CS 150 Chapter 3

It is a good idea to redefine cin and cout in your programs.

In the statement cin >> x;, x can be a variable or an expression.

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;

The number of input data extracted by cin and >> depends on the number of variables appearing in the cin statement.

The extraction operator >> skips only all leading blanks when searching for the next data in the input stream.

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.

Entering a char value into an int variable causes serious errors, called input failure.

If input failure occurs in a C++ program, the program terminates immediately and displays an error message.

In an output statement, each occurrence of endl advances the cursor to the end of the current line on an output device.

You can use the function getline to read a string containing blanks.

Suppose that x is an int variable and y is a double variable and the input is: 10 20.7 Choose the values after the following statement executes: cin >> x >> y;.

Suppose that x and y are int variables. Which of the following is a valid input statement?

Suppose that x is an int variable, y is a double variable and ch is a char variable and the input is: 15A 73.2 Choose the values after the following statement executes: Suppose that x is an int variable, y is a double variable and ch is a char variable and the input is: 15A 73.2 Choose the values after the following statement executes: cin >> x >> ch >> y;

Suppose that alpha is an int variable and ch is a char variable and the input is: 17 A What are the values after the following statements execute? cin >> alpha; cin >> ch;

Suppose that x is an int variable, y is a double variable, z is an int variable, and the input is: 15 76.3 14 Choose the values after the following statement executes: cin >> x >> y >> z;

Suppose that ch1, ch2, and ch3 are variables of the type char and the input is: A B C Choose the value of ch3 after the following statement executes: cin >> ch1 >> ch2 >> ch3;

Suppose that x and y are int variables, z is a double variable, and the input is: 28 32.6 12 Choose the values of x, y, and z after the following statement executes: cin >> x >> y >> z;

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;

Suppose that x and y are int variables, ch is a char variable, and the input is: 4 2 A 12 Choose the values of x, y, and ch after the following statement executes: cin >> x >> ch >> y;

Suppose that ch1 and ch2 are char variables, alpha is an int variable, and the input is: A 18 What are the values after the following statement executes? cin.get(ch1); cin.get(ch2); cin >> alpha;

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);

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

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;

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;

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;

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

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;

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 = 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;

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

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;

____ is a parameterized stream manipulator.

Manipulators without parameters are part of the ____ header file.

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?

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?

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

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

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

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

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

C++ has a special name for the data types istream and ostream. They are called ____________________.

cin is called a(n) ____________________ object.

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

To use the manipulator setprecision, the program must include the header file ____________________.

On some compilers, the statements cin >> fixed; and cin >> scientific; might not work. In this case, you can use the statement ____________________ in place of cin >> fixed;.

The manipulator ____________________ is used to output the value of an expression in a specific number of columns.

You can disable the manipulator left by using the stream function ____________________.

On some compilers, the statements cin >> left; and cin >> right; might not work. In this case, you can use the statement ____________________ in place of cin >> left;.

To use a parameterized stream manipulator in a program, you must include the header file ____________________.

C++ provides a header file called ____________________, which is used for file I/O.