Dynamically allocating an array of pointers

[bintom]

We can dynamically allocate memory using the 'new' operator.

char *cptr = new char[21];

Now, I'm trying to dynamically allocate 3 strings with the following
code on Dev C++. However, an error message 'Invalid initializer' is
generated. Can anyone tell me how to do it correctly?

char *cptr[3] = new char[3][21];

Thanks,
Bintom

 

[Sjouke Burry]

We can dynamically allocate memory using the 'new' operator.

char *cptr = new char[21];

Now, I'm trying to dynamically allocate 3 strings with the following
code on Dev C++. However, an error message 'Invalid initializer' is
generated. Can anyone tell me how to do it correctly?

char *cptr[3] = new char[3][21];

Thanks,
Bintom

Make the array def equal on both sides?
Like optr is a pointer to a char array[3][21]?

 

[Miles Bader]

Now, I'm trying to dynamically allocate 3 strings with the following
code on Dev C++. However, an error message 'Invalid initializer' is
generated. Can anyone tell me how to do it correctly?

char *cptr[3] = new char[3][21];

char *cptr[3];
for (unsigned i = 0; i < 3; i++)
cptr = new char[21];

-miles

 

[Miles Bader]

Now, I'm trying to dynamically allocate 3 strings with the following
code on Dev C++. However, an error message 'Invalid initializer' is
generated. Can anyone tell me how to do it correctly?

char *cptr[3] = new char[3][21];

char *cptr[3];
for (unsigned i = 0; i < 3; i++)
cptr = new char[21];

Hmm, I guess you really want this maybe:

char (*cptr)[21] = new char[3][21];

-miles

 

[bintom]

Hey Miles,Your apology makes a lot of sense to me. Thanks,

Bintom

 

[$|\\/@]

Hey Miles,Your apology makes a lot of sense to me. Thanks,

Bintom

in my college lab exercise we did the following for int data type.
Hope it works incase of char.

char **temp;
*temp = (char *)malloc(3*21);

 

[Ian Collins]

in my college lab exercise we did the following for int data type.
Hope it works incase of char.

char **temp;
*temp = (char *)malloc(3*21);

That's bad on two counts:

1) You dereference temp before assigning to it.
2) You pass a magic number 3*21 without explanation.

and you cast the return on malloc!

 

[Ian Collins]

That's bad on two counts:

1) You dereference temp before assigning to it.
2) You pass a magic number 3*21 without explanation.

and you cast the return on malloc!

Oops, as the code looked like C, I assumed it was!