I would like to track user actions within my windows desktop application, and write them to a database.
I also have a User class, that has a userID field pulled from the User table. I can write a login event (UserID, timestamp, action) with no problem, but as the user navigates around the app, how can I persist the user object so I always have access to their userID? I know I can just pass it as a parameter as they do different tasks, but that seems inefficient to me.
Issue 1: I am using a stringstream object in a block of my program that needs to be visited repeatedly depending on a user's selection from a menu. I want the contents of this stringstream object to be cleared any time control gets to this part of the program. I have tried the clear and flush functions to no avail.
Issue 2: I am reading data from a source text file that would be regularly changed during the course of program run. After the program run is over, I am supposed to save the results(which is basically the source text file AND all updates) in a destination file. This destination file would then serve as the source file when next the program is run. In other words, I want a scenario where my results overwrite the original contents of the source file; implying that my source and destination files are now one, pretty much. How can I do this?
I'm unable to access private variables belonging to the object class Date, which my overloaded >> operator is a friend of. I can't see anything in my code that would be causing this error. The .h file and the definition of the problematic overloaded operator from the implementation file are below:
#ifndef DATE_H #define DATE_H #include <string> using namespace std; class Date { public: // Initializes a date to the default value of January 1, 1970.
[Code] .....
The error message states that the vars (month, day, year) are declared as private in the header file and then a reference is made to the lines where I attempt to access these in the .cpp file and it reads: "in this context".
I'm trying to make a menu object in SFML. So far all I've added is the ability to add buttons with text inside of them. I store the buttons in a vector and then loop through that vector to draw the buttons.
The error stems from line 24 of the 2nd piece of code.
Here's what I've got:
//MenuTest.h #include <SFML/Graphics.hpp> #include <string> #include <vector> class Menu1 { class Button1 { sf::RectangleShape body;
[Code] ....
This causes an error at the line window.draw(text); in Menu::Button::drawButton(). With the error "Access violation reading location (some memory address)".
Everything up to trying to draw the text works fine.
What I want is just to make a validation of the users and passwords already set within my array and go to the other form. By the way this form I already made it my start up form on program.cs with the same command I am trying to back to MainForm.
I am a beginner with C++, taking a class right now. The lab this week is to create a user defined class and have it accesses in a separate .h header file from the main.
I think I'm finding my way through it, but I'm getting a complie error that makes no sense to me:
Here STRING is a user defined class. how to assign a constant char array "FOOBAR" to string object? Copy constructor need to be same class type as parameter. and overloading assignment operator also need to be same class type. I think 'friend' can let pass another type of object rather than STRING to do operation on overloaded '=' operator. How could it be done if it is possible at all?
Compiles with 0 error but on running 2 Errors appear.
I'm Inputting data of an object from user and then inserting it in the link list.
#include <iostream> //#include <fstream> using namespace std; #define LEN 100 //////////////////////////////////////////////////////////////////////////////////////////////////// class employee{
I am getting a compilation error from the code below. It is when i am naming a variable with my user defined type.
#include<iostream> #include<cstring> #include<cstdlib> using namespace std; class person {
[Code] .....
C:Dev-CppTRIAL.PASS.!!!.cpp In function `int main()': 66 C:Dev-CppTRIAL.PASS.!!!.cpp expected primary-expression before "p" 66 C:Dev-CppTRIAL.PASS.!!!.cpp expected `;' before "p" 74 C:Dev-CppTRIAL.PASS.!!!.cpp `p' undeclared (first use this function) (Each undeclared identifier is reported only once for each function it appears in.) 83 C:Dev-CppTRIAL.PASS.!!!.cpp `X' undeclared (first use this function)
I am currently trying to read information from an ID3V1.1 tag in C. For this project we are not allowed to use any external libraries. All of the fields except for the track field read correctly. The last two lines are the ones giving me trouble. Whenever I run the program, I get a seg fault when it tries to get the track number. I tried to debug using gdb and it said the problem was happening on line 34 which is where the fseek is. It works for the other fields so I'm wondering why it is going wrong. Should I change the offset to something other than -128? But the whole tag is only 128 characters so I'm unsure what is going wrong.
Code:
Program received signal SIGSEGV, Segmentation fault.0x00000034ff66edf1 in fseek() from / lib64 / libc.so .6 Missing separate debuginfos, use:debuginfo - install glibc - 2.12 - 1.132.el6_5 .3.x86_64(gdb) back #0 0x00000034ff66edf1 in fseek () from /lib64/libc.so.6 #1 0x000000000040076f in main (argc=1, argv=0x7fffffffdf58) at id3tagEd.c:34 Code: Code: #include<stdio.h> #include<string.h> }
i am trying to make a hangman game. The game works fine so far but i cannot seem to keep track of the letters used. I have to prevent the user from using a letter that has already been entered by the user at some point in the game before. But can't seem to work my way around it. I have included the code below
How do i read a specific part of a file? I am trying to create a game that reads the prices of an object inputted by the user from a file. This is the code i have so far
#include <iostream> #include <fstream> using namespace std; int main () { ifstream infile; infile.open ("Objects.txt", ifstream::in);
[Code] ....
The file contains this :
Example objects ( ) store items (item) (purchase value)/(sell value)
Grocery Store Items Fish 5 7 Vegetables 10 15 Drinks 20 30
does a pointer keep track of time stamps when it is created? i am trying to use it to create a table that can store the access count and the temporal locality at the same time.
I have a set of n- dimension point store in `vector< vector<double> >`
ex A[0][1].............[N], and A[0][0] = X, A[0][1] = Y, A[0][2] = Z
and I want to sort the vector of all of the dimension
ex sort X, Y, Z ,.........N in ascending order
ex A[0] = (1,5,3), A[1] = (3,2,1) A[2] = (2,8,4) after sorting index: 0 1 2 A[0] = (1,5,3), A[1] = (2,8,4) A[2] = (3,2,1) original index : 0 2 1
I find that `sort(vector.begin(), vector.end())` can sort it but how can I record the original index with a additional vector?
Is there a algorithm or C++ feature can solve it?
I have tried to solve it with a class wrapper it but I don't know how to write the compare function.
class point{ public: point(int totalLength = 0, int elementLength = 0); vector<vector<double> > pointSet;//store the n-D points vector<double> pointIndex;//store the index }; point::point(int totalLength, int elementLength){ pointSet.resize(totalLength,vector<double>(elementLength, 0)); pointIndex.resize(elementLength); }
I am trying to write a program that keeps track of social security numbers of customers I have to assume that its a four-digit number. When the program runs,it has to prompt that the user should enter a 4-digit number to record, or 0 to exit.
The program also needs to be able to give an error message if a certain number is entered more than once.
After all the numbers have been saved and you finally end it by pressing 0, it needs to be able to output all the entered SSN's.
Here is my code so far:
#include <iostream> #include <iomanip> #include <cmath> using namespace std; bool isExist(int ssn, int records[], int numberOfRecords);
In this assignment, you are going to write a program that keeps track of the social security numbers (SSN) of customers of a bank. Please notice that we are going to assume that SSN is a four-digit number (e.g., 1234. 0123 is not allowed.). When the program runs, it prompts that the user should enter a 4-digit SSN number to record, or 0 (zero) to exit.
So far I have this:
#include <iostream> using namespace std; bool isExist(int ssn, int records[], int numberOfRecords); int main(){ int ssn = 0; int records[32];
I wrote a code that mimics a dice, my code so far will ask for the user to input a number at which they want to hold or no longer throw the dice, it will also ask the user how many roll simulations they would like to do.
If a 1 is rolled the turn is over and the score is 0
After this input is recieved the code goes into a loop until the values have been met.
I would to add probability to my code so I need to know how many times a certain number was rolled and this is where I am stuck.
An example of how I would like my code to work, let's suppose hold at number is 17
We role the dice until we roll a 17 or larger, but if we roll a 1, then our score is 0.
Let's suppose the number of simulations is 5 and for simulation 1 we roll
2 + 5 + 6 + 4 = 17
and for simulation 2 we roll
5 + 4 + 1, but since we rolled a 1, the score is 0,
for simulation 3 we roll
3 + 4 + 5 + 6 = 18
for simulation 4 we roll
4 + 4 + 6 + 6 = 20
for simulation 5 we roll
3 + 4 + 5 + 5 = 17 so that means we got
0: 1 time 1/5 = .20 17: 2 times 2/5 = .40 18: 1 time 1/5 = .20 19: 0 times 0/5 = .00 20: 1 time 1/5 = .20 21: 0 times 0/5 = .00 22: 0 times 0/5 = .00
In other words the idea is to roll a 17 or larger (or whatever the hold number happens to be), but if you roll a 1, then your score is a 0.
#include <iostream> #include <cstdlib> #include <ctime> using std::cout; using std::cin; using std::endl; int dieRoll();
I am trying to write a program that keeps track of social security numbers (SSN) of customers of a bank. I have to assume that SSN is a four-digit number (e.g., 1234. 0123 is not allowed.). When the program runs,it has to prompt that the user should enter a 4-digit SSN number to record, or 0 (zero) to exit.
The program also needs to be able to give an error message if a certain number is entered more than once.
After all the numbers have been saved and you finally end it by pressing 0, it needs to be able to output all the entered SSN's.
Here is my code so far :
#include <iostream> #include <iomanip> #include <cmath> using namespace std; bool isExist(int ssn, int records[], int numberOfRecords); void listRecords(int records[], int numberOfRecords); int main()
I'm trying to keep track of the size of blocks of memory that a pointer points to. No matter what I do, this code below always outputs the integer 8.
If I change 1000 to 5, I still get 8. If I change it to 0, I get 8... If I change it to -1, I get 8. If I change int *a to double *a, I get 8. If I take away the & symbol, I get 8. If I use *& instead, I get 8.
Why? I want it to output 1000. If I change that to 500, I want it to output 500.
int *a; a = malloc(1000 * sizeof(int));
int j = sizeof(&a); printf("%d", j);
I want to build my skills where I can allocate, inspect and change memory sizes.
if we don't provide the acces modifiers for base class and we need to manipulate the private data of base class in derived class. Is there anyway to acces the private data members? Here's a coding example
class A { private : int a; }; class B : public class A { public : void displayA() { cout<<a<<endl; } };
how i can acces the a of base class A in derived class B without acces modifiers.
