C++ :: Create Data And Saves It Into Block - fstream Appearing To Not Function Properly
Apr 14, 2013
I'm working on a program which creates data and saves it into blocks (different files), then reloads and converts it all. the .ftl file saves properly, but for some unknown reason, it won't let me open it for input after.
setblock will typically = 3, but for testing purposes is set to 1. this really has me confused. the compiler i'm using is Dev-C++ 5.2.0.1 on xp. i have tried pausing the program after the output file is closed, confirming the file has been created in the proper directory before continuing but still fails the .is_open() check.
Ive used a similar approach to extract data from a txt file before, however now it seems to crash when i get to the load, below is the code with a NOTE next to where it crashes. This is homework so no code but just information on why it was working for one dataset but not his new one.
/* The purpose of this program is to read in data and sort with selection and insertion sort. It will read data from file and write to a new file the sorted data */ #include <iostream> #include <fstream> using namespace std; bool openFile(ifstream&);
For some unknown reason when i try the following code it doesn't create a file. (the program will simply get two inputs from the user and then use http to obtain the html/php text and then output it to a file)
code:
#include <SFML/Network.hpp> #include <iostream> using std::cout;
And the following program that displays block by block:
StreamReader streamReader = new StreamReader("G:LAB123LABWORK2.txt"); int block = 0; while (!streamReader.EndOfStream) { string line = streamReader.ReadLine().Trim(); if (line.CompareTo("") == 0)
[Code] .....
My problem is am supposed to add a verification code so that if i put a string e.g 1:?:? it returns the block where the string is found and gives of all possible answers.
Suppose, I have point_c, line_c and block_c three classes:
class point_c { public: double x, y; };
class line_c { public: vector<point_c> Pt;
[Code] ....
As you can see, lines are composed of many points, and blocks are composed of lines and points. And I defined some member functions, so that I can add points or lines as required by line and block.
But, here comes the problem, if I use line.insertPoints(), or block.insertPoints(), the points will be stored in line or block. That is not what I want.
I want have a single place to store all points, a single place to store all lines, and a single place to store all blocks.
class point_c { public: double x, y; }; class line_c { public: vector<size_t> PtIndex;
[Code] .....
in this way, the member functions will create the real entities into the global vector and set an index pointing to that entity. But this approach just make me feel it is not OOP anymore. when people using these classes, they got be careful about the global variables.
I start working on CodeBlocks and stuck in a situation. The situation is that I want to clear my output screen every time the main function calls some other functions. To do that I use clrscr() function but its not working. After spending some times on web, I found that its a non-standard function so this extension is not used by the new compiler's. Another thing I find to use < cstdlib > library. But unfortunately it do works only for C. It works for C++.
I have two std::string data items that contain binary data (so it may have the null character!). What is the proper way to concatenate them to preserve all of the data? I am guess a simple:
string string3 = string1 + string2;
Will not work, as it will terminate string3 on the first NULL character it encounters.
I need to create a main function with a one dimension dynamic array with float data type. The total number of array elements must be controlled by a user input from the keyboard. Test data is three different lengths 3,6,9 of the array. The lengths have to be set up at run time from users input. I understand how to create dynamic array but not where the user inputs the length of the array. How would I implement this?
I am trying to write a client/server application that takes input to an array of structures from the user,stores the data in a shared memory segment and then writes the same to a file when I close the application. How do I get started? And how do I ensure that the server stores the data correctly? Also, the server needs to be a concurrent server that accepts connections from multiple clients.
I am doing a program that saves information on the memory and then i need to put by ascending order the student number.. but i can't get it to work...i tried with strcmp but not worked...
Code: typedef struct { char name[100], email[100], adress[100], postal[100], number[20]; int phone }data; t
Then i have this to input data
Code: void add(data* contact) { if (i<total) { printf(" Name: ", i + 1); fflush(stdin);
i am facing some problem with qsort() function it work well if the last element of array is larger then the 2nd last element. But in case if last element of array is smaller then the 2nd last it will sort the whole array and remains the last as it is. For example
Code: int group_id_local[max_j]={2,1,4,5};// it work fine, output should be {1,2,4,5} but if i have this one
int group_id_local[max_j]={2,1,4,3}; // output should be {1,2,4,3} /* COMPARE FUNCTION FOR USING QSORT()*/ int cmpfunc (const void* a, const void* b) { if (*(int *)a < *(int *)b) return -1; if (*(int *)a > *(int *)b) return 1; return 0;
I'm working with a cross-platform library which defines a function to obtain function addresses from a shared object (i.e. a DLL on Windows). Here's my modified version of the function which works (albeit only on Windows of course):-
Code: typedef void (*SuilVoidFunc)(void); /** dlsym wrapper to return a function pointer */ static inline SuilVoidFunc suil_dlfunc(void* handle, const char* symbol) { return (SuilVoidFunc)GetProcAddress((HMODULE)handle, symbol); }
Now, here's the original (cross-platform) version which is giving me a run time error on Windows:-
That original version fails at the final return line. The error message says "The value of ESP was not properly saved across a function call".
I'm assuming there's a problem with the declaration of VoidFuncGetter (i.e. it'll assume that the caling convention for GetProcAddress() is cdecl when in fact, it's stdcall). What's the most elegant way to fix this and still keep cross-platform compatibility?
This function should delete each element in the list which is the same as this one typed by user. There are no errors, but function doesn't work. It deletes something, but not this element which should.
I am unable to implement the insert function properly, every time i run the program i just get the first value and name, I am not getting other Id's and name.
"(Header File)" #include <iostream> #include <string> using namespace std; class node{ public: int ID; string name; class node *left, *right, *parent;
I tested my count funtion. So my count function is not working properly, it should return 5 because 5 words have prefix "tal," but it is giving me 10. It's counting blank nodes.
This is my main.cpp file
int main() { string word; cout<<"Enter a word"<<endl; cin >> word; string filename;
I have a struct called Array and I'm to create a function to create a dynamic array that's fill with randomly generated integers from 0 to 50 (inclusive) and a function to destroy the array for freeing its memory. Below the code that I have written so far.
Code:
* Struct */ typedef struct {int *pArray; //the dynamic array int length; //the size of the dynamic array}Array; /* Function to create a dynamic array */ Array *initializeArray (int length) {int i; }
I have an issue with my codes as according to what I created the fitness level have to appear right after I enter the time take to 3 miles. However it only appears once after repeating five times.
I am trying to inherit from class but the same error is appearing
Code: 1>c:userskthdu_000documentsvisual studio 2010projects ectangle ectangle1crectangle.h(1): error C2011: 'Crectangle' : 'class' type redefinition the following is my classes crectangle.h
