Difficulty: Easy
Correct Answer: 99₁₀
Explanation:
Introduction / Context:
Converting binary numbers to decimal is a foundational skill in digital electronics and computer engineering. The question asks for the base-10 value of the binary number 1100011₂. Understanding place values for powers of 2 ensures accurate and quick conversions needed for debugging, data interpretation, and low-level programming.
Given Data / Assumptions:
Concept / Approach:
Each bit in a binary number represents a power of 2, starting from the rightmost bit as 2^0, then 2^1, 2^2, and so on. To convert, multiply each bit by its corresponding power of 2 and sum the results. Only positions with bit value 1 contribute to the sum; positions with 0 contribute nothing.
Step-by-Step Solution:
Write positional weights for 7 bits: 2^6, 2^5, 2^4, 2^3, 2^2, 2^1, 2^0 → 64, 32, 16, 8, 4, 2, 1.Map bits: 1 1 0 0 0 1 1 (from MSB to LSB).Multiply and add only 1-bits: 64 + 32 + 2 + 1.Compute sum: 64 + 32 = 96; 96 + 2 = 98; 98 + 1 = 99.Therefore, 1100011₂ = 99₁₀.
Verification / Alternative check:
Group into convenient chunks: (110)_2 = 6 and (0011)_2 = 3 does not directly apply because the bit groups are unequal; however, a calculator or quick mental addition of powers (64 + 32 + 2 + 1) reconfirms the answer 99₁₀.
Why Other Options Are Wrong:
97₁₀ or 93₁₀ omit one or more powers of 2 in the sum. 29₁₀ is far smaller than the MSB contribution (64) plus the next (32), so it cannot be correct for a 7-bit value starting with 11xxxxx.
Common Pitfalls:
Reading bits right-to-left incorrectly, forgetting a power (often 2^1 = 2), or adding a nonexistent 2^2 term. Always list the powers beneath the bits before summing.
Final Answer:
99₁₀
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