how to make our own data type ?

hello , i have a question .
how can i make a new data type!
for example i want to make a data that is capable of holding 3 char instead of 1 char .
for example see the following codes , im planning to do such a thing! if it is not possible how can i achieve my plan in this case?
storing a label in a label register (each element of label register is capable of holding a 3 characters (despite char that each element represents one character) ,so that whenever i need a specific label name , by referring to labelregister[index]. i can retrieve the name!
i tried using :
#define mychar char[3]
to make new data type capable of holding my labels ! but no luck!

mychar char[3];
mychar label[15];

char name[3];

label[0]=name;

how to do such a thing?

regards

Why do you need a data-type to store 3 chars? Usually, there might be a better solution.
Otherwise, you'd want a class to emulate your needs.

Quote:

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Originally Posted by Elysia

Why do you need a data-type to store 3 chars? Usually, there might be a better solution.
Otherwise, you'd want a class to emulate your needs.

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well as i mentioned before , im trying to have a register (an array ) that holds the labels(names) entered by user ,so that when i need a name , i can simply use index of that register and retrieve the name!
what are the other solutions?
and what about class !

It sounds like you need a map, and conveniently there is one in the STL: #include <map>

There is a tutorial on the website which can introduce the use of the class,
http://www.cprogramming.com/tutorial/stl/stlmap.html

for other issues see a reference:
http://www.dinkumware.com/manuals/?m...&page=map.html

With a little planning you should be ok.

Why don't you just use string ?
std::string is very good for your purpose.

But if you really need to define a type:

Code:

---

typedef MYSTRING std::string;

MYSTRING wow;
wow = "hello";

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What you might want is:
std::map<std::string, int> register;

So you can save your names in a register looked-up by index.

Quote:

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Originally Posted by citizen

It sounds like you need a map, and conveniently there is one in the STL: #include <map>

There is a tutorial on the website which can introduce the use of the class,
http://www.cprogramming.com/tutorial/stl/stlmap.html

for other issues see a reference:
http://www.dinkumware.com/manuals/?m...&page=map.html

With a little planning you should be ok.

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Quote:

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Originally Posted by execute

Why don't you just use string ?
std::string is very good for your purpose.

But if you really need to define a type:

Code:

---

typedef MYSTRING std::string;

MYSTRING wow;
wow = "hello";

---

---

Quote:

---

Originally Posted by Elysia

What you might want is:
std::map<std::string, int> register;

So you can save your names in a register looked-up by index.

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all of you dears many tanx . i really appreciate your answers