Stack #4119023

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Answer

An initialization expression may be omitted from the for loop if no initialization is required.

True

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The scope of a variable declared in a for loop's initialization expression always extends beyond the body of the loop.

False

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The condition that is tested by a while loop must be enclosed in parentheses and terminated with a semicolon.

False

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The update expression of a for loop can contain more than one statement, for example: for(i = 5; i <= 10; i++, total+= sales)

True

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Multiple relational expressions cannot be placed into the test condition of a for loop.

True

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In C++ 11 you can pass a string object as an argument to a file stream object's open member function.

True

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string objects have a member function named c_str that returns the contents of the object formatted as a null-terminated C-string.

True

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The two important parts of a while loop are the expression that is tested for a true or false value and

a statement or block that is repeated as long as the expression is true

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Something within a while loop must eventually cause the condition to become false or a(n) ________ results.

infinite loop

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The statements in the body of a while loop may never be executed while the statements in the body of a do-while loop will be executed

at least once

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A statement that may be used to stop a loop's current iteration and begin the next one is

continue

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A statement that causes a loop to terminate early is

break

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A special value that marks the end of a list of values is a

sentinel

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In the following statement, which operator is used first? while (x++ < 10)

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What will the following code display? Int number=6; cout<<number++<<endl;

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What will the following code display? int number = 6; cout << ++number << endl;

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In a for statement, this expression is executed only once:

initialization

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You may define a ________ in the initialization expression of a for loop.

variable

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The do-while loop is considered

a post-test loop

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The ________ loop is ideal in situations where you want the loop to iterate at least once.

do-while

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The ________ loop is a good choice when you know how many times you want the loop to iterate in advance of entering the loop.

for

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The ________ loop is a good choice when you do not want the loop to iterate if the condition is FALSE in the beginning.

while

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You should be careful when using the equality operator to compare floating point values because of potential round-off errors.

True

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The following code correctly determines whether x contains a value in the range of 0 through 100, inclusive. if (x > 0 && <= 100)

False

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What is assigned to the variable result given the statement below with the following assumptions: x = 10, y = 7, and x, result, and y are all int variables. result = x >= y;

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Which of the following expressions will determine whether x is less than or equal to y?

x <= y

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These operators connect two or more relational expressions into one, or reverse the logic of an expression.

logical

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Without this statement appearing in a switch construct, the program "falls through" all of the statements below the one with the matching case expression.

break

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The default section of a switch statement performs a similar task similar to the ________ portion of an if/else if statement.

trailing else

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When a program lets the user know that an invalid choice has been made, this is known as:

input validation

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The only difference between the get function and the >> operator is that get reads the first character typed, even if it is a space, tab, or the [Enter] key.

True

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The cin << statement will stop reading input when it encounters a newline character.

True

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When C++ is working with an operator, it strives to convert the operands to the same type.

True

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Question 4 1 / 1 pts The following statement will output $5.00 to the screen: cout << setprecision(5) << dollars << endl;

False

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In C++, it is impossible to display the number 34.789 in a field of 9 spaces with 2 decimal places of precision.

False

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The ________ causes a program to wait until information is typed at the keyboard and the [Enter] key is pressed.

cin object

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Which of the following must be included in any program that uses the cin object?

the header file iostream

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Which of the following will allow the user to input the values 15 and 20 and have them stored in variables named base and height, respectively?

cin >> base >> height;

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What will be displayed after the following statements execute? int num1 = 5; int num2 = 3; cout << "The result is " << (num1 * num2 + 10) << endl;

The result is 25

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What is the value of average after the following code executes? double average; average = 1.0 + 2.0 + 3.0 / 3.0;

4.0

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What is the value of cube after the following code executes? double cube, side; side = 5.0; cube = pow(side, 3.0);

125.0

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When the final value of an expression is assigned to a variable, it will be converted to

the data type of the variable

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When a variable is assigned a number that is too large for its data type, it

overflows

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Which statement is equivalent to the following? number += 1;

number = number + 1;

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This manipulator is used to establish a field width for the value that follows it:

setw

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You can control the number of significant digits in your output with the ________ manipulator.

setprecision

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What is TRUE about the following statement? cout << setw(4) << num4 << " ";

It allows four spaces for the value in num4.

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Which of the following statements will pause the screen until the [Enter] key is pressed?

cin.get();

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Which of the following statements will allow the user to enter three values to be stored in variables length, width, and height, in that order?

cin.get(length, width, height);

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Which of the following functions tells the cin object to skip one or more characters in the keyboard buffer?

cin.ignore

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________ reads a line of input, including leading and embedded spaces, and stores it in a string object.

getline

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How many characters will the following statement read into the variable myString? cin >> setw(10) >> myString;

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A debugging process where you, the programmer, pretend you are a computer and step through each statement while recording the value of each variable at each step is known as

hand tracing

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The preprocessor reads a program before it is compiled and only executes those lines beginning with # symbol.

True

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In programming, the terms "line" and "statement" always mean the same thing.

False

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In C++, key words are written in all lowercase letters.

True

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The preprocessor executes after the compiler.

False

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When typing your source code into the computer, you should be careful since most of your C++ instructions, header files, and variable names are case sensitive.

True

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In C++ you are required to name your variables so they indicate the purpose they will be used for.

False

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Floating point constants are normally stored in memory as doubles.

True

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C++ does not have a built-in data type for storing strings of data.

True

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A statement that starts with a hashtag (or pound) symbol (#) is called a

preprocessor directive

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In the following statement, the characters Hello! are a(n) cout << "Hello!";

string literal

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Which of the following must be included in any program that uses the cout object?

the header file iostream

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The ________ causes the content of another file to be inserted into a program.

#include directive

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Every complete C++ program must have a

function named main

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In a cout statement, which of the following will advance the output position to the beginning of the next line?

endl or \n

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A(n) ________ represents a storage location in the computer's memory.

variable

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Data items whose values do NOT change while the program is running are

literals

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A variable definition tells the computer

the variable's name and the type of data it will hold

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You must have a ________ for every variable you intend to use in a program.

variable definition

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Which of the following is NOT a valid C++ identifier?

1user

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What will the following code display? int x = 23, y = 34, z = 45; cout << x << y << z << endl;

233445

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The numeric data types in C++ can be broken into two general categories which are

integers and floating-point numbers

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A character literal is ________, whereas a string literal is ________

enclosed in single quotation marks, enclosed in double quotation marks

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The float data type is considered ________ precision and the double data type is considered ________ precision.

single, double

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Which of the following lines must be included in a program that has string variables?

#include <string>

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In memory, C++ automatically places a(n) ________ at the end of string literals which ________.

null terminator, marks the end of the string

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Select all that apply. Which of the following statements is(are) TRUE about named constants?

The content of a named constant is read-only. A named constant is defined using the const qualifier. The value of a named constant cannot be changed while the program is running.

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