what in c++ std::cin>>somethin; take?

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äüöu

Joined: 21 Apr 2014
Posts: 1

äüöu 21 Apr 2014, 18:25

i have a qest for you:
find out what in c++
std::cin>>somethin;
take and why its a bit shift operator >>?

thanx y0u advice.

21 Apr 2014, 18:25

typedef

Joined: 25 Jul 2010
Posts: 2909
Location: 0x77760000

typedef 06 Oct 2014, 14:05

>> along with << are generally used for stream IO operations in C++ but they can also inherently be used for arithmetic operations.

06 Oct 2014, 14:05

AsmGuru62

Joined: 28 Jan 2004
Posts: 1543
Location: Toronto, Canada

AsmGuru62 06 Oct 2014, 14:39

I always found these (<< and >>) confusing.
I like how C# has a better solution.
C# has ToString() method at the very base of every class.
So, instead of ">>" the simple call "ToString()" can be used on any object.
Code is slightly longer on disk, but easier to read.

06 Oct 2014, 14:39

ManOfSteel

Joined: 02 Feb 2005
Posts: 1154

ManOfSteel 06 Oct 2014, 17:30

It's straightforward: << (AKA the insertion operator) and >> (AKA the extraction operator) show the direction taken by data, i.e. going to a stream or coming from a stream.

Code:

std::cout << "Hello World!";

writes the Hello World! string to the standard output (usually the screen).

Code:

std::cin >> inVar;

reads the contents of the standard input (usually the keyboard) into the inVar variable.

It all depends on the context. These operators become bitshift operators if the part on the left is an int or char variable.

06 Oct 2014, 17:30

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