C++ Part 6
Data Types & Variable :
1. Built-in Data Types.
2. Derived Data Types.
3. User Defined Data Types.
4. Type Conversion.
5. Literals or Constants.
6. Keywords.
7. Variable declaration in C++.
Built-in Data Types.
There are four built-in data types in C++ :
- Integer data type
- Floating point data type
- Void data type
- Char data type
Integer Data Type
An integer is an integral whole number without a decimal point. These numbers are used for counting. For example 26, 272, -342 are valid integers. Normally an integer can hold numbers from -32768 to 32767.
Floating point Data Type
A floating point number has a decimal point. Even if it has an integral value, it must include a decimal point at the end. Valid floating point examples are 45.0, 34.23, -234.34.
Void Data Type
It is used for following purposes :
- It specifies the return type of a function when the function is not returning any value.
- It indicates an empty parameter list on a function when no arguments are passed.
- A void pointer can be assigned a pointer value of any basic data type.
Char data type
It is used to store character value in the identifier (variable/operand).
Derived Data Types.
C++ also permits four types of derived data types. As the name suggests, derived data types are basically derived from built-in data types.
There are four derived derived data types.
- Array
- Function
- Pointers
- Reference
We will study these data types in further chapters.