The document explains the concept of datatypes in programming, particularly in the C language, emphasizing the importance of variables and constants for holding values. It provides examples of different datatypes, their storage sizes, value ranges, and syntax for declaration and usage. Additionally, it discusses the printf function for formatted output in C with various format specifiers.

4. Example :-
When customer goes to a fruit vendor….

5. Need of Datatypes in programming
vendor: what do u want sir/madam.
Customer: I want apple. How much does it costs?
Vendor: How many do u want sir/madam.
Customer : Answers according to his/her requirement.which
is a variable x( which changes every time).
Vendor : Now he calculates the rate(c.p + profit) and sells the
apples.
In order to do this calculation in programming we need a thing
that can hold a value (a number like 5 or 20 etc)
That’s where we need

6. Variable and constant

7. Syntax of Datatypes in C
In the example:
• Number of apple he /she wanted. <value>
• Customer asked for apples. That identifies what he wants.
<identifier name>
• To store this value we need a box in programming which is a type
integer in C<type>
Format for Datatypes declaration and definition is :
<type> <identifier name>=<value>
Ex:
Int apples =20;

8. Types of Datatypes
Datatype Use to hold Example
int for integer range numbers -5
float for decimal range numbers 99.99
char for character numbers A
double for more precision decimal numbers 99.999999
* Long <datatype> for hold big numbers 34,333
* short <datatype> for value inside 32,768 8987
signed <datatype> **for only positive numbers 88
Unsigned<datatype> **for positive and negative numbers -96
•Except char Datatype.
•In char we have -128 t0 127 range for unsigned char and 0 to 255 for signed char

9. Sizeof
This will give u the size(int value) of the variable.
Syntax:-
sizeof(<identifier name>);
Example:-
int a,b;
b=sizeof(a);

10. Table of Datatypes
Type *Storage size Value range
char 1 byte -128 to 127 or 0 to 255
unsigned char 1 byte 0 to 255
signed char 1 byte -128 to 127
int 2 or 4 bytes
-32,768 to 32,767 or -2,147,483,648
to 2,147,483,647
unsigned int 2 or 4 bytes 0 to 65,535 or 0 to 4,294,967,295
short 2 bytes -32,768 to 32,767
unsigned short 2 bytes 0 to 65,535
long 4 bytes -2,147,483,648 to 2,147,483,647
unsigned long 4 bytes 0 to 4,294,967,295
*Size depends on how many bit processor u r running on

11. Types of Datatypes(cont..)
Type Storage size Value range Precision
float 4 byte 1.2E-38 to 3.4E+38 6 decimal places
double 8 byte 2.3E-308 to 1.7E+308 15 decimal places
long double 10 byte 3.4E-4932 to 1.1E+4932 19 decimal places

12. Printf advance…
Syntax:-
Printf(“<format string>”,<list of arguments>);
Format string:-
• %c char single character
• %d (%i) int signed integer
• %e (%E) float or double exponential format
• %f float or double signed decimal
• %g (%G) float or double use %f or %e as required
• %o int unsigned octal value
• %p pointer address stored in pointer
• %s array of char sequence of characters
• %u int unsigned decimal
• %x (%X) int unsigned hex value
Example:
Printf(“text %d”,apples);

15. Additional links
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