Files and Streams Easy Questions and Answers

What is the output of this program?

#include <iostream>
    using namespace std;
    int main ()
    {
        char First_ch, Second_ch, Third_ch;
        cout << "Enter any word or number: ";
        First_ch = cin.get();
        cin.sync();
        Second_ch = cin.get();
        cin.sync();
        Third_ch = cin.get();
        cout << First_ch << endl;
        cout << Second_ch << endl;
        cout << Third_ch << endl;
        return 0;
    }

Correct Option: D

In this program, We are using the sync function to return the first three letters of the entered word.

What is the output of this program?

#include <iostream>
    #include <fstream>
    using namespace std;
    int main () 
    {
        ofstream outfile ("Sample.txt");
        for (int num = 0; num < 50; num++)
        {
            outfile << num;
            outfile.flush();
        }
        cout << "Done successfully";
        outfile.close();
        return 0;
    }

Correct Option: D

In this program, We are using the flush function to update the contents in a file.

What is the output of this program?

#include <iostream>
    using namespace std;
    int main ()
    {
        int num1 = 150;
        double num2 = 6.251;
        cout << num1;
        cout << " ";
        cout << num2 << " " << num1 * num2;
        endl (cout);
        return 0;
    }

Correct Option: A

In this program, We are printing the given value and manipulating the given value by using endl.

By seeing which operator thus this program stops getting the input?

#include <iostream>
    #include <fstream>
    using namespace std;
    int main ()
    {
        char ch;
        streambuf * pbuf;
        ofstream os ("Example.txt");
        pbuf = os.rdbuf();
        do {
            ch = cin.get();
            pbuf -> sputc(ch);
        } while (ch != '.');
        os.close();
        return 0;
    }

Correct Option: B

This program will stop getting the input, When it occurs the dot(.) operator.

Which member function is used to determine whether the stream object is currently associated with a file?

Correct Option: C

The member function is_open can be used to determine whether the stream object is currently associated with a file.