The condition on the if statement below to set the taxRate to 0.15 for the residents of the states of New Jersey and New York would be (assume the variable state has been declared and has a value):

if (condition)

taxRate = 0.15;

Question

The condition on the if statement below to set the taxRate to 0.15 for the residents of the states of New Jersey and New York would be (assume the variable state has been declared and has a value):

if (condition)

taxRate = 0.15;

BlackTom AI · Accepted Answer

Use the logical OR operator (||) to test whether the single variable state matches either "NJ" or "NY". This produces a true result when state is equal to one of the two strings, causing the if block to execute and set taxRate to 0.15.

1. Relevant knowledge points and concepts
- Equality comparison: compare the variable state to a string literal (state == "NJ" and state == "NY"). In languages like JavaScript and C++ (std::string), == checks string equality. (In Java, string equality is normally tested with .equals(), but the answer choices use == so we assume a language where == compares strings.)
- Logical OR (||): returns true if either left or right operand is true.
- Logical AND (&&): returns true only if both operands are true.

2. Step-by-step reasoning
We need the if condition to be true when state is "NJ" OR "NY". That requirement maps directly to: state == "NJ" || state == "NY".

3. Intermediate evaluations (examples)
- If state = "NJ": evaluate (state == "NJ") → true; (state == "NY") → false. true || false → true → taxRate set to 0.15.
- If state = "NY": (state == "NJ") → false; (state == "NY") → true. false || true → true → taxRate set to 0.15.
- If state = "CA": (state == "NJ") → false; (state == "NY") → false. false || false → false → taxRate not set to 0.15.

4. Why the correct answer is correct
state == "NJ" || state == "NY" explicitly checks both possible state values and uses OR to ensure the condition is true for either case. That matches the requirement to set taxRate for residents of New Jersey or New York.

5. Why the other options are incorrect
- state == "NJ" && state == "NY": AND requires both to be true simultaneously, impossible for one variable, so it never becomes true.
- state == "NJ" && "NY": the right operand is just a string literal, not a comparison; this is syntactically incorrect or leads to unintended truthy behavior in some languages.
- state = "NJ" || state = "NY": single = is assignment, not comparison; this assigns values instead of comparing and is incorrect or will have unintended side effects.

6. Conclusion
The correct condition is state == "NJ" || state == "NY", which matches the provided answer.

The condition on the if statement below to set the taxRate to 0.15 for the residents of the states of New Jersey and New York would be (assume the variable state has been declared and has a value): if (condition) taxRate = 0.15;单项选择题

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