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How to sum up elements of a C++ vector?
...
Actually there are quite a few methods.
int sum_of_elems = 0;
C++03
Classic for loop:
for(std::vector<int>::iterator it = vector.begin(); it != vector.end(); ++it)
sum_of_elems += *it;
Using a standard algorithm:
#include <numeric>
sum_o...
Can we have functions inside functions in C++?
... C++17), you can have functions inside functions in the form of a lambda:
int main() {
// This declares a lambda, which can be called just like a function
auto print_message = [](std::string message)
{
std::cout << message << "\n";
};
// Prints "Hello!" 1...
For i = 0, why is (i += i++) equal to 0?
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This:
int i = 0;
i += i++
Can be seen as you doing (the following is a gross oversimplification):
int i = 0;
i = i + i; // i=0 because the ++ is a postfix operator and hasn't been executed
i + 1; // Note that you are discarding ...
Combining C++ and C - how does #ifdef __cplusplus work?
...acy C code. We've started writing in C++, with the intent to eventually convert the legacy code, as well. I'm a little confused about how the C and C++ interact. I understand that by wrapping the C code with extern "C" the C++ compiler will not mangle the C code's names, but I'm not ent...
Scrollview vertical and horizontal in android
...ends ScrollView {
public VScroll(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
}
public VScroll(Context context, AttributeSet attrs) {
super(context, attrs);
}
public VScroll(Context context) {
super(context);
...
What's the difference between size_t and int in C++?
...xamples I see a use of the type size_t where I would have used a simple int . What's the difference, and why size_t should be better?
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Display current time in 12 hour format with AM/PM
...nks @RuchiraGayanRanaweei... i just wondering to capture the 24 format and convert it into the AM/PM format...
– gumuruh
Aug 6 '14 at 3:26
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64 bit OS下int占几个字节？ - C/C++ - 清泛网 - 专注C/C++及内核技术
64 bit OS下int占几个字节？int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的，不受编译器的影响。__int64才是8位的。另外，指针是受编译器 OS影响的，3...int固定4字节，不要受64 bit的混淆。int是由编程语言设计决定的...
/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘i...
/usr/include/c++/4.9/bits/stl_iterator_base_types.h:165:53: error: ‘int’ is not a class, struct, or union type先看下面的代码(来自:SO)：#include <iostream>#include <cmath>#include <vector>using namespace std;double distance(int a, in...先看下面的代码(来自: SO)：
#include <i...
Append values to a set in Python
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The way I like to do this is to convert both the original set and the values I'd like to add into lists, add them, and then convert them back into a set, like this:
setMenu = {"Eggs", "Bacon"}
print(setMenu)
> {'Bacon', 'Eggs'}
setMenu = set(list(setMen...