Data type modifiers

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Data type modifiers in C

In c language Data Type Modifiers are keywords used to change the properties of current properties of data type. Data type modifiers are classified into following types.

  • long
  • short
  • unsigned
  • signed

Modifiers are prefixed with basic data types to modify (either increase or decrease) the amount of storage space allocated to a variable.

For example, storage space for int data type is 4 byte for 32 bit processor. We can increase the range by using long int which is 8 byte. We can decrease the range by using short int which is 2 byte.

long:

This can be used to increased size of the current data type to 2 more bytes, which can be applied on int or double data types. For example int occupy 2 byte of memory if we use long with integer variable then it occupy 4 byte of memory.

datatype Modifiers images

Syntax

long a;  --> by default which represent long int.

short

In general int data type occupies different memory spaces for a different operating system; to allocate fixed memory space short keyword can be used.

Syntax

short int a; --> occupies 2 bytes of memory space in every operating system.

unsigned

This keyword can be used to make the accepting values of a data type is positive data type.

Syntax

unsigned int a =100;	// right
unsigned int a=-100;	// wrong

Signed

This keyword accepts both negative or positive value and this is default properties or data type modifiers for every data type.

Example

int a=10;	// right
int a=-10;	// right
signed int a=10;	// right
signed int a=-10; 	// right

Note: in real time no need to write signed keyword explicitly for any data type.


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Path variable is set for providing path for all Java tools like java, javac, javap, javah, jar, appletviewer which are used in java programming. All these tools are available in bin folders so we set path upto bin folders.

Classpath variable is set for providing a path for predefined Java classes which is used in our application. All classes are available in lib/rt.jar so we set classpath upto lib/rt.jar.

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