General C++ Programming - May 2019 (Page 7)

Hello, who can help me. I need one preprocessor macro. Input: Name result: Modulename_Name #define __FILENAME__ (strrchr(__FILE__, '/') ? strrchr(__FILE__, ...

[5 replies] Last: ...and in C++17, you should be using filesystem::path for this kind of... (by Duthomhas)

by johnsonj1585

2D Array Puzzle

Good evening, I am working on my final project for my C++ class and have run into a snag with my program. There seems to be a problem with my array and const i...

[5 replies] Last: Lines 23, 42, & 63: You've defined scores 3 times with 2 different t... (by dhayden)

by XTC1977

Code applies wrong value in certain situations

I have a code section that was updated to write to a single bit in a file a flag of 1 or 0. A 1 = speed is in a 5ph increment, i.e. 55mph. A 0 = speed was divis...

[5 replies] Last: A 0 speed value is a valid value and seems to be part of the cause he... (by dhayden)

by YeetParadox

Poker StraightFlush and FourofaKind

#include <iostream> #include <cstdlib> #include <ctime> #include <vector> using namespace std; string r ={ "Two","Three","Four", "Five", "Six",...

[10 replies] Last: You don't need to sort to check for a flush. Just check if all cards h... (by dhayden)

by Joseph118

Sub-Namespaces for organizing features: Yes or No?

I've been working on a personal library called J118 for a while now, and it's starting to gain in size. It's just a personal project I do for fun and to learn n...

[9 replies] Last: Documenting dependencies. That is something I hadn't considered. Tha... (by deleted account xyzzy)

by cpeepee

Help with HashMap / typename declarations

I am working on a HashMap to learn C++ and I am using iterators and const_iterator classes to go through my HashMap. I am also using vector/list and pair to rep...

[1 reply] : The compiler doesn't know that std::list<std::pair<key_type, mapped_t... (by Peter87)

by NiharRNanda

Unary Opeartions Inside Ternary Operator

Hi Guys , As per the operator precedence table, unary operators have a higher precedence over ternary operator,then in the below given example ,why this rule ...

[6 replies] Last: Thanks everybody for your explanations,I got it . ne555 thx for usi... (by NiharRNanda)

by slei

Working with ptr to items in containers, thoughts?

I recently see my self often trying to take pointers from non dynamic allocated objects from smaller containers, and it seems to work fine. for example std::...

[5 replies] Last: By reading it, this would mean it is actually safe, and wouldn't inva... (by mbozzi)

by zaahm18

Matrix and vector multiplication in different classes

I want to calculate the matrix multiplication with a matrix and a vector. the matrix and vector have their own class files, and I want to multiply a vector wit...

[4 replies] Last: The real problem is the manipulation of matrix and vector in vector cl... (by zaahm18)

by whitenite1

Comparing 2 literal strings

I saw a member asking about a game like 'Boggle', and thought that sounded like a nice project to write. I made a struct to hold the words in a dictionary.. (3...

[4 replies] Last: @JLBorges Thank you for your answer. I did forget to put in the '== 0... (by whitenite1)

by Ryan15

Is there another way to stop this do while loop mid-loop?

without the break statement, the output would exceed 100 once before it stops. eg: Multiply= 5 Multiply=25 (this is where the break statement would h...

[7 replies] Last: I thought it was about the actual result of multiply and not just what... (by Ganado)

by Ojies

Input loop always does first option

There is a loop from lines 750-970 that has 2 options in an if statement for when you input a string for the variable "input". When it asks you to input somethi...

[4 replies] Last: Shouldn't the syntax be something like this in your 'if' statements ?... (by kavala)

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