General C++ Programming - C++ Forum

i want to improve my program -- what questions could/should i ask myself during the re-write?

tl;dr - i want to adopt good coding habits now. the below code was written under tight constraints. we don't do assignment post mortems in class to discuss "r...

[6 replies] Last: I think the last part should be ++i. or the other way around? Oop... (by andywestken)

by AnupamBisht

Error :invalid types 'Double[int]' for array subscript

Hello, I am a beginner.I am getting 2 errors.Please help to solve them. The program first takes the readings ..then gives the average .After that it subtracts t...

[2 replies] Last: Also there is code tags (looks like <> on right of post creating/editi... (by MiiNiPaa)

by closed account 4jzvC542

help how to write code

i have given following exercise in my cpp book: Determine the roots of quadratic equations ax^2 + bx + c = 0 using formula x = -b +(plus-minus) (roo...

[6 replies] Last: Good.... i impressed..... (by Monicaceys)

by Matt Simon

UTF-8 String and Hash calculation

I use ATL and Visual C++ to write my program. I have need to POST certain form data to a web site. Since this is a banking/financial web site, they require the ...

[no replies]

by JChMathae

Template specialization

It seems that the following construct is valid: template<bool b> class TOTO {}; template<> class TOTO<false> {}; template<> class TOTO<true> ...

[3 replies] Last: Your question was about inheritance from different specialization of t... (by MiiNiPaa)

by Andranos

Unresolved external problem lnk2019

Hey guys, I'm struggling with these problems I got a lot of unresolved external errors 1>game.obj : error LNK2019: unresolved external symbol "public: __thi...

[5 replies] Last: http://stackoverflow.com/questions/219381/how-to-exclude-files-from-vi... (by MiiNiPaa)

by SuperStinger

Quick int for loops

Quick question! Is this... for ( int i = 0; i < 10; i++ ) { ...blah blah code... } the same as this... int i; for ( i = 0; i < 10; i++ ...

[8 replies] Last: Thanks very much guys, ill take that into consideration when writing m... (by SuperStinger)

by I 8 Crayon

HELP- not saving keystrokes to the specified location

Here's my code, my problem is that it is not sending the keystrokes to the LOG.TXT file I want them to be going to. What am I doing wrong? 1 #include ...

[1 reply] : When you find yourself using multiple if else-if statements means it i... (by Smac89)

by closed account 4y5Ly60M

Compiler? Microsoft Visual Studio C++ 2010 / Code::Blocks

Good evening "my time" . I would like to compile my programs for "any OS" Windows/Unix etc. which would be the best IDE, I hear that VS C++ 2010 is windows pr...

[3 replies] Last: Thanks for your quick response, I decided to use Code::Blocks. I like ... (by closed account 4y5Ly60M)

by Neeru

Significance of assigning a number using bitwise operators

Hi, can anyone let me know the difference between at performance level, if any, between the following cases, during assignment? case 1: #define Value_16 1...

[2 replies] Last: Only a few nano seconds faster during _compiling_ using case #1 vs. ca... (by chuxnorth)

by closed account Dy7SLyTq

Choosing input streams

So I built an interpreter for a language I made, but I can't get the streams right. I have an istream pointer and if they don't supply a cmd line arg, it refere...

[1 reply] : //std::istream *pointer; pointer = new std::ifstream(filename); if (... (by helios)

by Mats

Finding a specific instance of a class

So I have a class that is like this: class card { public: int id; int val; }; card card1; card1.id = 1; card1.val = 2; card card2; card2.id = 2...

[3 replies] Last: Your code fragment and question suggest you are a beginner? In that ca... (by andywestken)

by CSCImajor18

VERY SIMPLE!! Won't run correctly

#include <iostream> #include <string> #include <iomanip> using namespace std; //Create a simple C++ program to: // 1. Ask the user for name // 2. ...

[1 reply] : You need to use a string for the username, not an integer. Also, take ... (by Mats)

by begack

Output 2 text files

Hey guys, so I'm trying to output 2 different text files, one has customer names and the other has items they are selling. I gave each customer an ID and eac...

[2 replies] Last: So would you read the files the same and then put them into vectors? O... (by begack)

by andrewsaad

data structure question

void weightedGraphType::shortestPath(int vertex) { for (int j = 0; j < gSize; j++) smallestWeight = weights ; bool *weightFound; we...

[3 replies] Last: I mean `Project 7 ch.12 - 3.exe', the executable. And the object files... (by ne555)

by Snaksa

Mobile programming

Hi everyone! I'm asking here because maybe you will know the answer of my question. I want to make mobile apps (mostly for Android), but I don't know how. Shoul...

[8 replies] Last: You can use Marmalade (mainly a C++ framework),it supports both IOS an... (by Awareness)

by ClydeWilliams

How to add to a vector of vectors

In my program i'm trying to have a function that returns a possible set of moves for a knight chess piece to move based off of its current position. Here's what...

[1 reply] : std::vector<std::pair<int, int>>temp; temp.push_back( std::make_pair(... (by vlad from moscow)

by sever

Pointer to method problem

Hi guys, Could you please help me to correct this example code ? --- #include <iostream> #include <string> #include <map> class HiddenFunc { publ...

[2 replies] Last: That's it !!!... Thanks ;) (by sever)

by BSODMASTER

Brute-force attack algorithm

So basically I want to test all combinations of characters in fixed size string passing them into Hashing function and testing the result with the target hash. ...

[1 reply] : Main idea: bool next(std::string& x) { size_t len = x.size(); ... (by MiiNiPaa)

by martianxx

Creating a custom filetype

Hi, I am making a level editor that needs to output a custom map file for use with source code that I will write for a graphics library. My question is: What...

[3 replies] Last: [quote=martianxx]" Also how can I encode a standard bitmap image into ... (by closed account zb0S216C)

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General C++ Programming - May 2013 (Page 12)