Data Types in C++

Data types define the type of data a variable can hold, for example an integer variable can hold integer data, a character type variable can hold character data etc.

Data types in C++ are categorised in three groups: Built-in, user-defined and Derived.

Built in data types

char: For characters. Size 1 byte.

char ch = 'A';

int: For integers. Size 2 bytes.

int num = 100;

float: For single precision floating point. Size 4 bytes.

float num = 123.78987;

double: For double precision floating point. Size 8 bytes.

double num = 10098.98899;

bool: For booleans, true or false.

bool b = true;

wchar_t: Wide Character. This should be avoided because its size is implementation defined and not reliable.

User-defined data types

We have three types of user-defined data types in C++
1. struct
2. union
3. enum

I have covered them in detail in separate tutorials. For now just remember that these comes under user-defined data types.

Derived data types in C++

We have three types of derived-defined data types in C++
1. Array
2. Function
3. Pointer

They are wide topics of C++ and I have covered them in separate tutorials. Just follow the tutorials in given sequence and you would be fine.