modifier and their type

Here we will discuss following,

 

modifier

Means to modify. We use the modifier in c ++ with the built in data type (except void). Using a modifier, you can increase the size of a variable or determine a variable which type of input will be taken by the end user,

 

Why we use modifier?

It can be understood in such a way that the information given by the user is more than the size of the variable size In this situation, the variable can not hold that information, in that case the modifier can be used with that data type .

let’s see in other words

for example, using modifier with int data type, we can store large form of number(maybe mobile no) or define a condition where we need to store only positive number e.g. a student’s rollno or age always a positive values. so we can use modifier with them. So that the end user could give the right input.

SYNTEX:

MODIFIER-TYPE DATA-TYPE VARIABLE_NAME;

C++ provide 4 types modifier

 

signed

This type of modifier stores both negative and positive values. By default an int data type is a signed type modifier which stores both types of value.

SYNTEX:-

signed int variable_name;
signed char variable_name;

Example:-

Both initialization are equal

int a = 5, b= -10;
signed int a = 5, b= -10;

we can use this type of modifier with both data type int and char.

 

unsigned

By using it with any data type, we store only positive values in a variable. char data type by default is unsigned type modifier.

SYNTEX:-

unsigned int variable_name;
unsigned char variable_name;

Example:-

unsigned int a = 5; // possible
unsigned int b = -10;// not possible, garbage value printed

 

long

SYNTEX:-

long int variable_name;
long int mobile;

Using this modifier you can increase the size of the variable. e.g. –

In generally, the size of an int data type is 2 byte but long type modifier is used with int then long int size will be 4 byte. long is used to store a large value.

It is used only with int data type.

 

short

This is the opposite of the long modifier. Using long type modifier with int data type decreases the int size of int.

SYNTEX:-

short int variable_name;

signed, unsigned and short, used with both data type int and char while long is used with double int.

Signed, unsigned can be used with short and long too

signed short int variable_name;
signed long variable_name;

 

Store a mobile number using long modifier

The long type modifier has been used with the int data type to store mobile no (which is 10 digit, can not do simple int store) in the given program-

#include<iostream.h>
#include<conio.h>

void main()
{
 long int m1=8989898989; // with modifier
 int m2 = 8989898989; //without modifier
 
  clrscr();
 cout<<"Mobile: "<<m1<<endl;
 cout<<"Mobile: "<<m2;
 getch();
}
OUTPUT:-
Mobile: 8989898989
Mobile: 723;



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