Could you please give an example how to create and an array of objects and how to delete them ?
Do I have to create for loop to delete all of them?
mickey22
Last Activity: Sep 8 '08, 12:40 PM
Joined: Feb 20 '07
Location:
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deleting an array of objects
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Thank you for the reply.
ptr++ in the second case increases by 40 ----- does it mean that ptr++ means it points to the last element of the array it is pointing to?
If I want to acess some middle element how do I call through this pointer.
For eg: a[]={1,2 ,3,4};
int (*ptr)[4];
if I want to print out a[2]=3 using *ptr how can i do it? -
debug vs release version
Hi all,
I have some theoritical questions.
1. Why sometimes any piece of code works fine in th debug version and fails in the release version ?
could anyone please state the difference between relase and debug version?
2. int *ptr[10]; //10 pointers pointing to an integer
what happens if we do ptr++ ?What should I do if I want to acess all the pointers?
int(*ptr)[10];... -
Actually I have solved using the copy function memcpy and just copied the data pointed by data1 to pointer data2.Now I dont have any problem in the delete operations .
thanks a lot .Leave a comment:
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yes I have observed there is memory leak when I copy the adresses of the pointers and delete them in class A and class B.Thats where I get an error when I try to peform delete in class A.
delete[] data2;
How can I copy the values pointed by data2 to data1 point to the same values having data1 and data2 as different adresses so that I can delete them in both the classes?Can you suggest me the way?Leave a comment:
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Hi all,
When I initialise in this way,
b::b(float *_data2)
{
data2 = new float(*_data2);
}
copying of the data from class A is not done properly.data2 contains some weird values.
So I tried to do as:
b::b(float *_data2,int _x,int _y)
{
x=_x;
y=_y;
data2=new float[x*y];
data2=_data2;
}
I get a...Leave a comment:
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Thank you ..using new operator solved my problem.
One question: is it not required to initialise data2 in class B to NULL before using new operator?
If yes can I intialise in this way :
data2=NULL;
data2=new float(*_data2);Leave a comment:
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delete operation
I have created a pointer to a data in a class A and passing this pointer to a function in another class B.when I try to delete this pointer in class A I get run time exception.
But if I dont delete the object of class B I dont get any error it runs fine.But I have to delete the object of class B.I have illustrated theexample..Cou ld anyone help with it?
[CODE=cpp]//func2.h
class b
{
private:... -
clearing the data in a file
I have a file already written and I want to clear all the contents in it.
code:
int number=10;
FILE *fp;
fopen_s(&fp,"a. txt","a");
/////want to clear the data here in a.txt file
fprintf(fp,"%d" ,number);
fclose(fp);
after opening the file I want to clear all the contents first and then print the number in the a.txt.I... -
Displaying decimal numbers in C++
Hi all,
I want to specify a limit of numbers to be printed after the decimal point .Could anyone tell me what to use in vc++ ?
eg: 5.3446785
I want to print just 5.34467
Thanks. -
I just tried in the same way writing separately..It works fine.When I include some other statements it does'nt work.Its really wierd.
Thanks for all the suggestions.Leave a comment:
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Problem with the while statemnet
I have some problem in execution of the program :
the code is for example:
void a (float value)
{
float size=0;
size=value;
while(size>=val ue)
{
some statements
}
when I print the values of size and value, they are the same.but it is
not entering the while loop even though the condition is true.If I just write some
cout statement... -
I removed NULL. It did not work.
I have my code in this way:
my own class
[CODE=cpp]///abc.h
class abc
{
int off;
int *img;
abc(void);
~abc( );
void sum( );
};
//abc.cpp
abc::abc(void)
{
off=0;
}
abc::~abc( )
{
delete[] img;
}
...Leave a comment:
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delete operator in c++
Hi all,
I have a class say A and created a pointer to call this class like
A *obj=NULL;
obj=new A( );
After I perform all the operations within the code and try to delete this pointer using
delete obj;
obj=NULL;
I get an exception as
" the instruction at "0x7c910f 2b" REFERENCED MEMORY AT "0x00000004".th e memory could not be... -
I just tried including the template definition inside test.h instead of in the test.cpp.I don't get any linker errors when I call in the same way using the object.
But including the definition in the header file is not optimal solution.Is there any other way of doing this?
ThanksLeave a comment:
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the code I have wriiten just as an example..To clear the things, I have declared the function as public and main also I have specified as
int main( )
I am compiling test.cpp and main.cpp together at the same time.
I am not able to undestand how to call my my template function in the main using the object..I have to give my template T as float.My guess is the way I am calling template function is something...Leave a comment:
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Calling of template function
Hi all,
I have a template function implemented in test.cpp.
test.h
[code=cpp]
class test
{
template<typena me T>
void function1( );
}
test.cpp
{
template<typena me T>
test::function1 ( )
{
statements
}
}[/code]
Now I have my main program
main.cpp
[code=cpp]
#include"test.h "... -
The problem is that I have called ofstream("resul ts.txt",ios::ou t); in a function say function1 and I have to call this function from function2 .
Each time I call this function1 from function2 the above statement fstream is being called and ios::out is creating new output file.
In case if I place ios::app I am not able to clear the contents when I run the program each time.
In what way can I...Leave a comment:
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It works well without any warning when I run on 32 bit machine, the 32 bit code.
But I just tried compiling simple example like just a cout statement it works fine.Leave a comment:
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Application error in vc++
Hi all,
I have a console application in vc++ and I wanted to generate an executable of 32 bit on 64 bit machine (windows). I dont get any compile or linking errors, but when I try to run the excutable I get the error as :
"The application failed to initialize properly (0XC000007b).Cl ick on OK to terminate the application. "
When i am running the same code on 32 bit machine it works fine.
...
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