[ad_1] The compiler will translate a call to a member function into a call to a static function, with an implied this parameter pointing to the object. That means the contents of the object, valid or invalid, are not relevant to the whether the call is made. This changes if the method is virtual, since … Read more
[ad_1] What you are looking for is a tagged union also called a variant. It allows you to store multiple data types at the same location just like a regular union but includes an additional but separate data member that indicates it’s type. The C++ Standard Library does not include variants but they are easy … Read more
[ad_1] Update It was just pointed out to me in a comment by Jimi, that DownloadFileAsync is an event driven call and not awaitable. Though, there is a WebClient.DownloadFileTaskAsync version, which would be the appropriate one to use in this example, it is an awaitable call and returns a Task Downloads the specified resource to … Read more
[ad_1] Code works perfectly fine once you change int fromfile; //gets the integer from file. to std::string fromfile;. I do not understand how your compiler did not complain about it. As other answers say, it is best practice to not have file open multiple times but that is not issue in your case. [ad_2] solved … Read more
[ad_1] There are different things that can be called strings in C++, std::string is the main one, and that already provides those operators. C-style null terminated strings are another, and string literals yet another. For the latter two, you cannot overload operator< or operator>, as you can only overload operators for user defined types. Even … Read more
[ad_1] JPEG files are not text files. You need to Read and write bytes instead. ie: DirectoryInfo d = new DirectoryInfo(@”E:\New folder (2)”); FileInfo[] Files = d.GetFiles(); foreach (FileInfo file in Files) { string changed = Path.ChangeExtension(file.FullName, “jpg”); File.Copy(file.FullName, changed); } Of course file themselves should be JPEG for this to work. 4 [ad_2] solved … Read more
[ad_1] That probably is because the method send only takes a const char* as argument and not a std::string. Try: uBit.serial.send(result.c_str()); edit: Now your code has changed and result is a stringstream: uBit.serial.send(result.str().c_str()). 8 [ad_2] solved Why argument accept “text” but not string variable? [closed]
[ad_1] That is not possible. From the standard, 6.7 Declarations (emphasis mine): If an identifier has no linkage, there shall be no more than one declaration of the identifier (in a declarator or type specifier) with the same scope and in the same name space, … As to no linkage, 6.2.2 Linkages of identifiers (emphasis … Read more
[ad_1] A do–while statement loops as long as the while expression is true. Your while expression is choice != ‘c’ || choice != ‘n’ In common English, that expression means choice is not ‘c’ OR choice is not ‘n’ That statement, logically, is always true. choice is always not one of those things. In both … Read more
[ad_1] This seems to be a MinGW compiler bug since when using MSVC in Visual Studio to compile the code, the same exception does not occur either. 4 [ad_2] solved std::ifstream crashes in release build on Windows with exit code 0xC0000409: Unknown software exception
[ad_1] You may use switch case and for loop for simplicity. using namespace std; #include<iostream> int main() { string a; cin>>a; for(int i=0;a[i]!=’\0′;i++) { switch (a[i]) { case ‘a’:a[i]=’.’; break; case ‘e’:a[i]=’.’; break; case ‘i’:a[i]=’.’; break; case ‘o’:a[i]=’.’; break; case ‘u’:a[i]=’.’; break; } } cout<<a; } 6 [ad_2] solved How to replace vowel letters with … Read more
[ad_1] I have a task to create an array of pointers to structure You need two “sizes”: The number of pointers The size of the struct You only pass one. So fix your code for example like this #include <stdlib.h> /* for malloc(), free() */ void create1(void *** pppv, size_t n, size_t s) { assert(NULL … Read more
[ad_1] def SPN(nums, s): if s == 0: # Empty array return +∞ if nums[s-1] > 0: # num[s] is admissible, recurse and keep the smallest return min(nums[s-1], SPN(nums, s-1)) else: # Just recurse return SPN(nums, s-1) print SPN(nums, len(nums) The c++ version: #include <vector> using namespace std; int rec_min_pos(const vector<int> & nums, int size) … Read more
[ad_1] Consider the string “1134” String Variable ()1134 0 (1)134 0 * 10 + 1 = 1 1(1)34 1 * 10 + 1 = 11 11(3)4 11 * 10 + 3 = 113 113(4) 113 * 10 + 4 = 1134 [ad_2] solved Can someone give me the example of this algorithm [closed]
[ad_1] You should build your code with -Wall flag to compiler. At compile time it will then print: main.c:9:15: warning: ‘coord1’ is used uninitialized in this function [-Wuninitialized] This points you to the problem. coord1 is a pointer type, that you assign to, but coord1 has no memory backing it until it is initialized. In … Read more