Datatype Modifiers in C++
In C++ language Data Type Modifiers are keywords used to change the properties of current properties of data type. Datatype modifiers are classified into following types.
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.
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.
long a; --> by default which represent long int.
In general int data type occupies different memory spaces for a different operating system; to allocate fixed memory space short keyword can be used.
short int a; --> occupies 2 bytes of memory space in every operating system.
This keyword can be used to make the accepting values of a data type is positive data type.
unsigned int a =100; // right unsigned int a=-100; // wrong
This keyword accepts both negative or positive value and this is default properties or data type modifiers for every data type.
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.