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General C++ Programming - May 2014 (Page 5)

Overloading versus template specialization to determine behaviour

When using templates to determine the behaviour of a function or class (e.g. if you test type traits), is there any particular disadvantages and/or advantages t...

[1 reply] : http://www.gotw.ca/publications/mill17.htm (by cire)

by xuinkrbin

vsprintf-like function for strings?

I am trying to create a function like so: void out(std::string format, ...) { va_list args; va_start(args, format); std::string formatted_string = v_for...

[17 replies] Last: Adding to what JLBorges says about macro's and 'printf', defining 'pri... (by xuinkrbin)

by shahmicky

programing in ubuntu

hello friends .. how to use graphics in ubuntu(terminal). or how to use Linux command in c++ program.

[14 replies] Last: Understand that all the answers have described how to "use graphics" u... (by Lachlan Easton)

by robkar32

Get past cout.

So.. I've watched a bunch of tutorials on C++. Most of them teach me the basics with printing things out in the console. Arrays, pointers.. etc.. I've learned a...

[2 replies] Last: I'd like to learn software developing in general. Calculators, browser... (by robkar32)

by BruceJohnJennerLawso

Baffling issues with object variables going to NaN

Hello, So I am trying to develop a sort of 2d spacesim engine for creating games in C++. The project uses SFML for graphics, and I am currently trying to com...

[2 replies] Last: Thats part of the problem. The vessel objects are polymorphic, with an... (by BruceJohnJennerLawso)

by nines

Get the wanted result with given numbers

Hi all, I'm looking all day for algorithm that sums all given numbers to match the result. For example : user input : (6 numbers) 2, 5, 3, 5, 20, 100. And wa...

[1 reply] : This seems like a generalization of the game "24", which in turn seems... (by long double main)

by Bingocat4

Attraction between objects

How would I make it so one thing is attracted to another? Not being attracted from far away, but very attracted up close. I can't really find anything on google...

[5 replies] Last: Oh I see what you're saying now, I misunderstood. You could do someth... (by closed account 2UD8vCM9)

by DeathAngle

Auto Run

Some of you may know how auto run has been disabled in Windows 7 and so I was wondering if it is possible to make a c++ program that will enable auto run or som...

[2 replies] Last: nvm I figured out how to do it using a batch file, if anyone else is i... (by DeathAngle)

by tiekacho

deciphering an unknown shifted caesar cipher text file

Hello every one, I have spent the past week working on this assignment and i'm hoping to get some help on what I need to do to correct my sift and get it to pr...

[5 replies] Last: If the code that reads the input file the first time works then use it... (by dhayden)

by superfury

VGA display memory mapping?

How is the memory written to a frame of memory (0xA0000-BFFFF) mapped onto display memory (0-256k)? I've implemented simple mapping using the write and read mod...

[no replies]

by p33n kenan

rand() gives the same number everytime

hello, I have a problem with the: rand(); function. It keeps generating the same number over and over again. I use it like this: switch (mode) { ...

[6 replies] Last: thanx (by p33n kenan)

by dleanjeanz

Getting "Error: incomplete type is not allowed"...

...when declare and assign an instance of a user-defined struct in a function. And the struct ( theStruct ) is not declared in the same header file as the funct...

[6 replies] Last: r (by Owenno)

by Latik

expected primary-expression before ‘int’

This is what i have example code in c++: #include <iostream> class Foo{ public: void bar(){ std::cout << "Hello" << std::endl; ...

[6 replies] Last: Why did you make the num1 and num2 global variables? What is Foo_max(... (by keskiverto)

by xystus

Help with string inputs on if statements

I'm trying to figure out how to make an input with a string thats part of an if statement. how i think it should be done #include <iostream> #include <stri...

[7 replies] Last: yeah, this is saying if you already defined string. my string is undef... (by xystus)

by Beginner1452

Trouble With Resetting the Board on Tic- Tac -Toe

I cannot seem to figure out how to reset the board in order to play again without spots already taken. Please help me out and if you see any style problems i wi...

[1 reply] : I cannot seem to figure out how to reset the board in order to play a... (by dhayden)

by VirtuaSinner

SDL_DisplayFormatAlpha

So a couple weeks back I was on here looking for ways to accelerate my game's performance, and learned about SDL_DisplayFormatAlpha. The end results of applyin...

[8 replies] Last: I've had it running flawlessly today on a 5 year old, low end laptop ... (by helios)

by toyamin

my simple ATM source has error..

Account, AccountList, taskManager,ioHandler <-classes in code. my code: Class part class Account{ private: string accNum; string pin; int balance; str...

[1 reply] : You have declared the default constructor on line 9, but did you defin... (by dhayden)

by dashbob

fseek() and random access

I dont know what I'm doing wrong here, but when I try to use fwrite() to update a file, the data doesn't change #include <stdio.h> #define SIZE 20 typ...

[2 replies] Last: Many thanks yay! (by dashbob)

by henrymorgan

please help for matrix diagonalization in c++

ı have to prepare a project. but ı don t know how can ı do this. program will find a matrix P for a square matrix A such that P^-1 A P

[15 replies] Last: I'm stuck :) Does anyone have any ideas? (by henrymorgan)

by Fractal Cat

Math problem

Hi, my problem is this: double st; st = 100 * sin(360 * (10000/23)); Now when my calculator is working in radians st is evaluated to 97% which i...

[2 replies] Last: Here's the example from the tutorial. http://www.cplusplus.com/refere... (by wildblue)

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