey Story posted:

They both occupy the same amount of space in a contiguous block of memory. Multidimensional arrays are row major.

quote:

in the file there are spaces between the numbers as well.

Stealthgerbil posted:

i am having the problem now that when i use the inFile >> next, it reads the entire line of text. i get some weird number instead of 2000, which is the first number.

Avenging Dentist posted:

code:

while(!file.eof())
{
    ...
}

Otto Skorzeny posted:

You know better than to teach him this

Stealthgerbil posted:

code:

while (!in_stream.eof( ))
{
    ...
    return trans;
}

Otto Skorzeny posted:

Stealthgerbil posted:

Well it works except the only problem is that it only reads the first 2 pairs of numbers from the file and doesn't read the rest.

I have it set like

code:

while (!in_stream.eof( ))
{
in_stream >> trans.transAmt >> trans.transCode;
cout << trans.transAmt << endl << trans.transCode;
system("pause");
return trans;
}

It works but it only gets the first 2 pairs of numbers. It doesn't finish reading the file because it doesn't exit the while loop. It just loops the second pair of values read and does the pause function.

TheSleeper posted:

For everyone's sake set up an appointment with your TA or professor or something. I don't think you really understand a lot of really basic concepts in programming.