General C++ Programming - C++ Forum

This is to calculate how much 3 monkeys eat in a week. it generates the total amount eaten by all the monkeys, the least amount eaten by a monkey and the most ...

[9 replies] Last: Yeah, I didn't know there was a way to set the minimum to the highest ... (by daveconn66)

by codes4life

comparing strings

Write your question here. How can I compare these two strings and count when the strings are the same? It prints 10 all the time Put the code you need help ...

[6 replies] Last: Thank you for your replies. I have figured out the source code, appare... (by codes4life)

by OmairIqbal95

Any O(log n) find time complexity datastructure that is not a map?

Any O(log n) find time complexity datastructure that is not a map.

[5 replies] Last: How often do you need to add or remove elements from the data structur... (by helios)

by closed account S879Nwbp

std::for_each

Hello, Is std::for_each faster than c++ for and in a for_each statement how can I determine the current value of the iterator and the value of the vector fr...

[1 reply] : Did you look at: http://www.cplusplus.com/reference/algorithm/for_each... (by keskiverto)

by Hitsuki Official

Interesting bug with the pow() function

I tried running the pow function to generate large numbers and I get some weird results. At first I thought it was an overflow issue so I cut it back a little, ...

[7 replies] Last: Or, don't use doubles ... the program is looking for integer powers, a... (by jonnin)

by ayokng

qualified name is not allowed @hash::NumberOfItemsIndex

Solved by putting everything in one class. Best solution I could think of hope it helps someone I keep getting an error saying qualified name is not allowed...

[2 replies] Last: Yeah it was a typo Hmm the issue is with GUI version I'm making. it w... (by ayokng)

by mcf3lmnfs

using template to pass aditional argument

I need to pass a (function with one argument) as an argument to another function, this another function is fixed - can not be changed becasuse it is already w...

[6 replies] Last: 1. In arduino environment IDE appernetly there shoulnd not be a line b... (by mcf3lmnfs)

by clauderobi

Bug in std::streambuf::in_avail ??

The following code: std::stringstream test; std::streamsize dataSize; test << ""; dataSize = test.rdbuf()->in_avail(); cout << "Available cha...

[6 replies] Last: if a stream has data, but the data is not buffered in an object (gptr... (by Cubbi)

by closed account E0p9LyTq

Compiling C++, Visual Studio vs. Code::Blocks output

I personally like the information VS 2017 Community outputs when compiling a simple C++ program: #include <map> #include <string> template<typename KeyT...

[no replies]

by nsi

Create Big Multi-d Array w/o Causing Memory Issue

Dear C++ programmers! I have been trying to create a big multi-d array but each and every time there appears memory issues. Here is what I have tried. (1)...

[6 replies] Last: There is nothing wrong with visual studio. I have used it on large pr... (by jonnin)

by Carrie Aeris

Velocity Program not working

I can't seem to get this program to work. Every time I compile it, it gives me "The velocity is 78321 cm/s" #include <iostream> #include <iomanip> us...

[2 replies] Last: Thank you so much. :) (by Carrie Aeris)

by tracyvo105

Help reading the file

This is the text I have: Princeton University NJ Princeton 41820 8014 0.0740 0.98 0.97 Harvard University MA Cambridge 43838 19882 0.0580 0.97 0.97 Yale Unive...

[3 replies] Last: After you read "temp", you still have the \n remaining in the buffer. ... (by doug4)

by daveconn66

NIM Game

sorry I removed the code because the instructor of the class I am in wanted me too.

[4 replies] Last: OMG!!!!!!!!! it was one semicolon!!!!!!!!! Thank you very much! I r... (by daveconn66)

by zaphraud

Mandlebrot set zoomer...

Text mode nostalgia. What should I do with it next? #define LOOPS 1000 #define ESC 27 #define XSIZE 128 #define YSIZE 40 #define DELAY 1000 #defi...

[no replies]

by d1g1talarts

Comparing lists of strings

I need to count the number of strings that occur in the first list, but not the second list. This is what i have // pre: A and B are sorted. // post: The...

[6 replies] Last: From file. Disallowing (or assuming no) repeats. #include <iostream> ... (by lastchance)

by noel3

Crazy IDE Pointer programs problem

When I create a program with pointers...then close and create a second program...then compile and run the NEW program, instead the OLD program runs that I close...

[5 replies] Last: A good and free Windows IDE is Visual Studio 2017 Community. A good c... (by closed account E0p9LyTq)

by skyfall009

boost date-time conversion error

date dt{2018, 5, 14}; string str = to_simple_string(dt); cout << str << endl; error : undefined reference to `boost::gregorian::greg_month::as_short_stri...

[1 reply] : "Undefined reference" means that when the linker went looking for the ... (by Repeater)

by Saptaparnee

How can I take an input from a 2D array into a vector

Hi, I have an an array of integers lets say: 1 2 3 4 5 6 I want to take the input from this array into a vector of vectors say: vector<vector<int> > ...

[3 replies] Last: Exactly the same way you have the 1D row vector. Three numbers is thre... (by keskiverto)

by JUAN DENT

How can I find if a type is an instantiation of a certain template, like say set?

Hi, Now that we have constexpr if, can we find if a type is the specialization of a certain template (say: std::set<int> s; // or std::vector<int> s...

[2 replies] Last: Thanks!! Juan (by JUAN DENT)

by ggrules

Can anyone explain this BUG and how to fix it?!

So,if you were to run the program, after entering the file name again after the file had been created... before the menu is shown it seems to display my create ...

[5 replies] Last: Sorry, yeah that was comment... just ignore that haha (by ggrules)

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General C++ Programming - March 2018 (Page 3)