General C++ Programming - C++ Forum - October 2011 (Page 7)

I am currently enrolled in a C++ class online, and I am a little behind as it has been a few months since my last class. The instructor is wanting us to build a...

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by ajaustin12

Taking an Input from a C++ Gui into another C++ program

I am currently developing a C++ program that does all the mathematical calculations, prints items to the screen that is scanned in by an RFID Reader, and allows...

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by mambopython

Trouble with char to string errors!!!

Hi there, I'm kind of a noob and have a software engineering assignment... Heres the question. 10 marks) Chapter 4, Programming 8, p. 168. Write a C++ progr...

[1 reply] : Assuming you're having problems with bracketstack.push(str.at(i)); ??... (by andywestken)

by Sam2020pc

Although I have included header file multiple times without using include guards, the code compiles without no error

I have a question about include guards. I assume that if you include your header file in multiple source files you should get compilation error, so to prevent t...

[5 replies] Last: No problem! :P (by friedEggHead)

by bruice

header files were included in the program, but cannot use them for errors

J just complied my program which include the header file BFSCfourier.h and pack_c.h.the BFSCfourier.h include the <fftw3.h> and the pack_c.h define these functi...

[1 reply] : These are linking errors, you need to link the library of pack_c.h wit... (by EricDu)

by KaraPardue

Finding Last Name and FirstName in Alphabetical order??

My teacher wants us to make a program that goes through two lists of students, if you enter a 10 it should go through one list, and if you enter a 14 it should...

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by RonTheMoron

Problems with segfaults.

I'm trying to code up a homework assignment (http://web.mst.edu/~price/cs53/fs11/h7.htm); When I run the output file, sometimes it segfaults and sometimes it do...

[2 replies] Last: If you use a debugger, it will identify for you the line that segFault... (by Moschops)

by Matthew Matic

Swapping elements of arrays

I have a 3 dimensional array, of the form bool bit[L*L] where L is the size of the thing I'm simulating. At times I need to swap all the elements in a 2...

[2 replies] Last: I agree with bartoli -- but be aware that it increases your bookkeep... (by Duthomhas)

by coolcoder

vectors

my question is regarding the max size of a vector (not the capacity of a vector!). the myvector.max_size() gives 1073741823 on my pc. suppose i have 2 vec...

[2 replies] Last: thanks...cleared my doubt (by coolcoder)

by viclubsmau4eva

So I am trying to display numbers in different formats

Here is some things I need for the program to do and this is in C by the way first line: integer, right justified in a 10 character field hex representation...

[3 replies] Last: Er, so far you have only posted problems getting numbers, and you ha... (by Duthomhas)

by amika

convert hex string to uchar[n]

Suppose that I have a number in hexadecimal notation with size 2n , like "aa00F234AA" . I want to write it in an unsigned char array of size n ( "aa" in th...

[1 reply] : int chhex(char ch) { if(isdigit(ch)) return ch - '0'; ... (by Syuf)

by rboyd486

Loop problems

Unhandled exception at 0x779015ee in hw7.exe: 0xC0000005: Access violation reading location 0x33612bd4. I am unsure of what this error means. Could someone h...

[1 reply] : (fall = false) You must write == for comparisons. = is for asign... (by bartoli)

by sunny grover

whats the value of z?

int z=1; CT::CT() { z=2; } CT::~CT() { z=3; } void main() { z=4; CT*C=new CT; delete C; }

[1 reply] : Where? Is it really hard to follow, though? You know that new calls th... (by hamsterman)

by hopesfall

How to write to specified file directory?

How would I prompt a user to enter a directory and then write to it? I've used ofstream to open a disk file and wrote it that way, but that doesn't let me speci...

[1 reply] : std::ofstream file1("/unix/absolute/path/to/file"); //Also valid on ... (by helios)

by mohsaied

std::bad_alloc for 2D arrays

Hi all, I have a large 2D array in a loop, in each iteration of the loop i want to expand that array so I do the following: 1- copy the array onto a new t...

[8 replies] Last: I reimplemented that whole part using a single vector which just store... (by mohsaied)

by Andy334

How to turn it into a function

double radius; string input = ""; for(;;) { cout << "Enter the radius of a circle: "; getline(cin, input); if(!(atoi(input.c_str())...

[1 reply] : instead of getline(cin, input) to input a string number and then conve... (by buffbill)

by surge0929

8 Queens problem.

ive been having a few problems writing this program, the problem is to place 8 queens on a chessboard in such a way that no queen can take any other queen. i...

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by closed account 236Rko23

how to smooth arbitrary values without using an average

hi there, i'm doing a fan controler for my pc, and i'm having some problems smoothing the fans' acceleration. this is what i've so far, for the linear accelera...

[2 replies] Last: i was experimenting with other methods too, but in the end, yours was ... (by closed account 236Rko23)

by kjs5533

Recursive function problem

Im trying to create a program that will employ a recursive that will estimate the square root of a number using the approximation NextGuess = 0.5(LastGuess -...

[1 reply] : I think that your initial formula is wrong: instead of nextguess = .5(... (by tfityo)

by sasadorian

multidimensional array in a struct leading to core dumps

struct s { string s1; string s2; vector<float> v1; vector<float> v2; vector<float> v3; float arr1 ; float arr2 ; // PROBLEM...

[3 replies] Last: Try breaking up the array. Instead of allocating a huge 4-dimensional ... (by helios)

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General C++ Programming - October 2011 (Page 7)