Chapter 5

What executes immediately after a continue statement in a while and do-while loop?

loop-continue test

In ____ structures, the computer repeats particular statements a certain number of times depending on some condition(s).

looping

Which of the following statements generates a random number between 0 and 50?

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

Which executes first in a do...while loop?

the statement

What is the output of the following C++ code? num = 10; while (num > 10) num = num - 2; cout << num << endl;

10

What is the output of the following C++ code? int j; for (j = 10; j <= 10; j++) cout << j << " "; cout << j << endl;

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;

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;

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;

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;

25 1

What is the next Fibonacci number in the following sequence? 1, 1, 2, 3, 5, 8, 13, 21, ...

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);

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.

EOF-controlled

Assume that all variables are properly declared. The following for loop executes 20 times. for (i = 0; i <= 20; i++) cout << i; T/F

False

In a sentinel-controlled while loop, the body of the loop continues to execute until the EOF symbol is read. T/F

False

The following while loop terminates when j > 20. j = 0; while (j < 20) j++; T/F

False

The statement in the body of a while loop acts as a decision maker. T/F

False

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 << " "; } T/F

True

In a counter-controlled while loop, the loop control variable must be initialized before the loop. T/F

True

In the case of the sentinel-controlled while loop, the first item is read before the while loop is entered. T/F

True

The control statements in the for loop include the initial statement, loop condition, and update statement. T/F

True

The control variable in a flag-controlled while loop is a bool variable. T/F

True

The number of iterations of a counter-controlled loop is known in advance. T/F

True

The ____ statement can be used to eliminate the use of certain (flag) variables.

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.

counter-controlled

Which of the following is a repetition structure in C++?

do...while

____ loops are called posttest loops.

do...while

Which of the following loops is guaranteed to execute at least once?

do...while loop

A(n) ____-controlled while loop uses a bool variable to control the loop.

flag

When a continue statement is executed in a ____, the update statement always executes.

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;

i = 1;

A loop that continues to execute endlessly is called a(n) ____ loop.

infinite