Re: [Dev-C++] structs

[Per W. <pw...@ia...>]

Maya - try compiling your examples :-)

This is a construct that is affected by language.

In C:

struct Human {
...
};

Require you to always declare your variables as:
struct Human a_human;

In C++ - together with the addition of the class keyword - you can get
away with:

struct Human {
...
};

Human a_human;

or
class Human {
public:
...
};

Human a_human;

So basically:

typedef struct Human {
...
} _Human;

declares a structure named Human, and typedef this struct to the name
_Human.

In C, you can then declare a variable as either of:
struct Human a_human; /* referencing the name of the struct */
_Human a_human; /* referencing type typedef name */

while in C++ it doesn't matter. It is even possible to define the data
type as:
typedef struct Human {
..
} Human;
i.e. same name for the struct declaration and for type typedef.

/Per W

On Sat, 31 Jan 2004, Maya wrote:

> In the first one you have declared a struct named _Human and
> instantiated it right after the declaration with name Human. In your
> program you can just say for instance: " Human.height = 1.70 " and it
> will work
> Here is another example:
> typedef struct _Human {
>   int height;
> }Human;
>
> int main(){
> std::cout << "The Human Project" << std::endl;
> std::cout << "How tall are you " ;
> std::cin >> Human.height;
> return 0;
> }
>
> In the second example you have declared a struct named Human, but has
> not yet been instantiated.
> Your code would look something like this
>
> struct Human {
>  int height;
> };
> int main(){
> Human human; // Instantiating the Human struct
> std::cout << "The Human Project" << std::endl;
> std::cout << "How tall are you " ;
> std::cin >> human.height; // <<==
> return 0;
> }
> Which one is better? it depends on the program you are working on, really!
>
> Hava a good one!
> coo...@ho... wrote:
>
> > what is the difference between these two
> >
> > typedef struct _Human
> > {
> >   int height;
> > }Human;
> >
> > struct Human
> > {
> >  int height;
> > };
> >
> >
> > and in the first one, what does 'Human' mean at the end? In both
> > structs u can declare a Human type, even without the Human thing at
> > the end in the first one
> >
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