C :: Dynamically Create A New Memo Structure To Hold Memorized Fib
Jun 14, 2013
I need to dynamically create a new Memo structure to hold memorized fib #'s.I have two structures:
Code:
typedef struct HugeInteger
{
//array to hold the digits of a huge integer
int *digits;
//number of digits in the huge integer
int length;
}
[code]....
am having trouble with initializing the struct inside of the new Memo, I need the digit fields to null and the length field to 0 to indicate that F[i] has not yet been memoized...I have F->digits and F->length in the for loop but this just simply doesn't work..
So i'm actually using polyphormism for calculating the area of the cross and other shapes. so how do I actually make use of dynamically create an object this way?
do I create them in my Shape2DLink or in my individual child classes?
What i'm trying to create is a simple State Manager for SFML! I created another class that inherits State.
#pragma once #include "state.h" class FirstState : public State { public: FirstState(); ~FirstState(); void handle_action(); void update(); void render(); };
So the question is this, each state that i have will inherit the State class. However, i wanted to perhaps add each state object into a vector array. But i'm not sure as to what data type it be? I have a state manager class that will contain the vector.
What i want to do is this, each game state will create an object that will inherit functions from the state.h class. I want to store them all in a vector array, but each object is clearly named different. My curiosity was wondering, since all those different states inherit the State.h class, can i simply create a State Object std::vector<State> *states; that will contain all those different state objects?
This creates quite a mess. It seems that somehow the "vector" declaration isn't working as the referenced web link seems to suggest that it should. I presume that, as usual, clearing one real error will eliminate the cascade of errors the first real error produces. Why won't VC++ accept the "vector" identifier?
The error messages that follow the build attempt are:
Friedman.cpp d:documents and settingsxxmy documentsvisual studio 2010projectsfriedmanfriedmanEinstein.h(22): warning C4996: 'fopen': This function or variable may be unsafe. Consider using fopen_s instead. To disable deprecation, use _CRT_SECURE_NO_WARNINGS.
I am using Dev C++ compiler on Windows 7 and was programming a piece of code that is supposed to do the following -
Create a structure to store information about products for sale in a store. It should store information about the product name, the price, and the product number and then create an array of products called Inventory. Add five products to your inventory.
But for some reason, which is unknown to me, I always seem to get a compiler error. And this is what i have so far -
I'm using SDL to try to create a Run and Shoot game. But I do not know how to check if a key is down while the user is HOLDING it.
I do know how to check if a key was pressed.
I have tried with the "event.key.keysym.sym" and "Uint8 *keystate = GetKeyState(NULL)" both worked to check if a key was down but I thought that the GetKeyState(); Function would even check when a key where HELD down
I want my player to move while holding down left or right arrow. So I did something like:
Code:
Uint8 *keystate = GetKeyState(NULL); if (keystate[SDLK_RIGHT]) { apply_surface(x++, y, player, screen); }
I had a program (on console) that uses a third-part software to draw some graphs. In order to hold the graphs on the screen, I used cin.get(); and that worked.
Now I created a GUI with Qt. The code remains generally the same. The code continues to call the software to draw graphs (during drawing graphs, there is a console opened automatically). Butcin.get(); in the code cannot hold the graphs on screen anymore. The graphs appear and disappear immediately.
I have a task to hold a number like 4.0000000000000000199e+30 and, in a variable like long double (the largest of the data type) doesn't hold the whole number, holds only 4.099e+30, like that.
How would I use the list container to hold a class?
class A { private : int x; public : void setX(int val) { x = val; } };
class B { private : std::list<A> pdata; public : void addToList(); };
For adding, I thought of trying something like
void B::addToList() { A *tmp = new A; if(A != 0) { tmp->setX(5); pdata.insert(tmp); delete tmp; } }
How would I do what I'm trying to do? Or is this the wrong way to go about it? For the actual program, "B" would contain several lists of various classes.
I have an abstract class named Terrain, and a class named RoadMap, which supposed to hold an N*N array of Terrains. But I'm not sure what type should the RoadMap class hold:
Code: #ifndef TERRAIN_H #define TERRAIN_H class Terrain {
[Code] ....
I can't use an array of refernces here, so I tried this:
Code: Terrain** terrain; and then I thought this was the way to go:
Code: Terrain (*terrain)[]; But now I'm not sure.
The N*N matrix size supposed to be determined according to a given input... What type should I use there?
im doing a program to store name, age, time and fitness. and i need to hold a table of 5 such records.can i do this?
#include <iostream> using namespace std; int name1, age1, time1, fitness1; int name2, age2, time2, fitness2; int name3, age3, time3, fitness3; int name4, age4, time4, fitness4; int name5, age5, time5, fitness5;
For the past couple of weeks I have been working on a template to hold two-dimensional arrays. Right now I am puzzling over an indexing question.
There are many places in the template where I would like to use initializer_lists to refer to user-specified row and column ranges, particularly in member function arguments. A typical example would be a member function whose declaration would be along the lines of:
Code: Array<Type>::some_function(std::initializer_list<int> columns, std::initializer_list<int> rows); which could get called via
Code: arrayInstance.some_function({3:4}, {5:8});
It would be really nice to be able to use Matlab-style indexing to specify the last column, or the last row, in the Array object -- along the lines of
Code: arrayInstance.some_function({3:4}, {5:END}); where END takes the value -1, and can be defined in Array, or somewhere else.
The way I have tackled this so far was to write myself an Indices PODS class with two elements to hold start and finish values, and a constructor-from-initializer_list that looks something like this:
Code: Indices::Indices(std::initializer_list<int> range, int replace_value) { int const *it = range.begin();
So the elements of "range" give the values of Indices::start and Indices::finish -- but if either of them are entered as END by the user, they will be replaced by replace_value. (The default value of replace_value is END, so Indices::start and Indices::finish will never change if it is omitted.)
I also defined an Indices::endset(int) function to do the same thing for existing Indices objects:
Code: Indices::endset(int replace_value) { if (start == END) start = replace_value; if (finish == END) finish = replace_value; } Using Indices::endset, you can code up Array::some_function by modifying the above signature to something like
Code: Array<Type>::some_function(Indices columns, Indices rows) { columns.endset(this->M); rows.endset(this->N); ... }
This does work, and I've been able to use it in practice. However, it is klutzy. What I would really like to be able to do is have the Indices constructor handle value-replacements in "columns" and "rows", instead of needing to put calls to Indices::endset in every single Array<Type> member function that uses this approach.
The basic problem is that, when Array<Type>::some_function is called, there is no easy way of inserting Array<Type>::M and Array<Type>::N into the optional argument of the Indices constructor when "columns" and "rows" are being built.
The Indices class needs somehow to get access to these, and know which one is being used, M or N. So it needs to have some sort of deeper connection to Array<Type>, but I don't know what that connection should be.
Consider a new data type, the mikesint, which can hold 9 bits.
(a) What is the largest integer that an unsigned mikesint can hold? (b) What is the largest positive integer that a signed mikesint can hold? (c) What is the largest negative integer that a signed mikesint can hold?
Using SFML, I had a Board class which held multiple vectors of all of my object types in the game, and then it also held a vector of pointers to the memory addresses of these object instances, like this
class Board{ //... std::vector<AbstractObject*> GetAllLevelObjects(){ return allLevelObjects; } //so these are used to hold my object instances for each level
[Code]....
When looping through this vector and drawing the sprites of the objects, I get the runtime error 0xC0000005: Access violation reading location 0x00277000. I solved this error by storing the vector of pointers in the class that holds my Board instance, but I'm wondering why only this solution worked? Why couldn't I just have my vector of pointers in the same class that the instances of those objects were in?
