We've been tasked write a code which would mimic a secure entry keypad.. Only recognising the digits 0-9 for the passcode, and non-numerics S (start again) C (clear last digit) and E (enter) for the control. All other key strokes are to be ignored.
The passcode has to be <10 digits and represented on the screen by "****", with any keystrokes >10 ignored.
The valid passcode being 4 digits (1234).
With 3 attempts to get the correct pass code, after each fail attempt as please try again message show, where after the 3rd attempt a specific message is displayed and an alarm sounds..
I will sketch the scenario I would like to get working below. I have one main application.
That application, based on user interactions, can load other applications in a secure shell. This means these child applications cannot interact with the OS anymore, nor with each other.
The parent program can at any time call functions of these child programs.
The child program can at any time call functions of these parent programs.
How to implement this in C++? Preferably both parent and child should be written in C++.
The performance of loading the child applications doesn't matter. The only thing that matters is the performance of the communication between child and parent.
I'm attempting to make a cache simulator in C++. But I need to access individual bits in an integer to figure out where in my "cache" the writing actually gets done. I'm pretty new to bit shifting. Say I'm trying to access the the bits of the int 5, which are its "address". I'm simulating a direct mapped cache. I need to find its tag, the set it goes into, and which line. How do I use bit shifting to access the bits to acquire the tag, the index bits, offset bits, block number...all these pieces in order to actually find where I store it in the cache.
I've been working on creating a simulator to crash two galaxies together as part of a project to stress test a CUDA super computer. I've got a long way to go and am currently just working on correctly simulating n-body gravity functions. First I will use this to simulate the cores of the galaxies (the black holes) and eventually the stars.
So long story short I'm working on the beginnings of a gravity simulator. At this point I found some basic code that works well but doesn't quite give the effect I'm looking for.
The code below only pulls each object towards each other like a spring faster and faster until they shoot off into infinity. I try to give one of my bodies an initial velocity to get it to orbit another, but it always just shoots straight at the other body. I'm thinking I need to factor in inertia so that the initial velocity doesn't just get calculated away really fast by the other calculations.
I'm really looking for a bit of direction to get a real gravity simulator with orbits and such working right so eventually I can scale it up to a galaxy, throw in 100B stars and let the CUDA run for a month..
As you can see, I'm calculating all the bodies in a vector called "galaxies" with each other, and doing a basic gravity calculation to it. The update_position function simply takes the calculated acceleration and uses it to calculate the velocity and position based on the "elapsedTime".
I think I need to use the Varlet or Runge-Kutta integration methods, after doing a bit more research.
I'm attempting to make a cache simulator in C++. But I need to access individual bits in an integer to figure out where in my "cache" the writing actually gets done. I'm pretty new to bit shifting. Say I'm trying to access the the bits of the int 5, which are its "address". I'm simulating a direct mapped cache. I need to find its tag, the set it goes into, and which line. How do I use bit shifting to access the bits to aquire the tag, the index bits, offset bits, block number...all these pieces in order to actually find where I store it in the cache. I need to break the bits up into 3 sections: tag, set index, and block index. I think I can figure out the set and block index sizes based on the values passed in. The tag bits are just the remaining ones. And I'm hard coding values such as cache size (C) - 1024, number of physical address bits (m) - 32, block size (B) - 2, number of lines per set (E) - 1 (again, directly mapped cache). How would this look? I'll be using unsigned longs, so it can handle up to 64 bits.
I made this dice simulator which basically throws the dice 1 million times and outputs the frequency and percentage average for each side (1 to 6).
Everything is working fine, except my averages (floats) seem to be rounding up, causing 4% being "unassigned" at the end of the million rolls. I'm outputting with a setprecision of 2, but I only get 0's and no fractional numbers.
I finished my Enigma cipher simulator...how should I write the error handling code? Should I throw an exception in main, or in the Enigma ctor and Encrypt() fn when the user enters a non-alphanumeric character?
For a big project for school I have to make an airline reservation simulator but I have run into a problem. I want to save the the flight code and its location in a binary file so that I can obtain a code according to the location but this happens:
[URL] ... (link to current output and expected output)
I've been working on a battle simulator, and using it as a learning experience. So far, I've been able to debug the program, and learn some stuff, and it's been running smoothly. It's still runnable, but I've been trying to make it so the player can save his character, and continue the game later. However, I'm not sure whether it's the save or load function that's not working, because even if i save to a txt file, it's just a bunch of random characters. I don't know if that means it's not saving correctly, or if it's just supposed to be like that. Anyway, here are the two functions I'm speaking of:
i want to draw a highway, this simulator must not be graphical (must draw by "|" and "-" and...) . this highway include 3 type of car,
1- heavy 2-light heavy 3-light, t
These cars move from start point to quit at end of highway, highway must be object (programmed by class), and have 200 columns and 4 raw, it must be horizontal... . the cars speed are different,
I have the following code in sourceFile.cpp. functionA() is first called and inserted entires for key1, key2 and key3. Then functionB() gets called to use the vectors for the 3 keys. I want to free all memory after exiting functionC(). Among the three ways to put an entry into the map for the 3 keys, which is correct / better?
Class ClassA { ... } ClassA *key1 = new ClassA(); ClassA *key2 = new ClassA(); ClassA *key3 = new ClassA();
I have an assignment to create a program that will display the duplicate numbers that were entered by a user. I have the code finished and I have covered the basic requirements of the assignment. However, during my testing I found that if I enter anything other than a whole number (i.e. char or float) the program will run out and exit. I would like to add a little code to verify that the user has entered a whole number. I cannot seem to get this to work though. I have written other codes that verify if a number is above and below a certain value, I just do not know how to look for a certain type of entry.Here is my code:
int main() { int number[20]; int duplicateNumber[20]; int i, j, k, counter = 0; // Get number input from the user for (i = 0; i < 20; i++) { printf("Please enter a whole number %d: ", (i + 1));
Still working on my first homegrown C program design . The function basically allows the user to enter a list of classes and grades and saves the list to a file to be used later in the file. The function compiles and runs through without error except for the fact that it always prints the last user entry to the *profilep file twice. Just as a note, the scanchar function is one I made to scan in one character and an end of line character to throw away the end of line char before I learned about %*c about 30 minutes ago...
Also I haven't much bothered to strengthen the function against crazy user input but I have heard using fgets and sscanf in conjunction can replace scanf and protect against weird user input. How to apply this within the program.
Code: // creates a new profile and prints it to the profile file. void newprof(FILE* profilep, const char *allclasses[ABBR_SIZE]){ int c, checker, counter; int i, a; char prof[MAX_PROF][ABBR_SIZE]; char grades[MAX_PROF][3];
Using VC++ 2010 Express. I am creating a dll to export a simple Multiply function so I can use it in Excel/VBA
These e are the steps I am following :
. Create a Win32 C++ Project and give a name. For example: CallDllFromVBA . Select the DLL option in the Wizard and click Finish . In the CPP file (here CallDllFromVBA.cpp), add the following code
#include "stdafx.h" int _stdcall Multiply(int x, int y) { return x * y;
[Code] ....
The Build output show everything is ok as follows :
CallDllFromVBA.cpp CallDllFromVBA.vcxproj -> c:documents and settingsadministrateurmes documentsvisual studio 2010ProjectsCallDllFromVBADebugCallDllFromVBA.dll ========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
In VBA, I insert a module and add the following code:
Declare Function Multiply Lib _ "c:documents and settingsadministrateurmes documentsvisual studio 2010ProjectsCallDllFromVBADebugCallDllFromVBA.dll" _ (ByVal x As Long, ByVal y As Long) As Long Sub test() MsgBox Multiply(2, 4) End Sub
When I run the Test sub I get the error: 453 - Can't find dll entry point
I also opened the CallDllFromVBA dll with Dependency walker and I can't find the Multiply export function - In fact, the dependency walker doesn't show any function exports at all for the CallDllFromVBA dll !
I'm playing with my final year project, building a game boy emulator in C, and I wanted to try out something to streamline my code base. I'm building against Win32, GNU C and Googles Native Client.There are no platform specific headers or functions in use. What I'm trying to do is have a file that conditionally includes the entry point (so _tmain for Windows etc) based on a preprocessor directive being set/not-set.
[note] I realise I could write both entry point classes in one file and use the preprocessor directive in there, but it's not as neat as a single file calling in one or the other. I figure this should work because I can conditionally include headers for Win/NaCl (providing the signatures match, of course).
I'm having an issue during the linking stage of the .exe during compile time, and it's because of a call to a function with a polymorphic parameter.
//here's how the classes are setup class grandpa {}; class mom public grandpa{}; class dad public grandpa {};
[Code]....
dad has sons in the vector and mom has daughter in the vector. What I want to do is have a function that can accept either of these vectors as one parameter like so: void func(const grandpa* aObject);
Finally, I have an error when I pass an object to the function like so: func( d[0] );
I'm learning C# and having fun and I've been practicing by working on this little data entry console application. Basically the user inputs first name, last name, age, gender, employee id, then I ask the user if he/she wants to add another entry, if yes then loops back at the top, and if no, it prints out the amount of entries added. The issue I'm having is that the entry list is never kept or stored when adding another entry, it replaces what was entered before which is not what I'm looking for. I don't know how to stuff one entry list information seperately in an array so that I can print out which ever entry the user decides to choose once he/she is done adding entries. Is there a way to make this work?
Here is my program code:
using System; namespace Ch02_Exercises_12 { class Program { static void Main() { string firstName; string lastName; string input; sbyte age; char gender;
I created program that insert employes data and then print their data but never accept duplicate age if user entered duplicated age prompt him to enter another age (age must be unique)
Here is my code
#include<conio.h> #include<stdio.h> #define size 3 struct emp { int age,overtime,dedcution,netsal;
