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regarding dynamic memory allocation
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Respected Sir/madam,
Could you help me in understanding the dynamic memory allocation
for a 3D matrix.
I have attached the file.I am allocating memory dynamically for the
3D matrix,which i am using in my project.
As per the concept when new is unable to allocate the specified memory
it will return NULL nalue,which can be used for the normal termination of the program.But when I give 1000 for a,b,c, it simply hangs,instead of
displaying the message "unable to allocate" and exit.
I use gcc 3.3.0.
Could you please tell me how to do that.
Thanks and regards
srishekh
Could you help me in understanding the dynamic memory allocation
for a 3D matrix.
I have attached the file.I am allocating memory dynamically for the
3D matrix,which i am using in my project.
As per the concept when new is unable to allocate the specified memory
it will return NULL nalue,which can be used for the normal termination of the program.But when I give 1000 for a,b,c, it simply hangs,instead of
displaying the message "unable to allocate" and exit.
I use gcc 3.3.0.
Could you please tell me how to do that.
Thanks and regards
srishekh
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>>when new is unable to allocate the specified memory it will return NULL
No it doesn't. c++ standards say that new throws an exception when there isn't enough memory, although Microsoft compilers may still return NULL as well. There may be better ways to code this exception handling routine, but this is the basic concept.
[edit] Just found this one too that doesn't throw an exception
No it doesn't. c++ standards say that new throws an exception when there isn't enough memory, although Microsoft compilers may still return NULL as well. There may be better ways to code this exception handling routine, but this is the basic concept.
C Syntax (Toggle Plain Text)
[edit] Just found this one too that doesn't throw an exception
C Syntax (Toggle Plain Text)
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> But when I give 1000 for a,b,c
Do the math - 1000 * 1000 * 1000 * sizeof(double)
Do you have 8GB of memory?
> if(dp==NULL)
Should be outside the first for loop, not inside.
Also, what's with all the printf/scanf inside a C++ program?
Do the math - 1000 * 1000 * 1000 * sizeof(double)
Do you have 8GB of memory?
> if(dp==NULL)
Should be outside the first for loop, not inside.
Also, what's with all the printf/scanf inside a C++ program?
Thank you for your replies.
I tried by putting printf outside the loop,even then instead of displaying
message, it hangs.
my gcc v3.3 doesnt support exception.
Will you please give me the solution.
I tried by putting printf outside the loop,even then instead of displaying
message, it hangs.
my gcc v3.3 doesnt support exception.
Will you please give me the solution.
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Join Date: Nov 2005
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Posting Whiz in Training
Link with -lstdc++ (or -lstdcxx under DOS), or use g++ (or gpp under DOS):
C Syntax (Toggle Plain Text)
dwk
Seek and ye shall find.
"Only those who will risk going too far can possibly find out how far one can go."
-- TS Eliot.
"I have not failed. I've just found 10,000 ways that won't work."
-- Thomas Alva Edison
"The only real mistake is the one from which we learn nothing."
-- John Powell
Seek and ye shall find.
"Only those who will risk going too far can possibly find out how far one can go."
-- TS Eliot.
"I have not failed. I've just found 10,000 ways that won't work."
-- Thomas Alva Edison
"The only real mistake is the one from which we learn nothing."
-- John Powell
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Posting Whiz in Training
Declare an array that will be dynamically allocated as
C Syntax (Toggle Plain Text)
dwk
Seek and ye shall find.
"Only those who will risk going too far can possibly find out how far one can go."
-- TS Eliot.
"I have not failed. I've just found 10,000 ways that won't work."
-- Thomas Alva Edison
"The only real mistake is the one from which we learn nothing."
-- John Powell
Seek and ye shall find.
"Only those who will risk going too far can possibly find out how far one can go."
-- TS Eliot.
"I have not failed. I've just found 10,000 ways that won't work."
-- Thomas Alva Edison
"The only real mistake is the one from which we learn nothing."
-- John Powell
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Join Date: Nov 2005
Posts: 251
Reputation:
Solved Threads: 25
Posting Whiz in Training
If you're using scanf() and printf(), you can use the C functions malloc() and free() instead of C++'s new and delete.
dwk
Seek and ye shall find.
"Only those who will risk going too far can possibly find out how far one can go."
-- TS Eliot.
"I have not failed. I've just found 10,000 ways that won't work."
-- Thomas Alva Edison
"The only real mistake is the one from which we learn nothing."
-- John Powell
Seek and ye shall find.
"Only those who will risk going too far can possibly find out how far one can go."
-- TS Eliot.
"I have not failed. I've just found 10,000 ways that won't work."
-- Thomas Alva Edison
"The only real mistake is the one from which we learn nothing."
-- John Powell
•
•
Join Date: Aug 2005
Posts: 15,342
Reputation:
Solved Threads: 1460
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Originally Posted by srishekh
my gcc v3.3 doesnt support exception.
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Originally Posted by srishekh
Thank you for your replies.
I tried by putting printf outside the loop,even then instead of displaying
message, it hangs.
my gcc v3.3 doesnt support exception.
Will you please give me the solution.
Sorry, I did mention gcc v3.3.
It is a typing mistake.
The compiler I use is : g++ 3.3
There is no problem in printf and scanf.
Problem is, why it doesnot display message when it can not allocate memory.
Any other alternative solution ,pls tell me.
srishekh
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