This document discusses data types in C programming. It describes the primary (or fundamental) data types in C including integer types like int and unsigned int, floating point types like float and double, the void type, and character type char. Integer types store integers in 1, 2, or 4 bytes and have specific value ranges. Floating point types store numbers with decimal places with varying levels of precision in 4 or 8 bytes. The void type is used for functions that do not return or accept arguments. Char stores character values in 1 byte.

1. DATAT TYPES IN C
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2. DATA TYPES
char
void
float
int
Data types specifies the set of values and the type of
data that can be stored in memory. The type of a
variable determines how much space it occupies in
storage and how the bit pattern stored is interpreted.
ANSI C support 3 classes of datatypes
1. Primary(or fundamental) datatypes
2. Derived datatypes
3. User defined datatypes
The Primary data types and their extensions are
discussed in this presentation
1. Primary Datatypes
i. Integer Types
ii. Floating point types
iii. Void types
iv. Character types
Primary
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4. Integer data types
Type Storage size Value range
int (%d or %i ) 2 or 4 bytes
-32,768 to 32,767 or -2,147,483,648 to
2,147,483,647
unsigned int (%u) 2 or 4 bytes 0 to 65,535 or 0 to 4,294,967,295
short (%h) 1 or 2 bytes --128 to 127 or -32768 to 32767
unsigned short (%uh) 1 bytes 0 to 255
long (%ld) 4 bytes -2,147,483,648 to 2,147 ,483,647
unsigned long (%lu) 4 bytes 0 to 4,294,967,295
Short int
int
Long int
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5. Floating Point Type
Type Storage size Value range Precision
float (%f) 4 byte 1.2E-38 to
3.4E+38
6 decimal
places
double (%lf) 8 byte 2.3E-308 to
1.7E+308
15 decimal
places
long double (%L) 10 byte 3.4E-4932 to
1.1E+4932
19 decimal
places
long double
double
float
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6. void
• The void type has no values. This is usually used to specify the type of function.
It is used in three kinds of situations
• Function returns as void :There are various functions in C which do not return
any value or you can say they return void. A function with no return value has
the return type as void. For example, void exit (int status);
• Function arguments as void : There are various functions in C which do not
accept any parameter. A function with no parameter can accept a void.
For example: int rand(void);
• Pointers to void: A pointer of type void * represents the address of an object,
but not its type.
• For example: a memory allocation function void *malloc( size_t size ); returns a
pointer to void which can be casted to any data type.
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7. Character type (char)
Type Size(bytes) Range
char or signed char 1 -128 to 127
unsigned char 1 0 to 255
Character types are used to store characters value.
Size and range of char type on 16-bit machine
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