Question

Which of the following is the best option for the function prototype of the overloaded extraction operator.

Group of answer choices

friend istream& operator >>(const istream& ins, const Pairs& second);

istream& operator >>(istream& ins, Pairs& second);

friend istream& operator >>(istream& ins, Pairs& second);

friend istream& operator >>(const istream& ins, Pairs& second);

friend istream& operator >>(istream& ins, const Pairs& second);

Programming language: C++

Requirement: this is multiple choices.

Answer 1

Syntax of the overloaded extraction operator is
friend istream & operator >> (istream &in,  type &c)

So,
the best option for the function prototype of the overloaded extraction operator is
friend istream& operator >>(istream& ins, Pairs& second);

friend istream& operator >>(istream& ins, Pairs& second);