C#.NET — Which of the following is correct about the Bitwise OR operator (|)?
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AThe | operator can be used to put OFF a bit.
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BThe | operator can be used to invert a bit.
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CThe | operator can be used to check whether a bit is ON.
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DThe | operator can be used to check whether a bit is OFF.
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EThe | operator can be used to put ON a bit.
Answer
Correct Answer: The | operator can be used to put ON a bit.
Explanation
Introduction / Context:This question covers the bitwise OR operator in C#. It is often used in low-level programming to manipulate individual bits.
Given Data / Assumptions:
- Operator: | (bitwise OR).
- Operation compares each bit position of two integers.
Concept / Approach:In bitwise OR, any bit position where at least one operand has 1 results in 1. This is often used to set (turn ON) bits in a bitmask.
Step-by-Step Solution:
Binary example: 0101 | 0010 = 0111. Bit 2 was turned ON. Thus OR ensures a bit becomes 1 if at least one operand has 1.Verification / Alternative check:Apply OR with a mask: value | 0x04 sets bit 2 regardless of its previous state.
Why Other Options Are Wrong:| does not turn OFF, invert, or directly test bits. It only sets ON bits when combined with 1.
Common Pitfalls:Confusing | with & (AND) or ^ (XOR).
Final Answer:The | operator can be used to put ON a bit.