

Hi developers,
I am interested to so solve this chunk of code
void main() { int Var = 90; if(Var += Var == ++Var == 89) printf(" %d ",Var); }
After executing the code i m getting the answer "91"
I am really surprised with the answer. Infact, I am not clear with operator precedence in this problem. Please give some help for it.
Thanks. Amrit Agrawal, Mumbai





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.





Amrit Agr wrote: Please give some help for it.
Rewrite it so it is more maintainable.





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...





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, deepcopy copy constructor, overloaded constructor(s), destructor, deepcopy 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;
char * arr;
int size;
public:
BigInteger(int size=0);
BigInteger( const char* arr);
BigInteger( BigInteger& arr);
~BigInteger();
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.





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.





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.





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=(size1);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=(size21);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=(size31);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; for(int i=(size31);i>=0;i) cout<<arr3[i];
} void Integer::print() { for(int i=0;i<size;i++) cout<<arr1[i]; }
void Integer::addNumbers() { int carry=0; for(int i=0;i<size;i++){ arr3[i]=48+(arr1[i]+arr2[i]2*48+carry)%10; carry=(arr1[i]+arr2[i]2*48+carry)/10; } }
void Integer::subNumbers() { for(int i=0;i<size;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]; } } }





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.





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





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





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.





Hi,
I need a notification mechanism for windows shutting down prefferably wthout polling.
Any ideas? Thanks in advance.
Sunil





WM_QUERYENDSESSION [^] may be the message you need to check.
One of these days I'm going to think of a really clever signature.





Some dimwit had downvoted you for giving a valid answer.
"Real men drive manual transmission"  Rajesh.





Rajesh R Subramanian wrote: Some dimwit Extremely dim, I think. Thanks, your 40 points take me soaring to the sky again.
One of these days I'm going to think of a really clever signature.





And another counter.
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





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





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)
MyClass2(const AnotherClass* data) :
myObj(data ? data>x : MyClass()) compile error
Version 2)
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





Just put it into the the ctor body
MyClass2(const AnotherClass* data)
{
if (data)
myObj = data>x;
}





Your ternary expression makes no sense; if true it returns an integer, and if false it returns an object.
One of these days I'm going to think of a really clever signature.





hi, i'm chacha.. i have a trouble creating voic applications to image and from image to sound using C++ I asked for help and sample code,,please





First off, I dont undertand what you mean. Second; you should try something out before posting a question. This would make things clear to you and to the rest of us what you are trying to achieve, as iut is now, i doubt you would get any usful replies.





i want making the speech recognition application using c++,,please help me give pieces of programs(source code)or articles that can me make reference ? thx



