C# increment forms: which statements correctly increase variable a by exactly 1?

Question

Solve this multiple-choice question and choose the correct option.

Accepted Answer

Introduction / Context:Incrementing a variable by 1 is basic, yet syntax traps are common. This question checks your understanding of valid increment expressions in C#. Given Data / Assumptions: Variable a is a numeric type. We must add exactly 1 to the current value of a. Concept / Approach:Valid increment forms include the compound assignment and additive assignment. Expressions must be syntactically correct and semantically add one to the existing value of a. Step-by-Step Solution: a += 1; is valid and increments by 1.a = a + 1; is also valid and increments by 1.++a++; is invalid (you cannot apply both pre and post increment to the same result expression).a ++ 1; is invalid syntax (post-increment has no operand after it).a = +1; assigns positive 1, does not increment. Verification / Alternative check:Compile each form. Only a += 1; and a = a + 1; compile and behave correctly. Why Other Options Are Wrong: A: Invalid compound use of increment operators. C: Invalid grammar. E: Overwrites a with 1 instead of adding 1. Common Pitfalls:Confusing assignment with increment and misusing ++ with extra tokens. Final Answer:a += 1; (Note: a = a + 1; is also correct; among the given choices, both B and D increment by 1. If you must choose one, pick a += 1;.)

C# increment forms: which statements correctly increase variable a by exactly 1?

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