C++ Chapter 5 Loop Test

__________ are C++ operators that change their operands by one.

++ and --

What is the output of the following code? #include <iostream> using namespace std; int main() { int n = 0; for (n = 1; n >= 10; n++) { cout << n << " "; } cout << n << " is done. "; }

1 is done

Type the exact output of the following code. X is declared as an int. x = 5; while (x >= 3) { x--; cout << x << " "; }

4 3 2

What will the following code print? num is declared as an int. num = 8; cout << --num << " "; cout << num++ << " "; cout << num;

7 7 8

The while loop has two important parts; a condition that is tested and a statement or block of statements that is executed

A. as long as the condition is true.

In order for a C++ program to read data from a file

All of the above are required

The -- operator

All of the above are true

The above code will display: int n, j; for (n = 1; n <= 20; n = n + 2) { for (j = 1; j <= 20 - n; j = j + 2) cout << " "; for (j = 1; j <= n; j++) cout << "G"; cout << endl; }

An isosceles triangle of G's with the longest side on the bottom

To use the files in a C++ program you must include the _______ header file.

C. fstream

The ++ operator

D. All of the above

The _______ statement causes a loop to terminate early.

D. break

To use an output file in a C++ program you must

E. do B and C but not A.

A while loop is somewhat limited because the counter can only be incremented or decremented by one each time through the loop

False

A while loop is somewhat limited, because the counter can only count up, not down

False

A while loop may have a semicolon after the test expression

False

In a do while loop, the {}'s are optional

False

To decrement a number means to increase its value

False

When a loop is nested inside another loop, the outer loop goes through all its iterations for each iteration of the inner loop.

False

You can nest a for loop inside another for loop, but cannot nest a while loop inside another while loop or a do-while loop inside another do-while loop. (T/F)

False

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

True

Assuming x has been declared, the following could be used as a valid for loop for (; x < 10; x++)

True

The >> operator returns true or false

True

The block of code in the body of a while statement can contain an unlimited number of statements provided they are enclosed in a set of braces

True

When a loop is nested inside another loop, the inner loop goes through all its iterations for each iteration of the outer loop.

True

A variable that keeps a running total of data values is called a(n)

accumlator

The statements in the body of a do while loop are executed

at least once

What function is used that allows the user to enter their own file name when reading or writing data?

c_str()

A(n) _____ is a variable that is regularly incremented or decremented each time a loop iterates

counter

The ideal type of loop to use for displaying a menu is a(n) ______ loop.

do-while

The ideal type of loop to use if you want a user to enter exactly 20 values is a(n) ______ loop.

for

To ________ a value means to increase it

increment

If nothing within a while loop ever causes the condition to become false, a(n) ________ may occur.

infinite loop

In a for loop statement, the ______ expression is executed only once.

initialization

A(n) _____ is a variable that controls the number of times a loop iterates

loop control variable

A sentinel is a special value that

marks the end of a list of values

The statements in the body of a while loop are executed

only if the test condition is initially true.

The do-while loop is a(n) ______ loop, whereas the For loop is a(n) ______ loop.

post test, pretest

A for loop is considered a(n) _______ loop.

pretest

The while loop is a(n) _____ loop, where as the do while loop is a(n) _____ loop

pretest, post test

The while loop has two important parts: a condition that is tested and a statement or block of statements that is

repeated as long as the condition is true

A(n) ______ is a special value that marks the end of a list of values

sentinel

If a while loop has no braces around the body of the loop

the loop body contains just one statement.

A for (loop) statement contains three expressions; initialization, test, and

update

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

variable

For data validation, it is best to use a(n)

while loop

Write the equivalent code to make the following more concise: while(ans == 'Y' || ans == 'y') where the condition only tests for a capital letter.

while(toupper(ans) == 'Y')