Data types in C

Data types in C language

• Always data types will decides that what type of data need to be hold in a variable.
• in ‘c’ programming language, there are 3 type of basic data types are available i.e int,float, char.
• In implementation whenever the predefined data type is not supporting . User requirement then extend size and range of predefined data types i.e primitive data types are required
• In ‘c’ programming language, there are ‘9’ types of predefined or primitive data types are available , those are

   

Type	Type	Range	%	Ex
Char	1 byte	-128 to 127	%c	‘a’ ‘A’ ‘#’ ‘\n’
Unsigned char	1 byte	0 to 255
Int	2bytes	-32,768 to 32767	%d	-25 5 0   -5
Unsigned int	2 bytes	0 to 65,535	%u	327684
Longint	4 bytes	-2,147,483,648 to+3147,483,647	%ld+51-51	400001
Unsigned long	4 bytes	0 to 4,294,967,295		100lu51lu
Float	4 bytes	+or-3.4*10*+or-38	%lu	-3.5 7.5f
Double	8 bytes	+or- 1.1*10*+or-	%f	-3.5 7.5
Long double	10 bytes	308+or-3.4*10*+or-9932	%lf%Lf	-3.5L 7.5L

     

• The basic advantage of classifying this many types nothing but utilizing the memory more efficiently and increasing the performance.
• In implementation, when we require character operators then recommended to go for unsigned cap data type.
• In implementation, when we require the numeric values from the range of -128 to 128 then go for char data type in place of constructing an integer, in this case, we require to use %d format specifier
• When we require the numeric values from the range of 0 to 255 then go for unsigned char data type in place of constructing unsigned integer, in this case we require to use %u format specifier.
• For normal numeric operation, go for an int type, if there is no any negative representations are available like Employee salary then recommended to go for unsigned int type.
• Signed , unsigned, short and long are called “Qualifiors”
• signed, unsigned indicates sign specifications
• short & long indicates size specifications.
• This all qualifiers we require to use for an integer data type only. i.e we can’t use for float, double and long double.
• By default , any type of integral variable type sign is signed type, size is short type.

       

• void main()

{ int i; long int l; float f; i=32767+1; l=32767+1; f=32767+1; printf(“%d%ld  %f”,i,l,f); } o/p: 32768                   -32768       -32768.000000    

Arithmetic operations on data types:-

int , int     int int, char      int signed int, unsigned int      signed int signed , unsigned -    signed int, long int      long int int,float      float float, long int      float float, double    double double, long double      long double.

• if both arguments are same type then return value is same, if both arguments are different then among those two, bigger one will be the return value.
• When we are working with an integral values with the combination of float, then return value is float type only.

     

• void main()

{ int i, long int l; float f; i=32767+1; l=32767l+1;                  // l=(long int) 32767+1; f=32767.0f+1;              // f=(float)32767+1; printf(“%d      %ld    %f  ”,i,l,f); } o/p : -32768       32768        32768.000000