CODEWITHSUNDEEP
c++arrayspointers
DrSwiss
DrSwiss

Reputation: 21

Const char * as parameters of dynamic array

I had a quick question regarding a programming assignment that i'm currently working on. We are currently working on Dynamically Allocated Arrays.

I was able to set my "Book" object to default values / name in my constructor (using strcpy):

Book::Book() 
{
 strcpy(title, " ");
 strcpy(author, " ");
 price = 0.00;
}

However, in another function that was given in the assignement (Set function) I was unable to use the strcpy to do the same for the following:

void Book::Set(const char* t, const char* a, Genre g, double p)
{
    strcpy(title, *t);
    strcpy(author, *a);
    type = g;
    price = p;
}

My question is, how would I be able to take the information coming through the first "Const char * t" parameter, and set it to my private data char array named title[31] ?

This is my member data for my "Book" class btw:

private:
  char title[31];   // may assume title is 30 characters or less
  char author[21];  // may assume author name is 20 characters or 
  Genre type;       // enum Genre
  double price;

Let me know if I need to clarify anything,

Thanks again!

Upvotes: 2

Views: 866

Answers (2)

Mayhem50
Mayhem50

Reputation: 305

when you have questions about std functions, you should read the man. The prototype of strcpy is:

char *strcpy(char *dest, const char *src);

So when you write: strcpy(title, *t); it wouldn't compile. You should write: strcpy(title, t);

One advice, when you write names of attrib in class, you should uses _ before or m_ or m like this: _title, m_title, mTitle. Just because it's dangerous to have variable with one letter name.

Another, in c++ you should use std::string cause it's easier to manipulate chains of caracters.

Upvotes: 3

Kakalokia
Kakalokia

Reputation: 3191

Instead of 

strcpy(title, *t);
strcpy(author, *a);

write

strcpy(title, t);
strcpy(author, a);

This is because strcpy is expecting a pointer, and *t is not a pointer to the string.

Have a look here http://www.cplusplus.com/reference/cstring/strcpy/

Upvotes: 1

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