The document provides an overview of various data types in programming, including primary and secondary constants, built-in and derived data types. It discusses the concept of pointer variables and how they are assigned memory addresses of other variables. Examples are given for integer, float, and character types, along with syntax for defining and using pointers.

1. 02

2. x
5
24588
Pointer variable
24588

3. Integer
x
5
Real
y
3.14
ch
A
Character

4. Types of constant
Data Types
Primary Constants
Numeric
Integer
Secondary Constants
Non-Numeric
Real
Pointer
Character
Array
String
Structure
Union

5. Integer
x
5
Real
y
3.14
ch
A
Character

6. Types of constant
Data Types
Primary Constants
Numeric
Integer
Secondary Constants
Non-Numeric
Real
Pointer
Character
Array
String
Structure
Union

7. Data Type
Built – in Data Type
•int
•float
•char
Derived Data Type
•pointer

8. int *ptr;
*
ptr
ptr is pointer variable
int x;
ptr = &x;
&: Address Operator
x
ptr

9. float y;
char ch;
float *fptr;
char *cptr;
fptr = &y;
cptr = &ch;
x
ptr
ch
y
cptr
fptr