Test 2

For file input/output in a program, the program must include the header file iofstream.

False

If the expression in an assert statement evaluates to true, the program terminates.

False

In C++, both ! and != are relational operators.

False

In a switch statement, every case must have a break.

False

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

False

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

False

Manipulators without parameters are part of the header file iomanip.

False

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

False

The function ignore is used specifically to skip only numbers in a line.

False

The symbol > is a logical operator.

False

The value of the expression 'a' < 'A' is true.

False

To use a parameterized manipulator, the program must include the header file iostream.

False

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

False

if (score = 50) grade = 'Z';

False

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

Ignore

The appearance of = in place of == resembles a(n) ____.

Silent Killer

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

True

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

True

cin is called an istream object.

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 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;

alpha = 17, ch = 'A'

int score; string grade; if (score >= 65) grade = "pass"; else grade = "fail"; If score is equal to 75, the value of grade is "pass" .

true

Suppose that x is an int variable, y is a double variable and ch is a char variable and the input is: 1 5A 73.2 Choose the values after the following statement executes: cin >> x >> ch >> y;

x = 15, ch = 'A', y = 73.2

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:

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 12 Choose the values of x, y, and z after the following statement executes: cin >> x >> y >> z;

x = 28, y = 32, z = 12.0

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;

x = 4, ch = 2, y = 12 ****** WRONG

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;.

x=10, y=20.7

A program uses repetition to implement a branch.

False

During program execution, when entering character data such as letters, you need to enter the single quotes around the character.

False

Which of the following operators has the highest precedence?

!

Which of the following is the "not equal to" relational operator?

!=

You can disable assert statements by using which of the following?

#define NDEBUG

For a program to use the assert function, it must include which of the following?

#include <cassert>

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;

'C'

What is the output of the following code? if (6 > 8) { cout << " ** " << endl ; cout << "****" << endl; } else if (9 == 4) cout << "***" << endl; else cout << "*" << endl;

*** *** WRONG

Which of the following expressions correctly determines that x is greater than 10 and less than 20?

10 < x && x < 20 ***

cout << "123456789012345678901234567890" << endl cout << setfill('#') << setw(10) << "Mickey" << setfill(' ') << setw(10) << "Donald" << setfill('*') << setw(10) << "Goofy" << endl;

123456789012345678901234567890 ####Mickey Donald*****Goofy

int num; int alpha = 10; cin >> num; switch (num) { case 3: alpha++; break; case 4: case 6: alpha = alpha + 3; case 8: alpha = alpha + 4; break; default: alpha = alpha + 5; } cout << alpha << endl;

13

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

Assume you have three int variables: x = 2, y = 6, and z. Choose the value of z in the following expression: z = (y / x > 0) ? x : y;.

2

int x = 55; int y = 5; switch (x % 7) { case 0: case 1: y++; case 2: case 3: y = y + 2; case 4: break; case 5: case 6: y = y - 3; } cout << y << endl;

2

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

int x = 35; int y = 45; int z; if (x > y) z = x + y; else z = y - x; cout << x << " " << y << " " << z << endl;

35 45 10

What is the value of x after the following statements execute? int x; x = (5 <= 3 && 'A' < 'F') ? 3 : 4

4

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 23.82

Which of the following is a relational operator?

==

The expression in an if statement is sometimes called a(n) ____.

Decision

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

True

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

True

In C++, the logical operator AND is &&.

True

On most systems, when the program terminates, the files are closed automatically.

True

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

True

The left operand of the extraction operator must be an input stream variable.

True

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

True

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

true

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

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;

ch1 = 'A', ch2 = ' ', alpha = 18

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

cin >> x >> y; ***

Every if statement must have a corresponding else.

false

If cin and the extraction operator reads two or more numbers from the input stream, the numbers must be separated by lines.

false

In C++, !, &&, and || are called relational operators.

false

Including a semicolon before the action statement in a one-way selection causes a syntax error.

false

The expression (x >= 0 && x <= 100) evaluates to false if either x < 0 or x >= 100.

false

The result of a logical expression cannot be assigned to an int variable, but it can be assigned to a bool variable.

false

n C++, all relational operators are evaluated before logical operators.

false

Which of the following will cause a logical error if you are attempting to compare x to 5?

if (x = 5)

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?

inFile.open("progdata.dat");

Manipulators without parameters are part of the ____ header file.

iostream

What does <= mean?

less than or equal to

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.open("outputData.out");

char lastInitial = 'A'; switch (lastInitial) { case 'A': cout << "section 1" <<endl; break; case 'B': cout << "section 2" <<endl; break; case 'C': cout << "section 3" <<endl; break; case 'D': cout << "section 4" <<endl; break; default: cout << "section 5" <<endl; }

section 1

char lastInitial = 'S'; switch (lastInitial) { case 'A': cout << "section 1" <<endl; break; case 'B': cout << "section 2" <<endl; break; case 'C': cout << "section 3" <<endl; break; case 'D': cout << "section 4" <<endl; break; default: cout << "section 5" <<endl; }

section 5

In a ____ control structure, the computer executes particular statements depending on some condition(s).

selection

____ is a parameterized stream manipulator.

setfill

The conditional operator ?: takes ____ arguments.

three

A compound statement functions as if it was a single statement.

true

A control structure alters the normal sequential flow of execution in a program.

true

Conditional statements help incorporate decision making into programs.

true

In C++, && has a higher precedence than ||.

true

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

true

Suppose P and Q are logical expressions. The logical expression P && Q is true if both P and Q are true.

true

Suppose found = true and num = 6. The value of the expression (!found) || (num > 6) is false.

true

The extraction operator >> is a binary operator.

true

The operators != and == have the same order of precedence.

true

The value of the expression 7 + 8 <= 15 is true.

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