Loops [solved]
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[quote author="peppe" date="1315155068"]But... what's exactly the question? What are you trying to achieve?[/quote]
Just to get those 4 variables to display in a QComboBox.
[code]
QComboBox *comboBox;
[/code]
That's all, like I said, I'm confused here, and can't really answer your question, sorry.
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from what I gather, what you need is a basic book about programming. Doesn't even have to be on C++.
Some more code for you:
@
QComboBox *comboBox;
comboBox = new QComboBox();for (i = 0; i < 4; i++) {
comboBox.addItem(my_var[i]);
}
@
Wrote quite quickly without thinking, might contain nuts! -
Another possibility would be:
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my_var[4] = { "Var1", "Var2", "Var3", "Var4"};QComboBox *comboBox;
comboBox = new QComboBox();for (i = 0; i < sizeof(my_var); i++) {
comboBox.addItem(my_var[i]);
}
@sizeof (array variable) returns the length of the array, if the array is defined as fixed size ;-)
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[quote author="Gerolf" date="1315157192"]
sizeof (array variable) returns the length of the array, if the array is defined as fixed size ;-)[/quote]Well, yes, it does ;) Was actually thinking about using it, but - strangely - decided not to.
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Gerolf, I think it's a little bit confusing.
sizeof, as defined by the standard yields the number in bytes of its operand (since it's an unary operator).
First,
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my_var[4] = { "Var1", "Var2", "Var3", "Var4"};
@lacks a type. This should be :
@
const char *arr[] = { "Var1", "Var2", "Var3", "Var4"};
@Then, @sizeof arr@ will yield the total number of bytes for arr representation. It won't give you the length of the array. Thus, if you need the length, you'll need to divide by the size of its element :
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for (std::size_t i = 0; i < sizeof my_var / sizeof *my_var; i++) {
qDebug() << my_var[i];
}
@and notice that the result of sizeof is a constant of type std::size_t which is defined in the cstddef header
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LOL, thanks for all the posts, this is great, =). And now I think it's starting to come back to me now, I did this one a long time ago, but it was just once, so my memory wasn't kept up on it.. I do remember using the
[code]
for (i = 0; i < (my_var); I++) { comboBox->addItem(my_var[i]);}
[/code]
part, and it worked, this is considered solved, =). Some of that other stuff went over my head, hehe.. The const char *arr[] = { }; part, hehehe..
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octal - true, I've just checked on a live program. Been using QList and such for too long, as it would seem :)
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I'm just getting tired of doing Text Editor after Text Editor, which honestly, isn't getting anywhere, I'm trying to improve my Qt Knowledge some, learn different things. Like, because of this loop issue, I was trying to learn how to make a QProgressBar increase in % when you used the QSlider Object, this might be a little more advanced looping feature, or am I wrong? I set ScrollBar as 0% default setting, and 100% at maximum setting. But, I've since deleted that project, just because I wasn't really getting anywhere with it. I type my apps from ground up, surprised I can remember that much, but I can, it's amazing at what we can remember, =P. Eventually I'll have to learn even more features of Qt, it's a pretty good TK, I showed a friend it, and he couldn't believe how much Qt Supports, from C to C++ to Python, he tried to run the old text editor I had, but kept getting errors he said, he thinks it's he Qt installation.. But anyway, thanks for the responses, =).
