Bytes - answers

game of 21, person vs. computer. first closest to 21 without going over wins help fin

mProgramz — Fri, 20 Nov 2009 18:06:52 GMT

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	//Specification: This program plays a version of

//the card game of 21.

//A human player is pitted against the computer.

//The player who is the closest to 21 without

//going over wins the hand. 

#include 

#include 

#include 
 
using namespace std;
 
//prototypes...

void play21(void);

int dealCards(int, string);

void hit(int &);

void determineWinner(int, int);

int Random(int, int);
 
void main(){
 
       char keepPlaying = 'n'; //loop control variable
 
       do {

              play21();
 
              //keep playing?

             cout << "Do you want to play anouther hand (y/n)?";

             cin >> keepPlaying;

     } while(keepPlaying == 'Y' || keepPlaying == 'y');

}
 
void play21(void){

        //play one hand of 21
 
        //randomize the cards

        srand((int) time(0));
 
       // deal the cards

         int person = dealCards(2, "Your Cards:");

         cout << " = " << person << endl;

         int house = dealCards(2, "Computers Cards:");

         cout << " = " << house << endl;
 
        // Ask if human wants a hit and keep hitting...

        hit(person);

        cout << endl;
 
       //Determine if computer takes a hit

       while ((house < person) && (house <= 21) && (person <= 21)) {

               house += dealCards(1, "The Computer takes a card ");

               cout << endl;

        }
 
       //show who won....

       determineWinner(person, house);

}
 
void determineWinner(int humanScore, int houseScore) {

//Compare the scores to see who won

//Both the human and the house score totals are provided as arguments

//Display total scores and indicate winner

//possible outcomes: human wins, computer wins, tie
 
}
 
int dealCards(int numberOfCards, string message){

//This function deals the cards

//The number of cards to be dealt is provided as an argument

//A message indicating which player is receiving the cards is also

//given as an argument

//The player message and the cards dealt is displayed to the screen

//the total value of the dealt cards  is returned
 
}
 
void hit(int &playerScore){

//This function asks the human if they want another card -- 'a hit'

//the player's score total is accumulated as they take cards

//the player can continue taking cards until they wish to stop or they exceed 21

//After a card is taken (use the dealCards function) the user's current total is displayed

//If the user goes over 21 'busted' is displayed
 
}
 
int Random(int lowerLimit, int upperLimit) {

//returns a random number within the given boundary

         return 1 + rand() % (upperLimit - lowerLimit + 1);

}

how to implement the CFileFind class in c++

bajajv — Fri, 20 Nov 2009 05:08:08 GMT

Hi,
I was trying to implement the functions of CFileFind class in c++. Can anyone give some hint how it can be done? Didn't find anything relevant on the net.

Thanks,

vc6 modify process priority

Macinbomzh — Fri, 20 Nov 2009 03:45:27 GMT

I've searched everywhere but couldn't find it.
Is there a way to set the priority level of a process given it's ID?

instance project

mar11 — Thu, 19 Nov 2009 18:04:38 GMT

Hi all,

i am having problem by instantiating an object of class in the same source file.
say, we have this code :

// file.h
#ifndef A
#define A

class A{

A();
~A();
// member functions
A_foo();
};
#endif;

// file.cpp
#include file.h

A Obj; // here is the cause of error

void A_foo(){

// something

}

when i execute the program i get segmentation error. If i increment the instance Obj . the program can be executed somehow!!

How can i declare this Obj of the same class file?

may someone help me with any suggestion?

vc6 get CPU, RAM

Macinbomzh — Thu, 19 Nov 2009 17:25:20 GMT

Hello, My program has to run differently in strong and weak computers.
Is there a way to get the CPU and RAM of the computer?

Can anyone help me to do these 2 questions ?Thanks a lot for your help~

micmicmic — Thu, 19 Nov 2009 16:14:07 GMT

Q1. find and replace a word in a text file .
Fristly, ask the user to input a file name and input the word which you want to find and replaced and then the result should be stored in a new file which need the user to input a new file name.

Q2.write a C program to do the spell checking in a file which is input by the user and then the correct spelling is in an another file, which is also input by the user. And print out which word is wrong spell in the given file .

Linker error for constructor and destructor of CList

bajajv — Thu, 19 Nov 2009 08:11:49 GMT

Hi,
While implementing CList class, I got linker errors for constructor and destructor. Below is the code -

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	template

class CList

{

protected:

    struct CNode

    {

        CNode* pNext;

        CNode* pPrev;

        TYPE data;

    };

public:

    POSITION AddHead(ARG_TYPE newElement);

    POSITION AddTail(ARG_TYPE newElement);

    POSITION GetHeadPosition() const;

                void RemoveAll();

               CNode* NewNode(CNode*, CNode*);

    ~CList();
 
                CNode* m_pNodeHead;

    CNode* m_pNodeTail;

    int    m_nCount;

    CNode* m_pNodeFree;

    struct CPlex* m_pBlocks;

    int m_nBlockSize;
 
    CNode* NewNode(CNode*, CNode*);

    void FreeNode(CNode*);

);

//For CPP file

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template

CNode* CList::NewNode(CNode* pPrev, CNode* pNext)

{

    if (m_pNodeFree == NULL)

    {

        // add another block

        CPlex* pNewBlock = CPlex::Create(m_pBlocks, m_nBlockSize,

                 sizeof(CNode));
 
        // chain them into free list

        CNode* pNode = (CNode*) pNewBlock->data();

        // free in reverse order to make it easier to debug

        pNode += m_nBlockSize - 1;

        for (INT_PTR i = m_nBlockSize-1; i >= 0; i--, pNode--)

        {

            pNode->pNext = m_pNodeFree;

            m_pNodeFree = pNode;

        }

    }
 
    CList::CNode* pNode = m_pNodeFree;

    m_pNodeFree = m_pNodeFree->pNext;

    pNode->pPrev = pPrev;

    pNode->pNext = pNext;

    m_nCount++;

    ::new( (void*)( &pNode->data ) ) TYPE;

    return pNode;

}
 
inline POSITION CList::GetHeadPosition() const

    { return (POSITION) m_pNodeHead; }
 
template

CList::CList(int nBlockSize)

{
 
    m_nCount = 0;

    m_pNodeHead = m_pNodeTail = m_pNodeFree = NULL;

    m_pBlocks = NULL;

    m_nBlockSize = nBlockSize;

}

template

POSITION CList::AddTail(ARG_TYPE newElement)

{

    CNode* pNewNode = NewNode(m_pNodeTail, NULL);

    pNewNode->data = newElement;

    if (m_pNodeTail != NULL)

        m_pNodeTail->pNext = pNewNode;

    else

        m_pNodeHead = pNewNode;

    m_pNodeTail = pNewNode;

    return (POSITION) pNewNode;

}

template

void CList::RemoveAll()

{

    // destroy elements

    CNode* pNode;

    for (pNode = m_pNodeHead; pNode != NULL; pNode = pNode->pNext)

        pNode->data.~TYPE();
 
    m_nCount = 0;

    m_pNodeHead = m_pNodeTail = m_pNodeFree = NULL;

    m_pBlocks->FreeDataChain();

    m_pBlocks = NULL;

}

template

CList::~CList()

{

    RemoveAll();

    m_nCount = 0;

}

I am getting the following linker errors -
error LNK2019: unresolved external symbol "public: __thiscall CList::~CList(void)" (??1?$CList@HH@@QAE@XZ) referenced in function _main

error LNK2019: unresolved external symbol "public: __thiscall CList::CList(int)" (??0?$CList@HH@@QAE@H@Z) referenced in function _main

No idea why this is happening. The constructor and destructor, both are public.

In main, I am using it like this-

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class CPerson

{

public:

    int age;

    CString sFullName;

    CPerson () {int age=10;}

    ~CPerson();

};
 
int main()

{

CList m_listPerson;
 
Person* lpPerson = new CPerson;

lpPerson->sFullName = "Rocky Billbao";

m_listPerson.AddTail(lpPerson);
 
lpPerson = new CPerson;

lpPerson->sFullName        = "Elvis Presley";

 m_listPerson.AddTail(lpPerson);
 
return 0;

}

can we replace __int64 with something OS independent?

bajajv — Thu, 19 Nov 2009 03:41:11 GMT

Hi,
Is there any replacement for __int64 type with something which is OS independent? Do I need to include any file, or can do it with some typedef?

Thanks

How do I make my keyboard work?

juanitagordon — Wed, 18 Nov 2009 19:09:21 GMT

I get a C++ runtime error in library and I can only enter my password upon startup. After that my keyboard is non responsive.

how can i set jump from a function to the main function??

nirmaltech28 — Wed, 18 Nov 2009 15:14:02 GMT

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	void main()

{

________            //statements....

________

step:

________

________

________           //statements......

}

int fun()

{

goto step;         //Have to jump to the label step in main function.

}                      //IS IT POSSIBLE, IF NOT TELL ME HOW CAN I DO IT.

Templated friends syntax

Banfa — Wed, 18 Nov 2009 14:51:05 GMT

So I have a little problem, I have a template class and that class contains a template function; now what I want to do is declare that function in the class (or indeed the entire class) as a friend of all specialisations of the class.

I did that (or thought I did) but the code I produced compiles with gcc 3.4.2 but not with Microsoft Visual Studio 2008 (Express Edition). So I have reduced my code to a minimum compilable example that exhibits the behaviour as follows

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	template

class Example

{

template template friend void Example::copy(RHS& rhs);
 
public:

    // Default constructor

    Example() : data(0) { }
 
    //Destructor deletes managed object when reference count is zero

    ~Example(){ delete data; }
 
    template

    R* asType() { return data; }
 
    template

    const R* asType() const { return data; }
 
    template

    void copy(RHS& rhs);
 
protected :

    T* data;

};
 
template

template

void Example::copy(RHS& rhs)

{

    this->~Example();
 
    data = rhs.template asType();

}
 
int main(int, char**)

{

    Example ei;
 
    Example el;
 
    ei.copy >(el);

}

One of the results of the production is that the code does appear to make logical sense, that is it appears more complex than required, however it does require that level of complexity in the full code. So for gcc 3.4.2 using the command line g++ -Wall -pendantic TemplateText.cpp compiles into an executable without producing any compiler diagnostic messages. However for Microsoft cl version 15.00.30729.01 (as shipped with Visual Studio 2008 Express Edition) the following errors are produced Expand|Select|Wrap|Line Numbers TemplateTest.cpp(4) : warning C4346: 'Example::copy' : dependent name is not a type prefix with 'typename' to indicate a type TemplateTest.cpp(25) : see reference to class template instantiation 'Example' being compiled TemplateTest.cpp(4) : error C2998: 'Unique-Type-copy copy' : cannot be a template definition TemplateTest.cpp(8) : error C3861: 'data': identifier not found TemplateTest.cpp(8) : error C2461: 'Example' : constructor syntax missing formal parameters TemplateTest.cpp(8) : error C2473: '{ctor}' : looks like a function definition, but there is no parameter list. TemplateTest.cpp(11) : error C2143: syntax error : missing ';' before '~' TemplateTest.cpp(34) : error C2039: 'copy' : is not a member of 'Example' TemplateTest.cpp(4) : warning C4346: 'Example::copy' : dependent name is not a type prefix with 'typename' to indicate a type TemplateTest.cpp(39) : see reference to class template instantiation 'Example' being compiled with [ T=int ] TemplateTest.cpp(4) : error C2998: 'Unique-Type-copy copy' : cannot be a template definition TemplateTest.cpp(8) : error C3861: 'data': identifier not found TemplateTest.cpp(8) : error C2461: 'Example' : constructor syntax missing formal parameters with [ T=int ] TemplateTest.cpp(8) : error C2473: '{ctor}' : looks like a function definition, but there is no parameter list. TemplateTest.cpp(11) : error C2143: syntax error : missing ';' before '~' TemplateTest.cpp(43) : error C2039: 'copy' : is not a member of 'Example' with [ T=int ] So can anyone here verify that the code on line 4 is in fact standard conforming syntax or show that it isn't? Alternatively can anyone think of a way of solving the problem described in the first paragraph?

How do I get percentage output from a csh script? ChetBritt — Wed, 18 Nov 2009 14:40:36 GMT I am writing a csh script and trying to get percentage output figures. When I divide two figures all I get is a zero value instead of the percentage number I'm looking for. Thanks. help regarding in c,c++ madhu24 — Wed, 18 Nov 2009 11:56:50 GMT hi guys, i am new to c.c++,can anyone send me any site which offer many simple c,c++ program to work out. nuber of occurence of each caractere using tree loops momotaro — Tue, 17 Nov 2009 19:50:26 GMT what is wrong with this code?? Expand|Select|Wrap|Line Numbers for(i = 0; i < taille; i++) { count = 0; for(j = 0; j < i; j++) { if(*(T+j) == *(T+i)) { i++; break; } else if(j == i) { for(k = i; k < taille; k++) if(*(T+k) == *(T+i)) count++; } } printf("%c : %d\n", *(T+i), count); } What is the use of class CTypedPtrArray? bajajv — Tue, 17 Nov 2009 14:00:26 GMT Hi, In CTypedPtrArray description in msdn, it is said that it can hold objects of CObArray or CPtrArray. But I am not able to figure out how they have implemented it. I mean how can they restrict which class we will be using as the base class. Why cant I give my own class if I implemented the functions of CTypedPtrArray in my code?