https://m.primal.net/Ilop.png 
1- Data Type : 

Primitive Data Types

A-int:

*Data type for an integer.

*Used to store whole numbers without fractions.

*Typical size: 4 bytes.

*Example: int age = 25;

B-char:

*Data type for a single character.

*Used to store a single character (like 'a' or '1').

*Typical size: 1 byte.

*Example: char grade = 'A';

C-float:

*Data type for a single-precision floating point number.

*Used to store decimal numbers.

*Typical size: 4 bytes.

*Example: float temperature = 36.6;

D-double:

*Data type for a double-precision floating point number.

*Used to store decimal numbers with greater precision than float.

*Typical size: 8 bytes.

*Example: double distance = 12345.6789;

E-bool:

*Data type for a boolean value.

*Used to store true or false values.

*Typical size: 1 byte (sometimes implemented as 1 bit).

*Example: bool isAlive = true;

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Derived Data Types : 

X- Array:

*A collection of elements of the same type stored in contiguous memory locations.

*Example: int numbers[5] = {1, 2, 3, 4, 5};

Y- Pointer:

*A variable that stores the memory address of another variable.

*Example: int* ptr = &age;

Z- Reference:

*An alias for another variable.

*Example: int& ref = age;