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General C++ Programming - August 2017 (Page 2)

How can I write a c++ code based on this algorithm? **I'm new with C++. //Implements the sieve of Eratosthenes //Input: A positive integer n > 1 //Ou...

[1 reply] : The general policy here is that we aren't going to just do your homewo... (by Ganado)

by bstefan96

My c++ program i a lot of slower than my java counterpart

Good day. I have written a program in java and c++ which takes an int list as an input and returns a list of all possible permutations. I used the exact same lo...

[7 replies] Last: you know how many you need, its a given computation... do a reserve on... (by jonnin)

by randym

How to get full path from relative path

Does anyone know any c++ function that I can use to retrieve a full file path from a relative file path.

[2 replies] Last: C++17 / Filesystem TS: std::filesystem::canonical() / std::experime... (by JLBorges)

by Li1

Overloaded oparators

Hi! I don't undstand overloaded operators...can you explane how it works...somebody.. Thanks

[3 replies] Last: In addition to max's excellent summary, the following lecture notes mi... (by gunnerfunner)

by gedamial

Why is SET slower than VECTOR in this case?

Hello. The code below runs faster with a Vector rather than with a Set vector<string>files{ "vocabolario1.txt", "vocabolario2.txt", "vocabolario3.txt" }; /...

[5 replies] Last: Thank you everyone. Line 27 looks through the set, one item at a tim... (by gedamial)

by SOURABH PRAKASH PATI

Set MSB 0

I need to set the MSB of a decimal number to 0 which am taking as input. So i don't know how many bits are there in the binary representation of the number. Ho...

[15 replies] Last: #include <type_traits> #include <limits> #include <bitset> namespace... (by JLBorges)

by richardv

DLL to be called with Unicode strings instead of ASCII (1,2)

Hi. I am using the following DLL in a program that uses the ASCII format for strings : #include <windows.h> #include <string> using namespace std; ...

[28 replies] Last: Hi. Now the DLL works and provides the expected results. Thanks to a... (by richardv)

by oldspiderdude

Program crashes at substr (positions are in range, using string)

Hi, could someone tell me why this program crashes every time when it goes to substr()? The crashing part is at line 70, it is really pissing me off. I've prin...

[5 replies] Last: A few problem areas. Mixing of formatted input cin >> with getline(... (by Chervil)

by John87Connor

assignment of template descendant

hi everyone, i'd like to implement a "node tree": a node can have multiple children, but only 1 (or no) parent. besides the node hierarchy, each node has additi...

[6 replies] Last: i solved it, i just removed the template T as base class and added a p... (by John87Connor)

by PopRockCandy

picking index of unspecified array size

Hi all, my question is how do I pick a specific number from an array which has an unspecified size efficiently? I'm sure I could traverse the array from the beg...

[4 replies] Last: std::cout << "input a number for array size:"; std::cin >> size; ar... (by keskiverto)

by pivot

Reading C++ Source

Recently, a cloned Unreal Engine repo locally to my PC. There are tons of file in the repo, and high quality codes. It's a great pleasure to read professionally...

[9 replies] Last: try https://scitools.com/trial-download-3/ I can't test this, can't i... (by jonnin)

by SSteven

regex to find each 5-letter word in a sentence

I am using the following data string and regexes to find each 5-letter word in a sentence, but I get incorrect results as indicated: string sentence =...

[4 replies] Last: gunner's solution works perfectly. \\b in a regex specifies a word bo... (by SSteven)

by Elia Ashraf

Finding 2 words in array

I have 1 dimensional two arrays each consisting of names of cities and number of items delivered to that particular city. Now I need to find a two letter word ...

[6 replies] Last: As already pointed out by Ganado if your strings have spaces you need ... (by jlb)

by shivamjain1

If else statement using single cout

Write a program to decide the class of family depending on its yearly income using if else with single cout The various classes are : < Rs 50000 very poor 50K...

[10 replies] Last: There are 10 sorts of people: those who like PODs and those who like s... (by Enoizat)

by zaratustra

"Delete" statement not working?

Hi there, Im recently writing a new code where a function returns a pointer, say *myp. Thing is inside this function, the pointer myp points towards an array of...

[7 replies] Last: delete doesn't change the value of the pointer (which is an address)... (by zaratustra)

by SSteven

regex - Finding each vowel in a sentence

I am trying to write a program that uses the regex_search() function to find _each_ vowel in a sentence. The regex_search() function call is as follows: ...

[2 replies] Last: couple of additions that you may wish to consider: (a) std::regex_con... (by gunnerfunner)

by SSteven

regex_search() for digits not working

I have written a small program (based on an example in Josuttis' book) to search for an occurrence of digits in a string: /* The following code example is...

[2 replies] Last: Another option is: regex("(\\d+)") data: Hello this is... (by Thomas1965)

by bcass

GPA Struct

So I can't get my program to run correctly: #include<iostream> #include<string> using namespace std; struct student { int credit ; char grade ...

[4 replies] Last: OMG that worked thank you soo much !! (by bcass)

by VirtualizeThis

Function returning unexpected value

I have a function that should check at array of letters and return the number location of that letter in the array. char CHARSET = { 'A', 'B', 'C', 'D', 'E'...

[5 replies] Last: You could make your code work, but it’s prone to errors. For example... (by Enoizat)

by tario

error: invalid use of non-static member function

I keep getting the compile error: vclPCG.C: In member function ‘virtual Foam::solverPerformance Foam::vclPCG::solve(Foam::scalarField&, const scalarField&,...

[1 reply] : ¿is that openFoam? ¿what part is your code? I need to see more cont... (by ne555)

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