Array Implementation Using C++

[kharthi 0]

Hi, I need to implement a class cppArray which is identical to a one dimensional C++ array. It should perform range checking(index set is a set of consecutive integer from 0). It allows only one array to be assigned to another array using = operator. Supports a function that returns the size of an array. It allows reading and printing through use of cout and cin. Immediate response will help out a lot, thanks in advance!

Edited September 28, 2011 by kharthi (see edit history)

[mcddictator 0]

Hi,

 

I need to implement a class cppArray which is identical to a one dimensional C++ array. It should perform range checking(index set is a set of consecutive integer from 0). It allows only one array to be assigned to another array using = operator. Supports a function that returns the size of an array. It allows reading and printing through use of cout and cin. Immediate response will help out a lot, thanks in advance!

 

Sizeof array ?

 

string str[] = {"123","456","789"}

cout<<"Array size:"<<sizeof(str)/sizeof(str[0]);

 

output:

Array size:3

 

Is that what you want?

[iGuest 3]

Yes.. Thank you. But, can you please help out in sorting the other questions I have asked.

[multfilm 0]

So... for the range checking, you could do something likeif (index >= sizeof(str)/sizeof(str[0])) return -1; (error)SizeOf array could be kept as a separate variable.For COUT, you could just forward it to the printf("%s", str); method.Is there anything else?

[k_nitin_r 8]

The sizeof operation does work for arrays in C when you use it in the same scope that the array was declared, but the moment you pass the array as a parameter, the array degrades into a pointer and you won't have any way of determining the size other than by passing in the size of the array as a parameter. I am guessing that the compiler can tell what the size of an array is, but the size is not maintained at run time so you have to define a variable to keep track of the size, if you intend to pass the array to a function at some point.In either case, you could drop the use of arrays entirely and use dynamically allocated memory because arrays are typically of a fixed size (ignoring the extensions that some compilers lend to the C language) and if you allocate too much space for an array, you're either wasting space or you will run out of stack space eventually.