DMA & String Pointers

[matthewmpp]

Hi,

I am trying to teach myself C++, and really appreciate your time & help.
This program is supposed to dynamically create an array of type string that
will hold the actors names. The program compiles okay & begins to execute okay,
but then I get weird memory address stuff for the rest of the program execution
and then the program aborts. Can you please tell me what is causing the weird output.

Sample Output:
matthewmpp@anthonyrogers:/usr/ Data/Notes/LAMP/Programming/Programs/Cpp_progs/Personal$ ./sort_stars_v2
Please enter the number of stars you would like to enter: 5
Please enter a star followed by a '#': Arnold#
Please enter a star followed by a '#': John Wayne#
Please enter a star followed by a '#': Jimmy Stewart#
Please enter a star followed by a '#': Danny Kaye#
Please enter a star followed by a '#': Anne Sheridan#
*** glibc detected *** ./sort_stars_v2: double free or corruption (fasttop): 0x00000000024b4080 ***
======= Backtrace: =========
/lib/x86_64-linux-gnu/libc.so.6(+0x78a8f)[0x7f214052fa8f]
/lib/x86_64-linux-gnu/libc.so.6(cfree+0x73)[0x7f21405338e3]
/usr/lib/x86_64-linux-gnu/libstdc++.so.6(_ZNSsD1Ev+0x39)[0x7f2140d83019]
./sort_stars_v2[0x400bd6]
/lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xff)[0x7f21404d5eff]
./sort_stars_v2[0x4009e9]
======= Memory map: ========
00400000-00401000 r-xp 00000000 08:11 4850366

// Program - Sorting Stars with pointers.

#include <iostream>
#include <iomanip>
#include <cctype>
#include <cstring>
#include <string>

using namespace std;

int main ()
{
	int num_stars = 0;

	cout 	<< "Please enter the number of stars you would like to enter: ";
	cin		>> num_stars;

	string* pstars = 0;
	pstars = new string[num_stars];

	for(int i = 0; i < num_stars; i++)
	{
		cout 	<< "Please enter a star followed by a '#': ";
		getline(cin, *(pstars+i), '#');
	}

	delete [] pstars;
	delete pstars;
	
	
	
	return 0;
} 

[LB]

Remove line 28 and the evil presence will disappear. Also, on line 24, it's easier to use pstars[i] but either way works the same (same machine code). Lines 4, 5, and 6 - you don't need those for this program.

[iLUjLyTq]

You're freeing memory two times on the same pointer. Use just the first delete.

[matthewmpp]

Okay, I deleted lines 4, 5, 6, & 28. Now the code works correctly. Thanks.