Flashcard on Accumulators and Sentinel Values

Front

A(n) _____ value is a special value that cannot be mistaken as a member of the list, and signals that there are no more values to be entered. When the user enters the sentinel value, the loop terminates.

Back

sentinel

Front

The logic for calculating a sum of numbers generally requires the accumulator variable to be set to _____ otherwise the total may not be correct when the loop finishes.

Back

0

Front

A sentinel value is always included (summed) in the running total of an app that accumulates.

Back

False

Front

The best choice for a sentinel used in a program that sums the number of free throws made in an NBA playoff basketball game is 3 (assume Shaq is not playing).

Back

False

Front

-1 is not an ideal choice for a sentinel used to sum the number of days it is hot in the Sahara desert.

Back

False

Front

In the following program segment, which variable is the "loop control variable" (also known as the counter variable)? int a, r = 0, g = 0; while (r < 21) { g = r * 2; a += g; r++; } System.out.println("The sum is " + g);

Back

r

Front

In the following program segment, which is a VALID Java accumulator? int a, r, h = 1; g = 0; while (r < 21) { a = r * 2; g += a + h; r--; } System.out.println("The sum is " + g);

Back

g