Given year is positive, which expressions for XXX, YYY, and ZZZ will output the correct range? Choices are in the form XXX / YYY / ZZZ.

If XXX: Output "1-100"
Else If YYY: Output "101-200"
Else If ZZZ: Output "201-300"
Else: Output "Other"

Question

Given year is positive, which expressions for XXX, YYY, and ZZZ will output the correct range? Choices are in the form XXX / YYY / ZZZ.

If XXX: Output "1-100"
Else If YYY: Output "101-200"
Else If ZZZ: Output "201-300"
Else: Output "Other"

BlackTom AI · Accepted Answer

Mapping numeric ranges requires comparison operators that include the correct endpoints. For positive years, the conditions must partition the number line into 1–100, 101–200, 201–300 without gaps or overlaps. 1. Relevant knowledge points and concepts - Comparison operators (<, >, <=, >=) determine inclusive/exclusive endpoints. - A series of If / Else If checks is evaluated sequentially; the first true condition is taken. - To capture 1–100 inclusive, use year < 101 (assuming year > 0 is known). For 101–200 inclusive, require year >= 101 and year < 201; in an Else If after year < 101 fails, year < 201 suffices because year is already >= 101. Same logic for 201–300 using year < 301. 2. Step-by-step reasoning - First branch should be true for year = 1 through year = 100. Condition year < 101 is true for 1..100 and false for 101. - If the first branch fails, we need the second to be true for 101..200. Condition year < 201 is true for 101..200 (and false for 201). - If both prior branches fail, the third should be true for 201..300. Condition year < 301 is true for 201..300. 3. Intermediate checks (sample values) - year = 100: year < 101 → true → outputs "1-100". - year = 101: year < 101 → false; year < 201 → true → outputs "101-200". - year = 200: first false; second true → "101-200". - year = 201: first false; second false; third year < 301 → true → "201-300". - year = 301: all three false → falls to Else → "Other". 4. Why the correct answer is correct Using year < 101 / year < 201 / year < 301 creates contiguous, non-overlapping inclusive ranges [1,100], [101,200], [201,300] in the sequential If / Else If structure, matching the required outputs. 5. Why other options are incorrect - year < 100 / year < 200 / year < 300: excludes 100, 200, 300 (off-by-one), so 100 would fall into the wrong category. - year > 0 / year > 100 / year > 200: first condition year > 0 is true for all positive years, so later branches never run. - year > 0 / year > 99 / year > 199: similarly, year > 0 always true, so every positive year yields "1-100" incorrectly. 6. Conclusion Therefore the correct expressions are: year < 101 / year < 201 / year < 301, which matches the provided answer.

Given year is positive, which expressions for XXX, YYY, and ZZZ will output the correct range? Choices are in the form XXX / YYY / ZZZ. If XXX: Output "1-100" Else If YYY: Output "101-200" Else If ZZZ: Output "201-300" Else: Output "Other"单项选择题

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