C++ CHA5

The function eof is a member of the data type ____________________

istream

What executes immediately after a continue statement in a while and do-while loop? a. loop-continue test b. update statement c. loop condition d. the body of the loop

loop-continue test

. In ____ structures, the computer repeats particular statements a certain number of times depending on some condition(s). a. looping b. branching c. selection d. sequence

looping

In a while and for loop, the loop condition is evaluated before executing the body of the loop. Therefore, while and for loops are called ____________________ loops.`

pretest

A semicolon at the end of the for statement (just before the body of the loop) is a(n) ____________________ error.

semantic

Which of the following statements generates a random number between 0 and 50? a. srand(time(0));num = rand() % 50; b. srand(time(10));num = rand()/50; c. srand(time(0));num = rand()50; d. srand(time(10));num = rand() % 50;

srand(time(0));num = rand() % 50;

Which executes first in a do...while loop? a. the statement b. loop condition c. the expression d. update statement

the statement

Assume all variables are properly declared. The output of the following C++ code is 2 3 4 5. n = 1;while (n < 5){ n++; cout << n << " ";} a. True b. False

true

In a counter-controlled while loop, the loop control variable must be initialized before the loop. a. True b. False

true

In the case of the sentinel-controlled while loop, the first item is read before the while loop is entered. a. True b. False

true

The control statements in the for loop include the initial statement, loop condition, and update statement. a. True b. False

true

The control variable in a flag-controlled while loop is a bool variable. a. True b. False

true

The number of iterations of a counter-controlled loop is known in advance. a. True b. False

true

What is the output of the following C++ code?num = 10;while (num > 10) num = num - 2;cout << num << endl; a. 0 b. 6 c. 8 d. 10

10

. What is the output of the following C++ code? int j;for (j = 10; j <= 10; j++) cout << j << " ";cout << j << endl; a. 10 b. 10 10 c. 10 11 d. 11 11

10 11

Suppose sum and num are int variables, and the input is 18 25 61 6 -1. What is the output of the following code?sum = 0;cin >> num;while (num != -1){ sum = sum + num; cin >> num;}cout << sum << endl; a. 92 b. 109 c. 110 d. 119

110

Suppose j, sum, and num are int variables, and the input is 26 34 61 4 -1. What is the output of the code?sum = 0;cin >> num;for (int j = 1; j <= 4; j++){ sum = sum + num; cin >> num;}cout << sum << endl; a. 124 b. 125 c. 126 d. 127

125

. Suppose sum, num, and j are int variables, and the input is 4 7 12 9 -1. What is the output of the following code?cin >> sum;cin >> num;for (j = 1; j <= 3; j++){ cin >> num; sum = sum + num;}cout << sum << endl; a. 24 b. 25 c. 41 d. 42

24

What is the output of the following C++ code?count = 1;num = 25;while (count < 25){ num = num - 1; count++;}cout << count << " " << num << endl; a. 24 0 b. 24 1 c. 25 0 d. 25 1

25 1

What is the next Fibonacci number in the following sequence?1, 1, 2, 3, 5, 8, 13, 21, ... a. 34 b. 43 c. 56 d. 273

34

What is the value of x after the following statements execute?int x = 5;int y = 30;do x = x * 2;while (x < y); a. 5 b. 10 c. 20 d. 40

40

Consider the following code. (Assume that all variables are properly declared.)cin >> ch;while (cin){ cout << ch; cin >> ch;}This code is an example of a(n) ____ while loop. a. sentinel-controlled b. flag-controlled c. EOF-controlled d. counter-controlled

EOF-controlled

What is the output of the following loop?count = 5;cout << 'St';do{ cout << 'o'; count--;} while (count <= 5); a. St b. Sto c. Stop d. This is an infinite loop.

This is an infinite loop.

The ____ statement can be used to eliminate the use of certain (flag) variables. a. while b. switch c. break d. if

break

The ____________________ statement is typically used for two purposes:• To exit early from a loop.• To skip the remainder of a switch structure.

break

Consider the following code. int limit;int reps = 0;cin >> limit;while (reps < limit){ cin >> entry; triple = entry * 3; cout << triple; reps++; }cout << endl;This code is an example of a(n) ____ while loop. a. flag-controlled b. counter-controlled c. EOF-controlled d. sentinel-controlled

counter-controlled

. A(n) ____-controlled while loop uses a bool variable to control the loop. a. counter b. sentinel c. flag d. EOF

flag

To generate a random number, you can use the function rand of the header file ____________________.

cstdlib

. ____ loops are called posttest loops. a. break b. for c. while d. do...while

do...while

Which of the following loops does not have an entry condition? a. EOF-controlled while loop b. sentinel-controlled while loop c. do...while loop d. for loop

do...while loop

Which of the following loops is guaranteed to execute at least once? a. counter-controlled while loop b. for loop c. do...while loop d. sentinel-controlled while loop

do...while loop

Which of the following is a repetition structure in C++? a. if b. switch c. while...do d. do...while`

do...while`

Assume that all variables are properly declared. The following for loop executes 20 times.for (i = 0; i <= 20; i++) cout << i; a. True b. False

false

In a sentinel-controlled while loop, the body of the loop continues to execute until the EOF symbol is read. a. True b. False

false

The following while loop terminates when j > 20. j = 0;while (j < 20) j++; a. True b. False

false

The statement in the body of a while loop acts as a decision maker. a. True b. False

false

When a continue statement is executed in a ____, the update statement always executes. a. while loop b. for loop c. switch structure d. do...while loop

for loop

What is the initial statement in the following for loop? (Assume that all variables are properly declared.)int i;for (i = 1; i < 20; i++) cout << "Hello World";cout << "!" << endl; a. i = 1; b. i < 20; c. i++; d. cout << "Hello World";

i = 1;

A loop that continues to execute endlessly is called a(n) ____ loop. a. end b. unhinged c. infinite d. definite

infinite

A loop ____________________ is a set of statements that remains true each time the loop body is executed.

invariant