Chapter 3 quiz
Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A BCWhat is the value of ch3 after the following statements execute?cin.get(ch1);cin.get(ch2);cin.get(ch3); 'A' 'C' '\n' 'B'
'B'
Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A BCChoose the value of ch3 after the following statement executes:cin >> ch1 >> ch2 >> ch3; 'A' 'B' '\n' 'C'
'C'
What is the output of the following statements? cout << setfill('*');cout << "12345678901234567890" << endl cout << setw(5) << "18" << setw(7) << "Happy"<< setw(8) << "Sleepy" << endl; 12345678901234567890 ***18 Happy Sleepy 12345678901234567890 ***18**Happy Sleepy 12345678901234567890 ***18**Happy**Sleepy 12345678901234567890 ***18**Happy Sleepy**
12345678901234567890 ***18**Happy**Sleepy
What is the output of the following statements? cout << "123456789012345678901234567890" << endlcout << setfill('#') << setw(10) << "Mickey"<< setfill(' ') << setw(10) << "Donald" << setfill('*') << setw(10) << "Goofy" << endl; 123456789012345678901234567890####Mickey####Donald*****Goofy 23456789012345678901234567890****Mickey####Donald#####Goofy 123456789012345678901234567890####Mickey####Donald#####Goofy 123456789012345678901234567890 ####Mickey Donald*****Goofy
123456789012345678901234567890 ####Mickey Donald*****Goofy
Suppose that x and y are int variables, ch is a char variable, and the input is:4 2 A 12Choose the values of x, y, and ch after the following statement executes:cin >> x >> ch >> y; x = 4, ch = ' ', y = 2 x = 4, ch = A, y = 12 x = 4, ch = 2, y = 12 This statement results in input failure
This statement results in input failure
Suppose that ch1 and ch2 are char variables and the input is: WXYZWhat is the value of ch2 after the following statements execute?cin.get(ch1);cin.putback(ch1);cin >> ch2; W X Z Y
W
The extraction operator >> skips only all leading blanks when searching for the next data in the input stream. False True
false
The following statements will result in input failure if the input values are not on a separate line. (Assume that x and y are int variables.) cin >> x;cin >> y; True False
false
C++ provides a header file called ____________________, which is used for file I/O.C++ provides a header file called ____________________, which is used for file I/O.
fstream
Entering a char value into an int variable causes serious errors, called input failure. True False
true
The number of input data extracted by cin and >> depends on the number of variables appearing in the cin statement. True False
true
When reading data into a char variable, after skipping any leading whitespace characters, the extraction operator >> finds and stores only the next character; reading stops after a single character. True False
true
You can use the function getline to read a string containing blanks. True False
true
Suppose that x is an int variable and y is a double variable and the input is:10 20.7Choose the values after the following statement executes: cin >> x >> y;. x = 10, y = 20.7 x = 10, y = 20 x = 10, y = 21.0 x = 10, y = 20.0
x = 10, y = 20.7
Suppose that x is an int variable, y is a double variable and ch is a char variable and the input is:15A 73.2Choose the values after the following statement executes:cin >> x >> ch >> y; x = 15, ch = 'A', y = 73.0 This statement results in an error because there is no space between 15 and A. x = 15, ch = 'A', y = 73.2 x = 15, ch = 'a', y = 73.0
x = 15, ch = 'A', y = 73.2
If input failure occurs in a C++ program, the program terminates immediately and displays an error message. True False
false
In an output statement, each occurrence of endl advances the cursor to the end of the current line on an output device. True False
false
In the statement cin >> x;, x can be a variable or an expression. True False
false
It is a good idea to redefine cin and cout in your programs. True False
false
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; 1565.683 85.780 123.980 1565.683 85.7800 123.98 1565.680 85.8000 123.98 1565.683 85.8000 123.98
1565.683 85.7800 123.98
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; 25.67 356.876 7623.967 25.67 356.87 7623.96 25.67 356.87 7623.97 25.67 356.88 7623.97
25.67 356.88 7623.97
Suppose that alpha, beta, and gamma are int variables and the input is: 100 110 120200 210 220300 310 320What is the value of gamma after the following statements execute?cin >> alpha;cin.ignore(100, '\n');cin >> beta;cin.ignore(100,'\n');cin >> gamma; 100 320 200 300
300
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; 55.680 476.859 23.821 55.680 476.859 23.82 55.680 476.860 23.82 55.690 476.860 23.82
55.680 476.859 23.82
Suppose that ch1 and ch2 are char variables and the input is: WXYZWhat is the value of ch2 after the following statements execute?cin >> ch1;ch2 = cin.peek();cin >> ch2; W Y Z X
X
Suppose that alpha is an int variable and ch is a char variable and the input is: 17 AWhat are the values after the following statements execute?cin >> alpha;cin >> ch; alpha = 17, ch = 'a' alpha = 1, ch = 7 alpha = 17, ch = ' ' alpha = 17, ch = 'A'
alpha = 17, ch = 'A'
Suppose that x is an int variable, ch is a char variable, and the input is:276.Choose the values after the following statement executes:cin >> ch >> x; ch = '2', x = 76 ch = 'b', x = 76 ch = '276', x = '.' ch = ' ', x = 276
ch = '2', x = 76
Suppose that ch1 and ch2 are char variables, alpha is an int variable, and the input is: A 18What are the values after the following statement executes?cin.get(ch1);cin.get(ch2);cin >> alpha; ch1 = 'A', ch2 = '\n', alpha = 1 ch1 = 'A', ch2 = ' ', alpha = 18 ch1 = 'A', ch2 = ' ', alpha = 1 ch1 = 'A', ch2 = '1', alpha = 8
ch1 = 'A', ch2 = ' ', alpha = 18
Suppose that x and y are int variables. Which of the following is a valid input statement? cout << x << y; cin << x << y; cin >> x >> y; cin >> x >> cin >> y;
cin >> x >> y;
C++ has a special name for the data types istream and ostream. They are called ____________________.
classes
When you want to process only partial data, you can use the stream function ____ to discard a portion of the input. delete clear skip ignore
ignore
Consider the following program segment. ifstream inFile; //Line 1int 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? open.inFile("progdata.dat"); inFile.open("progdata.dat"); inFile(open,"progdata.dat"); open(inFile,"progdata.dat");
inFile.open("progdata.dat");
Manipulators without parameters are part of the ____ header file. ifstream iostream iomanip pmanip
iostream
In C++, the dot is an operator called the ____ operator. member dot access member access data access
member access
In C++, the dot is an operator called the ____________________operator.
member access
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? outFile("outputData.out"); open(outFile,"outputData.out"); outFile.open("outputData.out"); open.outFile("outputData.out");
outFile.open("outputData.out");
The function ____________________ returns the next character in the input stream; it does not remove the character from the input stream.
peek
C++ comes with a wealth of functions, called ____________________ functions, that are written by other programmers.
pre-defined
____ is a parameterized stream manipulator. fixed endl scientific setfill
setfill
Suppose that x is an int variable, y is a double variable, z is an int variable, and the input is:15 76.3 14Choose the values after the following statement executes:cin >> x >> y >> z; x = 15, y = 76, z = 0 x = 15, y = 76.3, z = 14 x = 15, y = 76, z = 14 x = 15.0, y = 76.3, z = 14.0
x = 15, y = 76.3, z = 14
Suppose that x and y are int variables, z is a double variable, and the input is:28 32.6 12Choose the values of x, y, and z after the following statement executes:cin >> x >> y >> z; x = 28, y = 32, z = 12.0 x = 28, y = 32, z = 0.6 x = 28, y = 12, z = 32.6 x = 28, y = 12, z = 0.6
x = 28, y = 32, z = 0.6
