Raj is an ardent coder who loves exploring new technology. He is an IT pro with 9 years of exp in C#, Angular, React, Vue.
A programming language helps us process certain kinds of data by providing useful output. The task of data processing is accomplished by executing a series of commands called a program. A program usually contains different types of data, such as integer, float, character etc. A program stores the values being used along with a library function and the user defined function (UDF) to process that stored data. C language is rich in data types and library functions.
C data types can be broadly classified as :
- Primary data types
- Secondary data types
Data Types in C
Primary Data Types in C Language
Primary data types include the following:
Integer Data Type
- Integers are whole numbers with a range of values, the range limits being machine dependent.
- Denoted by the keyword int.
- Generally an integer occupies 2 bytes memory space and its value range is limited to -32768 to +32767 (that is, -215 to +215-1).
- A signed integer uses one bit for storing the sign and 15 bits for the number.
To control the range of numbers and storage space, C has three classes of integer storage:
- short int
- long int
A short int requires half the amount of storage than normal integer. The long integers are used to declare a longer range of values and it occupies 4 bytes of storage space.
All three data types have signed and unsigned forms.
- Unlike signed integers, unsigned integers are always positive and use all the bits for the magnitude of the number. Therefore the range of an unsigned integer will be from 0 to 65535.
Syntax: int <variable name>; like
short int num2;
long int num3;
Example: 5, 6, 100, 2500.
Integer Data Type Memory Allocation
Primary Data Types in C: Float
- The float data type is used to store fractional numbers (real numbers) within 6 digits of precision.
- Floating point numbers are denoted by the keyword float.
- When the accuracy of the floating point number is insufficient, we can use the specifier "double" to define the number. “Double” is the same as “float” but has double the precision and takes up twice as much memory space (8 bytes) as float.
- For even more precision we can use “long double” which occupies 10 bytes of memory space.
Syntax: float <variable name>;
long double num3;
Example: 9.125, 3.1254.
Floating Point Data Type Memory Allocation
Primary Data Types in C: Character
- The character type variable can hold a single character.
- "Char," like "int," may be singed or unsigned. Both signed and unsigned occupy 1 byte each but have different ranges. Unsigned characters have values between 0 and 255; signed characters have values from –128 to 127.
- Denoted by char.
Syntax: char <variable name>;
char ch = ‘a’;
Example: a, b, g, S, j.
Primary Data Types in C: Void
- The “void” data type returns no data; it is not a variable like the other types. It may be used with functions that need to be run without returning any values.
- For example, we can declare “main()” as a void type because it does not return any value.
User-Defined Type Declaration in C Language
C language supports a feature where the user can define the identifier that characterizes an existing data type. This user-defined data type identifier can later be used to declare variables. In short, its purpose is to redefine the name of an existing data type.
Syntax: typedef <type> <identifier>;
Example: typedef int number;
Now we can use number in lieu of int to declare integer variable. For example: if we enter int x1 or number x1 both statements declare an integer variable. We have just changed the default keyword int to declare integer variable as number.
Size and Range of Data Types in C Language
Secondary Data Types in C Language
- Arrays: collections of data of a similar type.
- Pointers: a way to refer to information by referring to the address where the information is kept.
- Structures: a way of associating data of different types.
- Unions: a way of allowing the same data to be read as data of different types.
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what is an array in c programming, this tutorial explains it with example and line by line explanation.
© 2009 RAJKISHOR SAHU
Obzy on June 29, 2017:
What is the size and range of viod
diksha koushal on January 20, 2015:
nicomp really from Ohio, USA on January 13, 2015:
The char type should not be confused with a character. It's simply a 1-byte integer, usually. It can 'hold' any integer value within the given range. A one-byte signed char, for example, has the range -128 through +127.
Aadil Syed on September 10, 2014:
awesom programing c but its vry complicated......
nikita on July 25, 2013:
thanks for information
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thanks its very easy to understand,not any confuse
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please give me all notes of c langauge with programme........
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RAJKISHOR SAHU (author) from Bangalore, Karnataka, INDIA on January 24, 2013:
Well said @sonuxrt, I published this article on this site on 04/07/2009 and that site came into existence on Sat, 26 Nov 11 11:14:14 +0400 see link http://eazynotes.com.whoisbucket.com I didn't know know that I am so good in copying content :P.
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Don't copy from another website
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ALI on December 01, 2012:
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By this answer am very helpful,..thanks keep on.
ramesh on July 12, 2012:
ian05 on July 07, 2012:
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jhezrylle on June 20, 2012:
anu po ung mga Variables ng c language?/
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thanks for visiting my friend...
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plz tell me about the problems of floating point used in c programming language.plz tell me ans as soon as possible
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what is abstract datatype?
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can u tell me where the data type store in comp.memory
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why we need range for datatype like int as -32708 to 32627?
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need to few is described
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if knw the correct ans den only post otherwise don't post..............don't misguide to people.......plz
who told u dat structure is NOT user defined data type,,,,,,,,,,,,,,,,,,,,buddy
its user defined data type ..pgmer only define types of variables which u Want..................so plzzzzzzzzzzz u knw correcr n accurate ans den post otherwise don't post
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for double %lf & for long double %Lf, for short signed int %d, short unsigned int %u.
INSI on January 19, 2012:
WAT IS USE OF * IN SCANF STATEMAENT?
dude on January 17, 2012:
how can i print these data types i mean like %d for integer... what for double, long double and short int etc
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thank's for deeply information
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Nibedita Swain on January 04, 2012:
What variable? explane pointer variable
md wakash ahmad on January 04, 2012:
why uses # in c program
please reply this topic on that site
kanchan Pande on December 29, 2011:
Can any one tell me,that there are how many data types included in C and C#.
Sanket Sathe on December 26, 2011:
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what's the mean by recursion?
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what are data types in c?
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no compiler not depend on variable..........
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Jst a question that U have not used in data types that is ''Format'' of these data types.Plz justify if so........
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what is the importance of the sizes of the data types in c language?
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chitti on November 18, 2011:
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Ravi on November 13, 2011:
The C programming language is a standardized programming language developed in the early 1970s by Ken Thompson and Dennis Ritchie foruse on the UNIX operating system. It has since spread to many other operating systems, and is one of the most widely used programming languages. C is prized for its efficiency, and is the most popular programming language for writing system software, though it is also used for writing applications.
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if we have an intrest, then can we learn this subject very easily,,,,,
RAJKISHOR SAHU (author) from Bangalore, Karnataka, INDIA on November 12, 2011:
@Parvez size of any data type is compiler dependent.
ruji on November 12, 2011:
what is c plz tell me ....
Parvez on November 12, 2011:
Why dos integer datatype in c take 4 bytes in visual studio ?
plsss reply back!!!
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what is the use of %u in c language
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suyash47 on October 23, 2011:
Array in C programming
An array in C language is a collection of similar data-type, means an array can hold value of a particular data type for which it has been declared. Arrays can be created from any of the C data-types int,...
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i want to know about c, its very intresting, but also hard for me.
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