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General C++ Programming - July 2019 (Page 4)

Include debugging feature in makefile

Hi, I would like to add a debugging feature in a makefile (flag -ggdb of g++). A quick and dirty solution worked only partially. Debugging was possible but th...

[2 replies] Last: Works nicely! Thanks!! (by pfannmoe)

by nurulhudaismail

extract diagonal elements from a matrix

Hi, I would like to extract elements from the main diagonal and a diagonal line that is 1-step after the main diagonal and 1-step behind the main diagonal of m...

[4 replies] Last: Thank you for your help. (by nurulhudaismail)

by adam2016

class scope

Hi guys, in terms of scope , getPersonOne is valid, getPersonTwo is invalid or can cause undefined behaviour, but getPersonThree in Person this is tricky, so...

[6 replies] Last: As @coder777 pointed out, I made a mistake in my code example - I got ... (by Niccolo)

by zakinithos

Simultaneously sorting Vector elements alphabetically and ignoring integers in sort.

I am attempting to sort a vector of string elements in alphabetical order, outputting them using an iterator. The Vector elements are in the following format: ...

[7 replies] Last: My lips are sealed. I hope the llama survived. (by dutch)

by Fujitsufan

Convert xls file into a xlsx file

Hello, Is it possible to convert a Excel file from *.xls into *.xlsx in C++? But not in C# using .NET Framework. And without using instances of Microsoft ...

[8 replies] Last: BTK anyone? Foiled by metadata! pretty much lol. Take a look though ... (by jonnin)

by rafiqkhan

My program shows function declared as void

WritMy program shows function declared as void .The program is about library system . User can enter books ,cost and auther name and book id and after entring d...

[2 replies] Last: Also, at line 75, an | is the bitwise OR-operator. If you want to ch... (by nuderobmonkey)

by hjabba89

Need help encrypting/decrypting a sentence. ascii

Write your question here. c++ ascii issue. I am only able to encrypt/decrypt 1 word and my assignment is asking my to do the sentence "MEET ME AT 8." I don't k...

[2 replies] Last: Salem c is right, "cin" is splitting the sentence you input for each s... (by Zaap)

by kitfox

How to create list of classes at compile time?

I'm trying to figure out a maintainable way to have an XML loader be able to lookup loaders for subsections of a document based on a string key. I have a dat...

[5 replies] Last: Thanks for your suggestion, Niccolo! This is exactly what I was looki... (by kitfox)

by nurulhudaismail

calculate average of a diagonal line of complex matrix

Hi, I would like to calculate the average of the diagonal elements of a matrix. May I know which part that I need to do a correction? I have no idea why the div...

[4 replies] Last: Thank you so much . It works. (by nurulhudaismail)

by philip92

Getting an error while initializing the size of an array

I have a following function "arrayMerger" and I want to add up size of two arrays and then assign its size to another array but I got an error as "expression mu...

[3 replies] Last: The standard library has std::merge() https://en.cppreference.com/w/... (by JLBorges)

by nurulhudaismail

How to add a diagonal elements of a complex matrix ?

Hi, I would like to add the diagonal elements of a complex matrix. Unfortunately, it only computes the sum of the real part only, while the ima...

[2 replies] Last: Thank you. I am sorry for this silly mistake. I admit that I checked... (by nurulhudaismail)

by LeFanDOst

Undefined reference with namespace, can you help me ?

I'm creating an app which need the creation of a namespace, but I've a beautiful undefined reference at the first compilation when I'm using this namespace in m...

[2 replies] Last: Thank you a lot ! I missed this error :( (by LeFanDOst)

by Zaap

Crazy encrypting algo (1,2,3,4)

I made a server/client network program with encrypted communication. I generate a key (ex: 49523851). (Actually it's four keys that I concat in one). To ...

[61 replies] Last: This is not help, Zaap. It's self-help. One day I can start socket pro... (by Emil Enchev)

by natasha1204

Competitive programming

can someone help me solve codechef long problems please? :(

[10 replies] Last: I'd stay away from codechef. To me, those problems are really contrive... (by jonnin)

by Pararera

Passing array to function

Hi guys, How I can pass array of one type(lets say uint8_t) to function as parameter with different type(lets say uint64_t)? I'm trying to make function that wi...

[4 replies] Last: > I'm trying to make function that will split array of values into byt... (by JLBorges)

by steph111

Help

I need a help, I don't know what to write in int main() in this program to get array and sum of frist r elements: struct FenwickTree { vector<int> bit; ...

[1 reply] : First, please use code tags. They make posted code easier to read. See... (by keskiverto)

by primem0ver

Compilers, bit operations, and data alignment

Lets say I have some struct compiled for a 64 bit processor: struct MyStruct { __uint32 d1; __int32 d2; __uint64 d3; }; I know that sizeof(MyStruct) will...

[7 replies] Last: Thanks everyone for the info. It was helpful. One last question thou... (by primem0ver)

by vroll

Binary Search not returning properly

I'm trying to do a binary search that returns the location in a vector, given the element content. (EX. i = 4, given 4 the program returns 0.) int findElemen...

[2 replies] Last: you make recursive calls, but don't use their result also, the index i... (by ne555)

by itsArtem

Should = default constructor be noexcept?

If I make a constructor = default : Object::Object() = default; should I mark it as noexcept ? Object::Object() noexcept = default; ...

[2 replies] Last: The defaulted default constructor is implicitly non-throwing unless -... (by mbozzi)

by javyesco

pushback error using vectors

would appreciate som wisdom on why the code has an error on a pushback function. all help or info on how to resolve is welcome. ERROR IS ON LINE 178 //HEADER...

[2 replies] Last: rioLoc should be a vector of strings. What this function should do is ... (by javyesco)

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