CODEWITHSUNDEEP
c++
fortnight learner
fortnight learner

Reputation: 21

How may inputs can i take in 1 line using Cin in C++?

like if a, b are variables then

cin>>a>>b;

like this how many variables can I take with 1 cin.

Upvotes: 0

Views: 430

Answers (2)

Tiger Yu
Tiger Yu

Reputation: 764

Actually, it is unlimited. But usually people use loops to input more data from cin, it is more controllable.

Upvotes: 0

463035818_is_not_an_ai
463035818_is_not_an_ai

Reputation: 122458

Fist some nitpicking on wording: There is only one std::cin. It is an object of type std::istream. It has an operator>> that lets you read one thing at a time. As the operator returns a reference to std::cin you can chain as many calls as you like.

Consider that those two are doing the same thing:

 std::cin >> a;
 std::cin.operator>>(a);

Chaining is achieved by

 std::cin >> a >> b;
 std::cin.operator>>(a).operator>>(b);

Because each call to operator>> returns a reference to the stream, there is no limit on how many variables you can read in one statement:

 int a,b,c,d,e,f;
 std::cin >> a >> b >> c >> d >> e >> f;

Though already with 2 variables you should consider if maybe they belong into the same data structure

 struct a_and_b {
     int a;
     int b;
 };

Then you can provide an overload for the operator>>

std::istream& operator>>(std::istream& in,a_and_b& x) {
       in >> x.a;
       in >> x.b;
       return in;
};

And then use the much more readable:

a_and_b x;
std::cin >> x;

Upvotes: 7

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