1. C Data Types and Variable

2. Definition
Data types are declarations for memory locations or variables that determine the characteristics of the data that may be stored and the methods (operations) of processing that are permitted involving them
Example: Integer, float, character
Before using variable it should be declared along with its datatype.
Variable declaration syntax:
Datatype variable_name

3. Static vs. Dynamic Typing
First, what does strongly typed mean?
Prevents invalid operations on a type
Statically typed: strongly typed and type checks can be performed at compile time
Ada, Pascal: almost all type checking done at compile time, with just a few exceptions
C, C++, Java, Ocaml
Dynamically typed: type checking is delayed until run time
Scheme, Smalltalk, Perl

4. Types:
Primitive
Derived
User defined
Void

5. Basic Datatype Size of these types on CLEAR machines:
Only really four basic types:
char
int (short, long, long long, unsigned)
float
double
Size of these types on CLEAR machines:
Size Varies from machine to machine

6. All datatype

7. Assignment A variable can be given value by means of assignment
Assignment operator (=) is used for assignment
Example:
int x;
x=5;

8. Initialization
Values are NOT initialized during declaration by default in c
If not initialized it may contain garbage value
So better to initilialize during declaration
Ex:
int x=0;
float product=1;

9. Display value of variable
printf() function can be used to display value of variable
Format specifier is compulsory to use
Example
printf(“value of x is %d”, x);
printf(“y=%f”,y);

10. Getting value from user
Commonly used function to get value for use is scanf()