Chapter 3 - CS 225
True or False: If input failure occurs in a C++ program, the program terminates immediately and displays an error message.
False
True or False: In an output statement, each occurrence of endl advances the cursor to the end of the current line on an output device.
False
True or False: In the statement cin >> x;, x can be a variable or an expression.
False
True or False: It is a good idea to redefine cin and cout in your programs.
False
True or False: The extraction operator >> skips only all leading blanks when searching for the next data in the input stream.
False
True or 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 intvariables.) cin >> x; cin >> y;
False
True or False: Entering a char value into an int variable causes serious errors, called input failure.
True
True or False: The number of input data extracted by cin and >> depends on the number of variables appearing in the cin statement.
True
True or False: 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
True or False: You can use the function getline to read a string containing blanks.
True
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;
W
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;
X
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
a. 123456789012345678901234567890 ####Mickey Donald*****Goofy
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");
a. inFile.open("progdata.dat");
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**
b. 12345678901234567890 ***18**Happy**Sleepy
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);
'B'
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, 85.7800, 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, 356.88, 7623.97
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;
300
Suppose that doubles x = 462.191, y = 794.579, and z = 32.1238. What is the output of the following statements? cout << fixed << showpoint; cout << setprecision(1); cout << x << ' ' << y << ' ' << setprecision(3) << z << endl;
462.2, 794.6, 32.124
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");
b. outFile.open("outputData.out");
When you want to process only partial data, you can use the stream function ____ to discard a portion of the input.
ignore
Manipulators without parameters are part of the ____ header file.
iostream
In C++, the dot is an operator called the ____ operator.
member access
____ is a parameterized stream manipulator.
setfill
