# COSC TEST Practice Chapter5

Total word count: 1176
Pages: 4

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 A(n) ____-controlled while loop uses a bool variable to control the loop. Flag A do…while loop is a post-test loop. true What is the output of the following C++ code? num = 10; while (num > 10) num = num – 2; cout << num << endl; 10 The statement in the body of a while loop acts as a decision maker. False The function eof returns true if the program has read past the end of the input file True What is the next Fibonacci number in the following sequence? 1, 1, 2, 3, 5, 8, 13, 21, … 34 The ____ statement can be used to eliminate the use of certain bool variables in a loop. Break A break statement is legal in a while loop, but not in a for loop. False The body of a do…while loop may not execute at all. False The do…while loop has an exit condition but no entry condition. True Consider the following code. int limit; int counter = 0; cin >> limit; while (counter < limit) { cin >> entry; triple = entry * 3; cout << triple; counter++; } cout << endl; This code is an example of a(n) ____ while loop. Counter Controlled In ____ structures, the computer repeats particular statements a certain number of times depending on some condition(s). Looping It is possible that the body of a while loop may not execute at all, but the body of a for loop executes at least once. False Which of the following loops is guaranteed to execute at least once? do while loop 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. … ____ loops are called post-test loops. do – while The control statements in the for loop include the initial statement, loop condition, and update statement. True 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 A loop that continues to execute endlessly is called a(n) ____ loop. Infinite In a sentinel-controlled while loop, the body of the loop continues to execute until the EOF symbol is read. False In a sentinel-controlled while loop, the body of the loop continues to execute until the EOF symbol is read. False *Which executes first in a do…while loop? *The statement Loop control variables are automatically initialized in a loop. False Both while and for loops are pre-test loops. True When a continue statement is executed in a ____, the update statement always executes. For loop In a counter-controlled while loop, the loop control variable must be initialized before the loop. True Which of the following is a repetition structure in C++? do while 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 The number of iterations of a counter-controlled loop is known in advance. True The execution of a break statement in a while loop terminates the loop. True A sentinel-controlled while loop is an event-controlled while loop whose termination depends on a special value. True The fourth number in a Fibonacci sequence is found by taking the sum of the previous two numbers in the sequence. True After a break statement executes, the program continues to execute with the first statement after the structure. True If a continue statement is placed in a do…while structure, the loop-continue test is evaluated immediately after the continue statement. True A for loop is typically called an indexed for loop. True 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; 2.24 1.25 Assume all variables are properly declared. What is the output of the following C++ code? num = 100; while (num <= 150) num = num + 5; cout << num << endl; 155 What is the output of the following loop? count = 5; cout << ‘St’; do { cout << ‘o’; count–; } while (count <= 5); This is an infinite loop. Which of the following loops does not have an entry condition? A Do While Loop The control variable in a flag-controlled while loop is a bool variable. True What is the output of the following C++ code? int j; for (j = 10; j <= 10; j++) cout << j << " "; cout << j << endl; 11 11 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 Which of the following is true about a do…while loop? … Assume all variables are properly declared. The following for loop executes 20 times. for (i = 0; i <= 20; i++) cout << i; false An infinite loop may execute indefinitely. True In the for statement, if the loop condition is omitted, it is assumed to be false. False In the case of the sentinel-controlled while loop, the first item is read before the while loop is entered. True A syntax error will result if the control statements of a for loop are omitted. False An EOF-controlled while loop is another name for a sentinel-controlled while loop. 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 << " "; } True What executes immediately after a continue statement in a while and do-while loop? Loop Continue Test A loop is a control structure that allows you to repeat a set of statements until certain conditions are met. True Which of the following 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; … The following while loop terminates when j > 20. j = 0; while (j < 20) False

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