Doubt regarding the user of cin to read white space characters

#1

For eg: if the code is :

cin>>ch;

while(ch != ‘.’)

{

     cout<<ch;

     cin>>ch;

}

And I give the input at console as " This is input"

What happens when input buffer sends white space to the program through cin ? Also if cin doesn’t send it to the program at all, does it simply discard that input ?

Also in case of an array, if we do:

int arr[50];

cin>>arr;

cout<<arr;

and try to give white space as input, the string is trimmed and nothing after the white space is read, why is that?:

INPUT: “This is Input”

OUTPUT: “This”

#2

cin treats space as delimiter.
so anything after space will be ignored (i.e cin will not read it).

if u want to read complete line then use getline function

#3

cin>>ch;
while(ch != ‘.’)
{
cout<<ch;
cin>>ch;
}

In this code, if my input is “Hello World!.” , the output will me “HelloWorld!”
If space is acting as a delimiter, why is it reading the input after space ?

#4

becuase of while loop .
it is keep of on reading again n again.

u have given hello world. as input.
so first cin will read only hello (because just after it u have space )

and then because we r in a loop .
cin will read again and this time ur last string word
and thats why u r getting such output

#5

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