Managed C++/CLI

Re: operato precendance question

2-Oct-12 2:58

The rules are that expressions such as this may lead to incorrect results. You need to split it into constituent parts.

One of these days I'm going to think of a really clever signature.

jschell2-Oct-12 8:51

Re: operato precendance question

2-Oct-12 8:51

Amrit Agr wrote:
Please give some help for it.

Rewrite it so it is more maintainable.

skrtbhtngr15-Nov-12 0:39

skrtbhtngr

15-Nov-12 0:39

C++

void main()
{
int Var = 90;
if(Var += (((Var == (++Var)) == 89)))
printf(" %d ",Var);
}

Operator precedence:
1. Increment operator (++)
2. Relational operator (==), and its Associativity is Left to Right
3. Assignment operator (+=)

Hope it helps... Thumbs Up | :thumbsup:

Large integer class please help

Msemler9328-Sep-12 1:29

Msemler93

28-Sep-12 1:29

Hi my professor gave my class this homework to do without giving us any notes or hints on how to do it. Im so lost and dont know where to start. I've put together some of the member function declarations and one constructor but highly doubt if they're correct.

An array can be used to store large integers one digit at a time. For example, the integer 1234 could bestoredinthearrayabysettinga[0]to1,a[1]to2,a[2]to3,anda[3]to4. However,for this project, you might find it more useful to store the digits backward, that is, place the least significant digit 4 in a[0], 3 in a[1], 2 in a[2], and the most significant digit 1 in a[3].

Design, implement, and test a class in which each object is a large integer with each digit stored in a separate element of a character array. You’ll also need a private member variable to keep track of the sign of the integer (perhaps a Boolean variable), and another private member variable to keep the size (or length) of the integer. The number of digits may grow as the program runs, so the class must use a character pointer (dynamic character array) as a member variable, which stores its value on the dynamic memory freestore (heap). You should also implement other appropriate operators for this class. More specifically, your class should provide default constructor, deep-copy copy constructor, overloaded constructor(s), destructor, deep-copy assignment operator, overloaded arithmetic operators, comparison operators, input and output operators. You should also have a nice driver code to test all implemented member functions and overloaded operators.

#include <iostream>
using namespace std;
class BigInteger
{
private:
    bool sign; //sign of number
    char * arr; //dynamic character array
    int size; //size of array

public:
    BigInteger(int size=0); // default constructor
    BigInteger( const char* arr); // constructor that takes an int as a parameter
    BigInteger( BigInteger& arr); // copy constructor
    ~BigInteger(); // destructor
    void swap(BigInteger&);
    void count( int );
    BigInteger& operator=(const BigInteger& arr);
    BigInteger& operator+(const BigInteger& arr);
    BigInteger& operator-(const BigInteger& arr);

    bool operator==(const BigInteger & arr) const;
    bool operator!=(const BigInteger & arr) const;
    bool operator<(const BigInteger & arr) const;
    bool operator>(const BigInteger & arr) const;
    bool operator>=(const BigInteger & arr) const;
    bool operator<=(const BigInteger & arr) const;

    friend ostream& operator<<(ostream & output, const BigInteger& arr);
    friend istream& operator>>(istream & input, const BigInteger& arr);
};

int main()
{

}

BigInteger::BigInteger(int size) : arr(){

    arr= new char[size+1];
    for(int i=0;i<size;i++)
    {
        arr[i]=' ';
    }
    arr[ size ] = '\0';

}

BigInteger::BigInteger(const char* arr){


}

any help with this program to even get it started would be very appreciated thank you, i'm not asking for just the answer i actually want to know what i'm doing in my class.

Richard MacCutchan28-Sep-12 2:05

28-Sep-12 2:05

Msemler93 wrote:
i actually want to know what i'm doing in my class.

If you don't know then it's a sure bet that we don't.

If you have specific technical questions then people will try to answer them, but no one is going to do your assignment for you. If you really do not understand the assignment then go and talk to your professor, or find some books or online materials to help you.

One of these days I'm going to think of a really clever signature.

jschell28-Sep-12 10:22

28-Sep-12 10:22

You don't need the null at the end

Your constructor looks ok except that you did not take into account that the first byte might be a sign character.

I am not sure why your teacher thinks it would be better to store it backwards.

I suggest you try to create the following method next.

bool operator==(const BigInteger & arr) const;

To code it THINK (don't code) about the following cases
- The number is exactly the same.
- One number is zero, the other isn't.
- One number have more digits than the other.
- AFTER you do the above then consider what happens if the 'sign' value is set to represent a negative value.

AFTER you think about the above then attempt to code the method.

Msemler9329-Sep-12 9:52

Msemler93

29-Sep-12 9:52

ok me and my friend have been working on the program and are having trouble getting the arrays to pass to the functions and dont know where the issue is.

#include <iostream>
using namespace std;

class Integer{

public:
Integer();
Integer(Integer& a);
Integer operator +(const Integer &);
Integer operator -(const Integer &);
bool operator<(Integer)const;
void SetArr();
void print();
void addNumbers();
void subNumbers();

private:
bool sign;
int size;
int size2;
int size3;
char * arr1;
char * arr2;
char * arr3;

};

int main()
{
Integer sum,diff, in1,in2;
in1.SetArr();
/*in2.SetArr();

in1.addNumbers();
in1.print();
in1.subNumbers();
in1.print();*/

}
Integer::Integer()
{
size=0;
arr1=NULL;
}
Integer::Integer(Integer& a)
{
a.size=0;
a.arr1=NULL;
}
void Integer::SetArr()
{
cout<<"How many digits is the number?"<<endl;
cin="">>size;
int* arr1=new int[size];
cout<<"Enter the sequence of the "<<size<<" integers"<<endl;=""
="" for(int="" i="(size-1);i">=0;i--)
cin>>arr1[i];

cout<<endl;
for(int="" i="0;i<size;i++)
" cout<<arr1[i];

="" cout<<endl<<"how="" many="" digits="" is="" the="" second="" number?"<<endl;
="" cin="">>size2;
int* arr2=new int[size2];
cout<<"Enter the sequence of the "<<size2<<" integers"<<endl;=""
="" for(int="" i="(size2-1);i">=0;i--)
cin>>arr2[i];

cout<<endl;
for(int="" i="0;i<size2;i++)
" cout<<arr2[i];

="" if(size="">=size2)
size3=size+1;
else
size3=size2+1;

int* arr3=new int[size3];

int carry=0;
for(int i=0;i<size3;i++){
arr3[i]="48+(arr1[i]+arr2[i]-2*48+carry)%10;
" carry="(arr1[i]+arr2[i]-2*48+carry)/10;
" }

="" cout<<endl<<"addition:"<<endl;
="" for(int="" i="(size3-1);i">=0;i--)
cout<<arr3[i];

="" cout<<endl<<endl;

=""

="" for(int="" i="0;i<size3;i++){
" if(arr1[i]="">arr2[i])
arr3[i]=arr1[i]-arr2[i];
else{
arr1[i+1]=(arr1[i+1]-1);
arr1[i]=arr1[i]+10;
arr3[i]=arr1[i]-arr2[i];
}
}
cout<<endl;
for(int="" i="0;i<size3;i++)
" cout<<arr3[i];
="" cout<<endl<<"subtraction:"<<endl;
="">=0;i--)
cout<<arr3[i];

}
void integer::print()
{
="" for(int="" i="0;i<size;i++)
" cout<<arr1[i];
}

void="" integer::addnumbers()
{
="" int="" carry="0;
" arr3[i]="48+(arr1[i]+arr2[i]-2*48+carry)%10;
" }
}

void="" integer::subnumbers()
{
="" if(arr1[i]="">arr2[i])
arr3[i]=arr1[i]-arr2[i];
else{
arr1[i+1]=(arr1[i+1]-1);
arr1[i]=arr1[i]+10;
arr3[i]=arr1[i]-arr2[i];
}
}
}

jschell30-Sep-12 8:12

HOW CAN I CREATE A TRAPEZUM WITH A CIRCLE INSIDE IT??(CODE)

30-Sep-12 8:12

Use code tags when you post code.

Focus on the class - not the input/output. For testing you can hard code some values right now.

williamjr19-Sep-12 22:09

williamjr

19-Sep-12 22:09

HOW CAN I CREATE A TRAPEZIUM WITH A CIRCLE INSIDE IT??(CODE)

Re: HOW CAN I CREATE A TRAPEZUM WITH A CIRCLE INSIDE IT??(CODE)

Wes Aday20-Sep-12 3:57

Wes Aday

20-Sep-12 3:57

Why are you screaming at the people when you are asking for help?

You might look at using a graphics library to draw graphics objects....

Why is common sense not common?
Never argue with an idiot. They will drag you down to their level where they are an expert.
Sometimes it takes a lot of work to be lazy
Please stand in front of my pistol, smile and wait for the flash - JSOP 2012

Re: HOW CAN I CREATE A TRAPEZUM WITH A CIRCLE INSIDE IT??(CODE)

Pete O'Hanlon20-Sep-12 4:40

Pete O'Hanlon

20-Sep-12 4:40

We assumed it would be through code. If you're just talking about drawing it on paper, then you've come to the wrong place.

For the trapezium, draw a polygon. For the circle, draw an ellipse. Use maths to work out where to position each.

*pre-emptive celebratory nipple tassle jiggle* - Sean Ewington

"Mind bleach! Send me mind bleach!" - Nagy Vilmos

CodeStash - Online Snippet Management | My blog | MoXAML PowerToys | Mole 2010 - debugging made easier

Windows Shutdown notification in a MFC Dialog app

Sunil P V13-Sep-12 0:20

Sunil P V

13-Sep-12 0:20

Hi,

I need a notification mechanism for windows shutting down prefferably wthout polling.

Any ideas?
Thanks in advance.

Sunil

Re: Windows Shutdown notification in a MFC Dialog app

Richard MacCutchan13-Sep-12 0:27

Re: Windows Shutdown notification in a MFC Dialog app

13-Sep-12 0:27

WM_QUERYENDSESSION[^] may be the message you need to check.

One of these days I'm going to think of a really clever signature.

Rajesh R Subramanian20-Sep-12 3:36

Rajesh R Subramanian

20-Sep-12 3:36

Some dimwit had downvoted you for giving a valid answer.

"Real men drive manual transmission" - Rajesh.

Re: Windows Shutdown notification in a MFC Dialog app

Richard MacCutchan20-Sep-12 3:56

Re: Windows Shutdown notification in a MFC Dialog app

20-Sep-12 3:56

Rajesh R Subramanian wrote:
Some dimwit

Extremely dim, I think. Thanks, your 40 points take me soaring to the sky again. Laugh | :laugh:

One of these days I'm going to think of a really clever signature.

Wes Aday20-Sep-12 5:53

Wes Aday

20-Sep-12 5:53

And another counter.

Re: Windows Shutdown notification in a MFC Dialog app

Richard MacCutchan20-Sep-12 6:09

Re: Windows Shutdown notification in a MFC Dialog app

20-Sep-12 6:09

Thanks, maybe my stalker is back from holiday, or jail.

One of these days I'm going to think of a really clever signature.

Sunil P V20-Sep-12 4:58

Sunil P V

20-Sep-12 4:58

Sunil

Question about ternary operator in initializer list

elelont211-Sep-12 22:29

elelont2

11-Sep-12 22:29

Hi,
i have two classes, and i am trying to use the ternary operator in the initializer list to initialize Class2 memeber to some value or null based on the data in MyClass2 constructor:

MyClass
{
...
int x;
int y;
}

MyClass2
{
...
MyClass myObj;
}

MyClass2 Constructor:

Version 1)

C++

MyClass2(const AnotherClass* data) :
      myObj(data ? data->x : MyClass()) --compile error

Version 2)

C++

MyClass2(const AnotherClass* data) :
      myObj(data ? data->x : MyClass my) --synatax error

I get the following error: error: no match for ternary 'operator?:' in ...

How could i fix this?
Thanks

Re: Question about ternary operator in initializer list

jschell12-Sep-12 8:13

Re: Question about ternary operator in initializer list

12-Sep-12 8:13

Just put it into the the ctor body

MyClass2(const AnotherClass* data)
{
   if (data)
     myObj = data->x;
}

Richard MacCutchan12-Sep-12 22:32