How can I make my custom data types?

Question

How can I make my own data type? I know in Pascal language, I can use

type dat = longint;

To make a new data type called "dat" that is equivalent to long int.
How can I do that in c++ ? For example I want to make a data type called "dat" that is equivalent to "long long int". How can I do it?

Thanks in advance!

Answer 1

Typdef is also a way you can do this.
Type def is not actually creating new data type but it rename another data type to custom type.

Syntax :
typedef data-type name;

For example :
You want to create int type data type then you can use it like :
typedef int my_datatype;

Answer 2

Thanks so much!