DaniWeb Forum Index > Software Development > C++

C++ RSS

Using a char pointer and cin.getline()

Please support our C++ advertiser: Intel Parallel Studio Home

Thread Solved

•

Join Date: May 2009

Posts: 8

Reputation: Deme is an unknown quantity at this point

Solved Threads: 0

Deme

Offline

Newbie Poster

Using a char pointer and cin.getline()

May 7th, 2009

Well, what i'm trying to do is use cin.getline with my char pointer of 255 characters, take a look at the code below:

 Help with Code Tags 
 C++ Syntax (Toggle Plain Text) 
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <conio.h>
 
using namespace std;
 
char * pChar[255];
pChar = new char[255];
 
void newPointer()
    {
                 delete pChar;
                 pChar = new char[255];
    }
 
 
int main(int argc, char *argv[])
{
    cout << "Enter a line of text: ";
    cin.getline(pChar, 255);
    void newPointer();
 
    cout << "Enter another line of text: ";
    cin.getline(pChar, 255);
    delete pChar;
 
    cin.get();
    return EXIT_SUCCESS;
}
#include <cstdlib>
#include <iostream>
#include <fstream>
#include <conio.h>

using namespace std;

char * pChar[255];
pChar = new char[255];

void newPointer()
    {
                 delete pChar;
                 pChar = new char[255];
    }
                 

int main(int argc, char *argv[])
{
    cout << "Enter a line of text: ";
    cin.getline(pChar, 255);
    void newPointer();
    
    cout << "Enter another line of text: ";
    cin.getline(pChar, 255);
    delete pChar;
    
    cin.get();
    return EXIT_SUCCESS;
}

Am I doing something wrong or what? If you want I can copy and paste the error codes I get from it, they're confusing. Thanks, I appreciate all the help I can get.
=D

•

Join Date: Apr 2009

Posts: 219

Reputation: NathanOliver is an unknown quantity at this point

Solved Threads: 37

NathanOliver NathanOliver is offline

Offline

Posting Whiz in Training

Re: Using a char pointer and cin.getline()

May 7th, 2009

for this part of code

 Help with Code Tags 
 c++ Syntax (Toggle Plain Text) 
 
char * pChar[255];
pChar = new char[255];
 
char * pChar[255];
pChar = new char[255];

you do not want to declare pchar with its elements. you save that for the new operator part. so you would want to do this

 Help with Code Tags 
 c++ Syntax (Toggle Plain Text) 
char * pChar;
pChar = new char[255];
char * pChar;
pChar = new char[255];

also when you delete an array you always want to place the array operator before the name of the array. otherwise you will just delete the head of the array but the rest of it will still be sitting there in memory taking up resources until your application exits.
make sure you alway use delete [] variable_name; also it is always a good idea to set your pointer to null after deleting it. deleting a pointer that has already been deleted is guaranteed to crash your system but deleting a null pointer is safe.

if you write using namespace std; you do not need to write std::something in your program.
If your thread is solved please mark it as solved

•

Join Date: Dec 2007

Posts: 360

Reputation: jencas is just really nice

Solved Threads: 69

jencas

Offline

Posting Whiz

Re: Using a char pointer and cin.getline()

May 8th, 2009

•

Originally Posted by Deme

Help with Code Tags

C++ Syntax (Toggle Plain Text)
...
int main(int argc, char *argv[])
{
    ....
    void newPointer(); // that's NOT a function call!!!
    ...    
}
... int main(int argc, char *argv[]) { .... void newPointer(); // that's NOT a function call!!! ... }

I marked another problem with a comment!!!