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General C++ Programming - June 2021

Sort an input file for a specific value

Hello, I am trying to sort an input file by a specific value (price), then print the sorted list to an output file. Example input text (how it it formatted in...

[9 replies] Last: Thank you everyone. I was able to finish the project. (by Fayezilla)

by GroovyJack

Help with partial match peg counter in Mastermind game C++ code

Like the title says, I am coding mastermind in C++ have already completed it, the counter pegs are gold for a pure match, and silver for a partial match. I have...

[4 replies] Last: #include <iostream> #include <vector> using namespace std; template... (by dutch)

by SirEnder125

Reading binary file data into struct object?

Hello. I do not know if it's the right way to do this, but I have this code: #include <iostream> #include <fstream> typedef unsigned int u32; typedef uns...

[5 replies] Last: How did you write the information to the file? You really shouldn't b... (by jlb)

by Borneq

Smart pointers and trees

I have Node: int level string name Node* parent std::vector<std::unique_ptr<Node>> childs; I create Node with level and depend on level, link to last node ...

[4 replies] Last: Perhaps something like (NOT tried); #include <memory> #include <str... (by seeplus)

by coder777

Why do I need to use “pointer to pointer” in this situation?

why I have to use "pointer to pointer" in the function "InsertAtFront" This is the reason: (*head) = newNode; You set the head pointer to newNode . If ...

[5 replies] Last: OP is a spammer. Yeah. The original post has now been deleted - wh... (by seeplus)

by JLBorges

Concrete types - as described by Stroustrup - C++ Programming Language 4th ed

In my understanding: A type whose 'representation is part of its definition' is a type for which we can use value semantics. For example std::string A type...

[2 replies] Last: Sadly this question is another re-post. Wait for the edit and spam. h... (by lastchance)

by lastchance

How to append text to a text file in C++?

Dratted re-post bot: original question from https://stackoverflow.com/questions/2393345/how-to-append-text-to-a-text-file-in-c #include <fstream> using namesp...

[1 reply] : See under mode in http://www.cplusplus.com/reference/fstream/ofstream/... (by seeplus)

by JLBorges

Is there a standard definition for __cplusplus in c++14?

__cplusplus denotes the version of C++ standard that is being used, expands to value 199711L(until C++11), 201103L(C++11), 201402L(C++14) , 201703L(C++17)...

[3 replies] Last: why does OP have a link to walgreens? Looks like a low quality spam o... (by jonnin)

by cmisip

How to make base class use derived class overloaded method

Is it possible? If I derive a class, then override one method, is there a way for the base class to use this method? class Base{ void writebyte(){}; ...

[4 replies] Last: It's a publicly available arduino library called TM1637_6D. I derived... (by cmisip)

by shokoro10

i need help

After level 5 lockdown, Rose, Rebecca and Rachael (three friends) realized that they had gained much weight. Therefore, they decided to do exercise activities...

[9 replies] Last: PLEASE ALWAYS USE CODE TAGS (the <> formatting button) when posting co... (by AbstractionAnon)

by Gladys994

How do i censor specific words in a string?

#include <iostream> #include <iterator> int main() { std::string vect = "one two nyes four nyes five nyes six"; std::string ban = "nyes";...

[4 replies] Last: Hey Einsteins, it's a two-year-old account blatantly posting spam. (by Ganado)

by johnny5947

difference between char array and string in cplusplus

I need to know the difference between character array and string in c++. Can any one answer to this? Thanks in advance. https://www.mybalancenow.b...

[1 reply] : https://duckduckgo.com/?q=difference+between+character+array+and+strin... (by salem c)

by cmisip

Can a struct in a vector access its index in the vector?

I am building a vector of structs. The struct will contain a data member which is a pointer to an array of double. I need to have the struct member pointer to ...

[13 replies] Last: You're right. There's not much to gain going down this road. The sim... (by cmisip)

by suckss

Dynamic array of char arrays

The title might seem a little confusing but I'll try to explain. I have a struct and I know I'm getting a certain number of char arrays, which have a constant s...

[8 replies] Last: that will cause you some troubles. If you leave off the space for th... (by jonnin)

by gustafssonsami

Trying to print adresses of 2D dynamic arrays

I've created a program that is able to create a staggered 2D dynamic array. I pass this array to function and try to cout it's "childrens" memory locations in t...

[1 reply] : arr is the value stored in the i'th element of arr . That means i... (by MikeyBoy)

by gevCplus

Find the first two consecutive pairs in the vector with greatest equal second (1,2)

One last question regarding vector of pairs. Suppose we have a vector of pairs like the following: V { (1,10) (4,20) (3,50) (6,40) (8,50) (10,30) (7,40) (12,5...

[24 replies] Last: Well, I finally managed to run the code on Wandbox: https://wandbox.or... (by lastchance)

by technologist

detect mouse cursor position in a particular window

Ok, so how do I detect mouse coordinates in a particular window ? detect mouse coordinates give general screen coordinates of the entire screen: POINT p; ...

[1 reply] : Try ScreenToClient: https://docs.microsoft.com/en-us/windows/win32/api... (by dutch)

by saltyyyyy

aggregation relation

Why the case 3 cannot display? class Item { public: string itemName; double totPrice; double itemPrice; int quantity; //Item(){} ...

[14 replies] Last: Well if you made Payment have a pure virtual function, you can't decla... (by Ganado)

by sergeyutkin221

I'm given a sequence containing from 3 to 30 words. Printing all words that occur more than once in the sequence.

I'm given a sequence containing from 3 to 30 words, each of which contains from 1 to 5 capital Latin letters; between adjacent words - a comma, after the last w...

[4 replies] Last: if Xcode lacks a friendly debugger, then just insert some print statem... (by jonnin)

by sergeyutkin221

Implement an array-based stack and count what is more in the stack

Implement an array-based stack and count what is more in the stack - vowels, consonants, or other characters. Then implement the stack based on the linked list ...

[4 replies] Last: How can i do this in Xcode? (by sergeyutkin221)

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