250+ TOP MCQs on Input Stream and Answers

This section on C++ Programming quiz on “Input Stream”. One shall practice these quizzes to improve their C++ programming skills needed for various interviews (campus interviews, walkin interviews, company interviews), placements, entrance exams and other competitive exams. These questions can be attempted by anyone focusing on learning C++ programming language. They can be a beginner, fresher, engineering graduate or an experienced IT professional. Our C++ quiz comes with detailed explanation of the answers which helps in better understanding of C++ concepts.

Here is a listing of C++ Programming quiz on “Input Stream” along with answers, explanations and/or solutions:

1. Which operator is used for input stream?
a) >
b) >>
c) <
d) <<
Answer: b
Clarification: The operator of extraction is >> and it is used on the standard input stream.

2. Where does a cin stops it extraction of data?
a) By seeing a blank space
b) By seeing (
c) By seeing a blank space & (
d) By seeing <
Answer: a
Clarification: cin will stop its extraction when it encounters a blank space.

3. Which is used to get the input during runtime?
a) cout
b) cin
c) coi
d) cinout
Answer: b
Clarification: cin is mainly used to get the input during the runtime.

4. What will be the output of the following C++ code?

```
    #include 
```
```
    using namespace std;
```
```
    int main ()
```
```
    {
```
```
        int i;
```

        cout << "Please enter an integer value: ";

```
        cin >> i + 4;
```
```
        return 0;
```
```
    }
```

a) 73
b) your value + 4
c) Error
d) 63
Answer: c
Clarification: We are not allowed to do addition operation on cin.

5. What will be the output of the following C++ code?

```
    #include 
```
```
    #include 
```
```
    #include 
```
```
    using namespace std;
```
```
    int main ()
```
```
    {
```
```
        string mystr;
```
```
        float price = 0;
```
```
        int quantity = 0;
```
```
        cout << "Enter price: ";
```
```
        getline (cin, mystr);
```
```
        stringstream(mystr) >> price;
```
```
        cout << "Enter quantity: ";
```
```
        getline (cin, mystr);
```

        stringstream(mystr) >> quantity;

        cout << "Total price: " << price * quantity << endl;

```
        return 0;
```
```
    }
```

a) 50
b) Depends on value you enter
c) Error
d) 100
Answer: b
Clarification: In this program, We are getting the input on runtime and manipulating the value.
Output:

$ g++ inp.cpp
$ a.out
Enter price: 3
Enter quantity: 4
Total price: 12

6. What will be the output of the following C++ code?

```
    #include 
```
```
    #include 
```
```
    #include 
```
```
    #include 
```
```
    using namespace std;
```
```
    template <typename CharT>
```

    void ignore_line ( basic_istream<CharT>& in )

```
    {
```

        in.ignore ( numeric_limits<streamsize> :: max(), in.widen ( 'n' ) );

```
    }
```
```
    int main()
```
```
    {
```
```
        cout << "First input: ";
```
```
        cin.get();
```
```
        cout << "Clearing cin.n";
```
```
        cin.clear();
```
```
        ignore_line ( cin );
```
```
        cout << "All done.n";
```
```
    }
```

a) First input
b) Clearing cin
c) Error
d) Second input
Answer: d
Clarification: In this program, We are getting the input and clearing all the values.
Output:

$ g++ inp1.cpp
$ a.out
First input: 4
Clearing cin.
All done.

a) 100
b) t
c) It will print what we enter till character t is encountered in the input data
d) 200
Answer: c
Clarification: The program will store all strings entered and will print them only when the character ‘t’ is encountered.

250+ TOP MCQs on Input Stream and Answers

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