You have a member function: void func_A(int a, T initvalue = T()) {} that can be called like this: mc.func_A(1); Then you have an overloaded member function: void func_A(int a) {} that can also be called like this: mc.func_A(1); How could the compiler know which function you intend to call by that line? Answer: It … Read more
At least part of the problem is that you are not understanding how operators work in C++. for(i=1;i<=n,completed==0;i++){ The expression i<=n,completed==0 has the effect of evaluating i <= n, discarding the result, then evaluating completed == 0, and giving the result of that. So the end condition of the loop is essentially completed == 0. … Read more
Now, the question states that at most 2 out of A, B, C are non-positive. So, it means that condition that includes the 3 numbers and returns true would be 1. !(A =< 0 && B =< 0 && C <= 0) Here, we know that either one of A, B or C is greater … Read more
Solution in C++14, assuming I understood what you meant: template <class Container> constexpr auto byte_size(const Container& container) { using std::begin; using std::end; return (end(container) – begin(container)) * sizeof(container[0]); } Note that this will work even if the container is empty, since sizeof does not evaluate its operand. It won’t work for std::vector<bool> though—guess you’ll have … Read more
As panta-rei correctly pointed out, it looks like you’re trying to contain a string of the form “string” + string form of (i) but you’re actually doing pointer arithmetic which is illogical in this case (you’re just passing a pointer incremented i from some location – who knows what’s in that memory?). In order to … Read more
Remove #include “ar.cpp” from main. You’re defining insert two times. There is no difference between the relevant rules in C++11 and C++14. You did something different between your test runs that has nothing to do with the language version. I also recommend not calling it .cpp. Conventionally, nothing you include should be called .cpp. Since … Read more
Optimization was the wrong term, but the code can be rewritten to find a better (more reduced, or succinct to the business) logic. X < min(Y, Z) <=> X < Y and X < Z X < max(Y, Z) <=> X < Y or X < Z (less usefull) Then possible rewrites are return ((e … Read more
For any array or pointer a and index i, the expression a[i] is exactly equal to *(a + i). From that we can draw the conclusion that a + i is a pointer which is equal to &a[i]. So when you try to do &(a + 1) that’s really equal to &&a[1] which makes no … Read more
You have p as some pointer. Who is going to allocate the memory that pointer points to? In C it is almost always the responsibility of the caller to allocate any buffers before the call. If you don’t want to, then use a std::string instead. solved file handling I/O c++ error
The actual type is hidden as it’s local inside the function, so you can’t explicitly use it. You should however be able to use decltype as in decltype(create<int>()) v = create<int>(); I fail to see a reason to do like this though, when auto works. 1 solved How to specify type of a constexpr function … Read more
So how is the 10000th element stored here? The element isn’t stored in the vector. It’s ‘stored’ in a piece of memory that is unrelated to the vector. Isn’t the expected behavior here a “Segmentation fault”? No. The behaviour is undefined, so there is no behaviour to expect. But the above runs successfully. That’s a … Read more
The part in is_attaced in which you check the diagonals is not working. It has two basic problems, first you dont check all diagonals all rows – you just check the previous row. And, second, you are doing out of bound accesses, when you are in the first or last column. An implementation that is … Read more
Depending on the file structure (does it contain line/column headers, single/multi-line?) you use QString::split() to get a QStringList per line. Then you assign the stringlist items to the variables according to your csv structure knowledge. 0 solved Qt separating csv file and storing to differnt variables
The speed difference is largely due to the iostream I/O functions maintaining synchronization with the C I/O functions. We can turn this off with a call to std::ios::sync_with_stdio(false); By default standard C++ streams are synchronized to the standard C stream after each input/output operation. Once synchronization is turned off, the C++ standard streams are allowed … Read more
The issue is that n keeps growing, but your array does not. This code invokes undefined behavior, which thankfully caused a segfault for you: while(ch==’y’) { n++; cout<<“Enter 1 more element: “; cin>>arr[n]; cout<<“Want to enter more? “; cin>>ch; } arr has only been allocated to store n elements. Simply writing past the end will … Read more