Question 1

In C++, the dot is an operator called the ____ operator.
A) dot access
B) member access
C) data access
D) member

Accepted Answer

The dot operator is used for accessing members of a class or struct in C++. Therefore, it is called the member access operator. Options A, C, and D are incorrect or redundant.

Question 2

The functions get, ignore, and so on are members of the data type ____________________.

Accepted Answer

The answer of The functions get, ignore, and so on...

Question 3

Suppose that outFile is an ofstream variable and output is to be stored in the file outputData.out. Which of the following statements opens the file outputData.out and associates outFile to the output file?
A) outFile("outputData.out");
B) outFile.open("outputData.out");
C) open(outFile,"outputData.out");
D) open.outFile("outputData.out");

Accepted Answer

The correct statement to open the file and associate outFile to the output file is outFile.open("outputData.out"). Option A is incorrect because it is not a valid way to associate an ofstream variable with a file. Option C is incorrect because open() is not a member function of the standard io library. Option D is incorrect because there is no function called open.outFile(). Therefore, the best choice is B.

Question 4

Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A B
C
What is the value of ch3 after the following statements execute?
cin.get(ch1);
cin.get(ch2);
cin.get(ch3);
A) 'A'
B) 'B'
C) 'C'
D) '
'

Accepted Answer

The answer of Suppose that ch1, ch2, and ch3 are...

Question 5

What is the output of the following statements? cout << setfill('*');
Cout << "12345678901234567890" << endl
Cout << setw(5) << "18" << setw(7) << "Happy"
<< setw(8) << "Sleepy" << endl;
A) 12345678901234567890
***18 Happy Sleepy
B) 12345678901234567890
***18**Happy**Sleepy
C) 12345678901234567890
***18**Happy Sleepy
D) 12345678901234567890
***18**Happy Sleepy**

Accepted Answer

The statement "cout << setfill('*');" sets the fill character for subsequent output to '*'. The first statement outputs the string "12345678901234567890" as is. The second statement uses setw() to set the width of the output field for each string that follows. The first string "18" is given a width of 5, so it is padded on the left with two asterisks. The second string "Happy" is given a width of 7, so it is padded on the left with two asterisks and on the right with two asterisks. The third string "Sleepy" is given a width of 8, so it is padded on the left with two asterisks and on the right with three asterisks. The final output is "***18**Happy**Sleepy".

Question 6

In the C++ statement,
cin.get(u);
u must be a variable of type ____________________.

Accepted Answer

The answer of In the C++ statement,
cin.get(u);
u must be a...

Question 7

Suppose that ch1 and ch2 are char variables and the input is: WXYZ
What is the value of ch2 after the following statements execute?
Cin.get(ch1);
Cin.putback(ch1);
Cin >> ch2;
A) W
B) X
C) Y
D) Z

Accepted Answer

The `get(ch1)` reads the first character 'W' into `ch1`. Then, `putback(ch1)` puts 'W' back into the stream. Finally, `cin >> ch2` reads the next available character, which is 'W' again, into `ch2`.

Question 8

____ is a parameterized stream manipulator.
A) endl
B) fixed
C) scientific
D) setfill

Accepted Answer

setfill is the only parameterized stream manipulator. endl, fixed, and scientific are all stream manipulators but do not require any parameters.

Question 9

What is the output of the following statements? cout << "123456789012345678901234567890" << endl
Cout << setfill('#') << setw(10) << "Mickey"
<< setfill(' ') << setw(10) << "Donald"
<< setfill('*') << setw(10) << "Goofy" << endl;
A) 123456789012345678901234567890
####Mickey Donald*****Goofy
B) 123456789012345678901234567890
####Mickey####Donald*****Goofy
C) 123456789012345678901234567890
####Mickey####Donald#####Goofy
D) 23456789012345678901234567890
****Mickey####Donald#####Goofy

Accepted Answer

The answer of What is the output of the following...

Question 10

C++ comes with a wealth of functions, called ____________________ functions, that are written by other programmers.

Accepted Answer

The answer of C++ comes with a wealth of functions,...

Question 11

Manipulators without parameters are part of the ____ header file.
A) iostream
B) iomanip
C) ifstream
D) pmanip

Accepted Answer

Manipulators without parameters, such as endl and flush, are part of the iostream header file.

Question 12

Suppose that ch1 and ch2 are char variables and the input is: WXYZ
What is the value of ch2 after the following statements execute?
Cin >> ch1;
Ch2 = cin.peek();
Cin >> ch2;
A) W
B) X
C) Y
D) Z

Accepted Answer

The first statement cin >> ch1 reads the first character 'W' from the input stream and stores it in ch1.
The second statement ch2 = cin.peek() peeks at the next character in the input stream, which is 'X', and assigns it to ch2.
The third statement cin >> ch2 reads the next character 'X' from the input stream and stores it in ch2.
Therefore, the value of ch2 after the statements execute is 'X'.

Question 13

Suppose that alpha, beta, and gamma are int variables and the input is: 100 110 120
200 210 220
300 310 320
What is the value of gamma after the following statements execute?
Cin >> alpha;
Cin.ignore(100, '
');
Cin >> beta;
Cin.ignore(100,'
');
Cin >> gamma;
A) 100
B) 200
C) 300
D) 320

Accepted Answer

After executing the first two statements, alpha will have the value of 100 and beta will have the value of 110. The third statement will read in the next integer, which is 120, into gamma. Therefore, the value of gamma will be 120.

Question 14

Consider the following program segment. ifstream inFile; //Line 1
Int x, y; //Line 2
).. //Line 3
InFile >> x >> y; //Line 4
Which of the following statements at Line 3 can be used to open the file progdata.dat and input data from this file into x and y at Line 4?
A) inFile.open("progdata.dat");
B) inFile(open,"progdata.dat");
C) open.inFile("progdata.dat");
D) open(inFile,"progdata.dat");

Accepted Answer

The correct syntax for opening a file using ifstream is as follows: ifstream_Name.open("file_name"). Therefore, option A is the correct choice as it follows the correct syntax and opens the file "progdata.dat". Option B and D have syntax errors and option C is an invalid statement.

Question 15

When you want to process only partial data, you can use the stream function ____ to discard a portion of the input.
A) clear
B) skip
C) delete
D) ignore

Accepted Answer

The answer of When you want to process only partial...

Question 16

The stream function ____________________ lets you put the last character extracted from the input stream by the get function back into the input stream.

Accepted Answer

The answer of The stream function ____________________ lets you put...

Question 17

Suppose that x = 1565.683, y = 85.78, and z = 123.982. What is the output of the following statements? cout << fixed << showpoint;
Cout << setprecision(3) << x << ' ';
Cout << setprecision(4) << y << ' ' << setprecision(2) << z << endl;
A) 1565.683 85.8000 123.98
B) 1565.680 85.8000 123.98
C) 1565.683 85.7800 123.98
D) 1565.683 85.780 123.980

Accepted Answer

The first cout statement sets the output to fixed-point notation and includes trailing zeros. 
The second cout statement prints x with 3 decimal places, y with 4 decimal places, and z with 2 decimal places. 
Therefore, the output will be: 1565.683 (x with 3 decimal places) 85.7800 (y with 4 decimal places) 123.98 (z with 2 decimal places). 
Choice C is the only option that matches this output.

Question 18

Suppose that x = 55.68, y = 476.859, and z = 23.8216. What is the output of the following statements? cout << fixed << showpoint;
Cout << setprecision(3);
Cout << x << ' ' << y << ' ' << setprecision(2) << z << endl;
A) 55.680 476.859 23.82
B) 55.690 476.860 23.82.
C) 55.680 476.860 23.82,
D) 55.680 476.859 23.821

Accepted Answer

The answer of Suppose that x = 55.68, y =...

Question 19

Suppose that x = 25.67, y = 356.876, and z = 7623.9674. What is the output of the following statements? cout << fixed << showpoint;
Cout << setprecision(2);
Cout << x << ' ' << y << ' ' << z << endl;
A) 25.67 356.87 7623.96
B) 25.67 356.87 7623.97
C) 25.67 356.88 7623.97
D) 25.67 356.876 7623.967

Accepted Answer

The answer of Suppose that x = 25.67, y =...

Question 20

The function ____________________ returns the next character in the input stream; it does not remove the character from the input stream.

Accepted Answer

The answer of The function ____________________ returns the next character...

Quiz 3: Inputoutput

In C++, the dot is an operator called the ____ operator.

The functions get, ignore, and so on are members of the data type ____________________.

Suppose that outFile is an ofstream variable and output is to be stored in the file outputData.out. Which of the following statements opens the file outputData.out and associates outFile to the output file?

Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A B C What is the value of ch3 after the following statements execute? cin.get(ch1) ; cin.get(ch2) ; cin.get(ch3) ;

What is the output of the following statements? cout << setfill('*') ; Cout << "12345678901234567890" << endl Cout << setw(5) << "18" << setw(7) << "Happy" << setw(8) << "Sleepy" << endl;

In the C++ statement, cin.get(u); u must be a variable of type ____________________.

Suppose that ch1 and ch2 are char variables and the input is: WXYZ What is the value of ch2 after the following statements execute? Cin.get(ch1) ; Cin.putback(ch1) ; Cin >> ch2;

____ is a parameterized stream manipulator.

What is the output of the following statements? cout << "123456789012345678901234567890" << endl Cout << setfill('#') << setw(10) << "Mickey" << setfill(' ') << setw(10) << "Donald" << setfill('*') << setw(10) << "Goofy" << endl;

C++ comes with a wealth of functions, called ____________________ functions, that are written by other programmers.

Manipulators without parameters are part of the ____ header file.

Suppose that ch1 and ch2 are char variables and the input is: WXYZ What is the value of ch2 after the following statements execute? Cin >> ch1; Ch2 = cin.peek() ; Cin >> ch2;

Suppose that alpha, beta, and gamma are int variables and the input is: 100 110 120 200 210 220 300 310 320 What is the value of gamma after the following statements execute? Cin >> alpha; Cin.ignore(100, '\n') ; Cin >> beta; Cin.ignore(100,'\n') ; Cin >> gamma;

Consider the following program segment. ifstream inFile; //Line 1 Int x, y; //Line 2 ) .. //Line 3 InFile >> x >> y; //Line 4 Which of the following statements at Line 3 can be used to open the file progdata.dat and input data from this file into x and y at Line 4?

When you want to process only partial data, you can use the stream function ____ to discard a portion of the input.

The stream function ____________________ lets you put the last character extracted from the input stream by the get function back into the input stream.

Suppose that x = 1565.683, y = 85.78, and z = 123.982. What is the output of the following statements? cout << fixed << showpoint; Cout << setprecision(3) << x << ' '; Cout << setprecision(4) << y << ' ' << setprecision(2) << z << endl;

Suppose that x = 55.68, y = 476.859, and z = 23.8216. What is the output of the following statements? cout << fixed << showpoint; Cout << setprecision(3) ; Cout << x << ' ' << y << ' ' << setprecision(2) << z << endl;

Suppose that x = 25.67, y = 356.876, and z = 7623.9674. What is the output of the following statements? cout << fixed << showpoint; Cout << setprecision(2) ; Cout << x << ' ' << y << ' ' << z << endl;

The function ____________________ returns the next character in the input stream; it does not remove the character from the input stream.