The example program in the video has three possible outcomes depending on the following levels of radiation exposure:
.       Less than 0.5 sieverts
.       Greater than or equal to 0.5 but less than 4 sieverts
.       Greater than or equal 4 sieverts

Which statement is used to capture an exposure value greater than or equal to 0.5 but less than 4 sieverts?

Question

The example program in the video has three possible outcomes depending on the following levels of radiation exposure:
.       Less than 0.5 sieverts
.       Greater than or equal to 0.5 but less than 4 sieverts
.       Greater than or equal 4 sieverts
 
Which statement is used to capture an exposure value greater than or equal to 0.5 but less than 4 sieverts?

BlackTom AI · Accepted Answer

First, restating the problem helps orient the reasoning: we have three exposure ranges and need the control flow statement that handles the middle range (>= 0.5 and < 4 sieverts). Option 1: 'Else statement' – An else block runs when previous conditions are false. It cannot independently check a specific range like >= 0.5 and < 4; it only provides a catch-all default. This makes it inappropriate for selectively handling the middle exposure level. Option 2: 'Else if statement' – An else if (or else if) allows a subsequent condition to be tested only if earlier conditions failed. This is exactly how you would capture the middle range: you test the first condition (e.g., less than 0.5), and if that's false, you test whether exposure is >= 0.5 and < 4. The structure enables precise range checking and prevents overlapping logic. Option 3: 'Nested if statement' – A nested if could technically express the same logic, but it adds an extra level of depth and complexity without necessity for this simple middle-range check. It’s not the typical or most straightforward approach to capture the middle range, though it could achieve the result in a more verbose way. Option 4: 'If statement' – A single if statement can test a condition, but without a subsequent else or else if, you cannot elegantly handle the alternative ranges. It would require additional separate ifs to cover the other ranges, which is less efficient and harder to read. In summary, the middle range requires a conditional that activates only when the first condition fails, and that behavior is provided by an else if statement rather than a plain if, a simple else, or a more complex nested structure. The else statement by itself cannot discriminate the middle range, and the plain if does not account for prior outcomes. Nested if could work but is unnecessary for this scenario, and would complicate the logic rather than streamline it.

CSE-110-OD25-27 6.1 Lessons and Knowledge Check - Study Hall Video episodes: 9-13

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