Output Stream C++ MCQ

1. How many groups of output of operation are there in c++?
a) 1
b) 2
c) 3
d) 4


2. Picl out the correct objects about the instantiation of output stream.
a) cout
b) cerr
c) clog
d) All of the mentioned


3. What is meant by ofstream in c++?
a) Writes to a file
b) Reads from a file
c) Both a & b
d) None of the mentioned


4. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     int main () 

4.     {

5.         char str[] = "Steve jobs";

6.         int val = 65;

7.         char ch = 'A';

8.         cout.width (5);

9.         cout << right;

10.         cout << val << endl;

11.         return 0;

12.     }

a) Steve jobs
b) A
c) 65
d) 65


5. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     int main () 

4.     {

5.         int n; 

6.         n = 43;

7.         cout << hex << n << endl;

8.         return 0;

9.     }

a) 2c
b) 2b
c) 20
d) 50


6. What is the output of this program in the “test.txt” file?

1.     #include <fstream>

2.     using namespace std;

3.     int main ()

4.     {

5.         long pos;

6.         ofstream outfile;

7.         outfile.open ("test.txt");

8.         outfile.write ("This is an apple",16);

9.         pos = outfile.tellp();

10.         outfile.seekp (pos - 7);

11.         outfile.write (" sam", 4);

12.         outfile.close();

13.         return 0;

14.     }

a) This is an apple
b) apple
c) sample
d) This is a sample


7. What is the output of this program?

1.     #include <iostream>

2.     using namespace std;

3.     int main ()

4.     {

5.         int n;

6.         n = -77;

7.         cout.width(4); 

8.         cout << internal << n << endl;

9.         return 0;

10.     }

a) 77
b) -77
c) – 77
d) None of the mentioned


8. What is the output of this program?

1.     #include <iostream>

2.     #include <locale>

3.     using namespace std;

4.     int main()

5.     {

6.         locale mylocale("");

7.         cout.imbue( mylocale );

8.         cout << (double) 3.14159 << endl;

9.         return 0;

10.     }

a) 3.14
b) 3.14159
c) Error
d) None of the mentioned


9. How many types of output stream classes are there in c++?
a) 1
b) 2
c) 3
d) 4


10. What must be specified when we construct an object of class ostream?
a) stream
b) streambuf
c) memory
d) None of the mentioned