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General C++ Programming - September 2017 (Page 10)

Pointers and a problem to solve with them

Hello, I have a question regarding pointers, the written code and wish to understand where I might be doing it wrongly as I'm not getting what I'm supposed to. ...

[19 replies] Last: Thank lastchance & kemort. Now I have two programs working. (by aurimas13)

by technologist

general fx callback question

Does a callback function in c/c++ require monitoring in a loop to keep it alive, or can one "fire and forget" by having it interrupt when triggered without bein...

[1 reply] : It depends entirely upon the event mechanism. Some callbacks require r... (by Duthomhas)

by elisatih

Access element of Vector

Dear all, I use this code in my research, vector<RoutingPacket> bufferAggregate; class RoutingPacket: public::cPacket {} class LeachRoutingPacket: public::Ro...

[19 replies] Last: eureka... this code, changing *netPacket (remove the encapsulated pac... (by elisatih)

by asdfcxz

please help with switch loops

So i am trying to have the user input a letter, then use a switch loop to determine what number on the phone keypad the letter corresponds to. Then i want to p...

[2 replies] Last: @wildblue hahaha shit idk how i fucked that one up thank you (by asdfcxz)

by DragonOsman

PPP2 Chapter 16 Exercise 8 - Help Needed

You can find the code on the PPP Google Group, here: https://groups.google.com/forum/#!topic/ppp-public/2_B1w8V0DKw . I've attached the .cpp file and also the ...

[no replies]

by shivamjain1

How to read from file in c++

myFirstfile.txt has 4 numbers 4 5 6 7. I am not getting any output. Instead I am getting blinking cursor. I want the numbers from file as output. Please help ...

[2 replies] Last: Thanks. got it. (by shivamjain1)

by aurimas13

Simpson's rule question

Hey guys, I know that Simpson's rule has to be applied for even n rectangles, however in my assignment I am asked to calculate in 7 rectangles between a = 0 and...

[14 replies] Last: Thanks again kemort. (by aurimas13)

by UmairAli

Want to learn Everything in c++

hey ? i am new here and i hope this thread wuld be in the right section , the purpose of this thread was umm i know its a dumb question to ask but i really wan...

[2 replies] Last: Thanks for the reply buddy :) and also for the links repect + (by UmairAli)

by mariana09

Need help with simple programming

write a C++ program that will calculate the miles per gallon a car gets given the gallons of gas used and the total miles driven. Assume that the car holds 15 ...

[15 replies] Last: Why do you keep deleting your code? It makes this thread useless as a... (by MikeyBoy)

by SkinnyBruv

Creating a recurring number program from a file (Soon to be more)

Howdy guys, This is the first time ive posted in cplusplus.com, and im quite glad i've gotten this far (Since learning a new program is fkn hard). The program...

[4 replies] Last: #include <sstream> int data_2 {0}; std::stringstream i... (by closed account 48T7M4Gy)

by aneurysm

Need Help Searching Array

Menu driven program. Function is to allow the user to enter a fruit type and display the price. Data is loaded into the arrays from a text file and I have alrea...

[4 replies] Last: @aneurysm http://www.cplusplus.com/forum/beginner/220979/ Don't dupl... (by closed account 48T7M4Gy)

by shivamjain1

\t giving more space in c++

Why is the output showing more space between the words "10 years" and "15 years" despite giving only single \t as between other words. #include<iostream> us...

[7 replies] Last: I used setw to add spaces manually and got the desired output as shown... (by shivamjain1)

by JUAN DENT

How can I test that a construct must not compile?

Hi, Say we have a three element maximum MPL style sequence (as in the tiny type in the book C++ Template Metaprogramming). I want to place a test that fails (r...

[6 replies] Last: I'm guessing a bit: # include <type_traits> # include <utility> tem... (by mbozzi)

by meikebuettner

Not getting any error messages but...

my output is completely wrong! I'm totally not sure why this is or how to fix it.. #include <iostream> #include <iomanip> #include <string> using nam...

[2 replies] Last: ... (by ne555)

by paraxod

Counter object that declared only in the base class but used in every derived class separately.

Suppose I have a class which represents kind of protocol for other classes that inherited from it: //Protocol.h class Protocol { protected: //each...

[9 replies] Last: But if I chose to increment counter inside the constructor of each cl... (by mbozzi)

by Tontonbaboum

For loops: definition of int as local or global

Dear all, I am creating a class, for which some methods include loops and double loops of the form: for (int i = 0 ; i < L1 ; ++i) { ... do_some_cal...

[2 replies] Last: Great, that answer the question. Thank you for the reply. (by Tontonbaboum)

by olfibits

Qt Sound problem

Hello again, I'm now working with Qt to develop GUI application. My current project is a cross-platform timer application. The GUI prompts the user to set...

[5 replies] Last: Executing qmake helped to build the EXE, but QSound doesn't play the s... (by olfibits)

by Kiryu

My code is a mess

Hey, as the title suggests, I have a problem that often holds me back from continuing my projects, and that is my code! Before I continue, the most important...

[no replies]

by ArchRon1n

Cannot get correct output from separate file.

Please if possible can anyone improve my code. This project is due in two days time. So basically what I need is: 1. for users to input the item they want and ...

[5 replies] Last: See that's the problem I know for sure there is a problem within my co... (by ArchRon1n)

by Brandon i

Metric tons program

I know this form says no home work aloud but I need help I can't figure this out. The program I'm trying to make is that it need to prompt the user to enter the...

[6 replies] Last: What are you confused about? It's a user input and printing out comput... (by Hengry)

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