Android™ How to Program, Second Edition

Summarizing the Results

The for statement (lines 15–27) reads the responses from the array responses one at a time and increments one of the counters frequency[1] to frequency[5]; we ignore frequency[0] because the survey responses are limited to the range 1–5. The key statement in the loop appears in line 19. This statement increments the appropriate frequency counter as determined by the value of responses[answer].

Let’s step through the first few iterations of the for statement:

• When the counter answer is 0, responses[answer] is the value of responses[0] (that is, 1—see line 9). In this case, frequency[responses[answer]] is interpreted as frequency[1], and the counter frequency[1] is incremented by one. To evaluate the expression, we begin ...