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General C++ Programming - January 2020 (Page 3)

What is the etymology of the keyword "virtual"?

In D&E, Stroustrup mentions the name "virtual" is borrowed from Simula, but doesn't go into more detail. How does the word "virtual" connect to dynamic dispatc...

[5 replies] Last: The lens may make the person appear upside down and very close, but i... (by againtry)

by marhuum

studying variadic fails

amid studying variadic, I fail to understand why this can't work template <class T> struct Accumulate { T s=0; Accumulate(){return;} template <class H, ...

[3 replies] Last: There's a huge risk to me of this being called "fatuous", but hey-ho,... (by againtry)

by julie2019

C++ at the end of 2019

Let’s reflect on how C++ changed during 2019! What were some significant events, how the Standard progressed, how tools changed and many more. Let’s have...

[no replies]

by yabi2943993

Last digit of factorial (TLE)

I just made a program to calculate the last digit of the factorial of an int: #include <iostream> int main() { int casos; std::cin>>casos; ...

[10 replies] Last: I guess that it's happening near powers of 10. Then the factorial is e... (by lastchance)

by yabi2943993

Ascending numbers

I want to make a program which should read a number n, which describes, how much numbers are goig to be read by the computer. Those n numbers have to be read i...

[1 reply] : #include <iostream> int main() { int n; std::cin >> n; ... (by dutch)

by Norej

error check is not working properly

okay so i have an input file and it is filled with data like so 2 200708211245 F70.5 200707210821 C19.97 I need to error check so when a negative Celc...

[1 reply] : ignore the function prototypes at beginning (by Norej)

by closed account 1bfSwA7f

c string not printing

hello, I was wondering why my c string from my array was not printing? code: #include <iostream> #include <iomanip> #include <string> using namespace std; ...

[3 replies] Last: tttt (by closed account 1bfSwA7f)

by thatoneguy64

need help creating hollow triangle using for loops

for a school project i have to try to make a hollow triangle whose size is based on the user's input. so far i have a good portion of it down but for some reaso...

[4 replies] Last: Using your editor and a fixed-width font, create a file containing a c... (by dhayden)

by mlanuri10

Understand of "quasi" external sort

How can I sort these 120 integers with only 20 integers at a time by using a "quasi" external sort? I don't understand how to code this. CODE/DIRECTIONS: So...

[9 replies] Last: Ok, that's helpful. Thanks for the information. (by mlanuri10)

by vaderboi

Call of overloaded constructor is ambiguous

When I try to instantiate objects of class Foo in main() of foo.cpp, I keep getting errors about how the call to the overloaded constructor is ambiguous. The co...

[12 replies] Last: @Enoizat- I didn't think about "const". That qualifier would definitel... (by vaderboi)

by NorbertMueller

Copying closure of lamda expression

Hello, If you think this is a beginners question feel free to beat me for not using the correct forum :) Consider the following code: #include <iostream> #i...

[11 replies] Last: OK. Thank you who responded. I was thinking, a lambda is a function ... (by NorbertMueller)

by closed account ozh0oG1T

3 number Random generator

Hello!! I’m currently struggling on my program with changing the function of getNumbers() . What I need my program to do is generate 3 random numbers ranging...

[9 replies] Last: #include <iostream> #include <random> #include <ctime> using namespac... (by lastchance)

by BBrandon

Finding a lexicographically minimum permutation

I want to make a program that finds me the lexicographically minimum (basically where all of the numbers are not dupilcates and are integers above 0, and you wa...

[16 replies] Last: Yeah, I had a sh!t-load of memory problems which I've solved but not p... (by againtry)

by Norej

create a human readable output file with char arrays

The program must be able to work for an input file that contains following information: # of temperature readings timestamp temperature [# of temperature ...

[4 replies] Last: It's now up to you to convert what's in the buffer each time to format... (by againtry)

by jsanti2519

Solved Sudoku Puzzle (Need help)

Hey guys I need some help identifying the error in my program, as I'm using nested loops to print out a 2-D array of a solved Sudoku puzzle. I was trying to fig...

[3 replies] Last: Line 13. What makes arr so special that it doesn't need to be checke... (by dhayden)

by Aaron Vienneau

Broker Chain

Hi, I'm reading Design Patterns in Modern C++ by Dmitri Nesteruk (I'm not sure I can recommend it, but I bought it, so I should read it. Its chock full of er...

[1 reply] : I might have seen something of this nature with a message filter; the ... (by Repeater)

by Doraonroids

Using execution file vs debug

The git hub for my project is: https://github.com/Doraonroids/Pucker I'm using visual studio 2019. When I debug the code using VS it runs just fine. When I g...

[2 replies] Last: ^^ The above is a common issue as VS sets up paths for you when you r... (by jonnin)

by james999

It is not detecting any syntax errors but it just ends instantly.

//******************************************** //File:wk1_change.cpp // //Summary: a program that whan given an amount of change will tell you what coins wil...

[5 replies] Last: Type: System("pause") or cin.get() This worked for me, so I hop... (by b p t)

by Norej

project dealing with char arrays

YYYYMMDDHHMM (e.g. 200708201425) This should be converted to: 08/20/2007 1425 i need to convert the above char array (200708201425) to an actual time s...

[8 replies] Last: For a one-off timestamp I wouldn't need base, and I could initialise b... (by lastchance)

by bibo

Segmentation fault:11

vector<int> solve(vector<int> arr, vector<int> queries) { vector<int> res; int n = arr.size(); int q = queries.size(); int col = log(n) / log(2...

[5 replies] Last: Thanks it worked :) Thanks for using code tags. :) And note that dh... (by dutch)

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