A Collection of Bit Programming Interview Questions solved by Dr Antonio Gulli

By Dr Antonio Gulli

Bits is the second one of a sequence of 25 Chapters dedicated to algorithms, challenge fixing, and C++ programming. This publication is ready low point bit programming

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Extra resources for A Collection of Bit Programming Interview Questions solved in C++ (Volume 3)

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Then we need to shift left (respectively right) of one position and OR the two intermediate results. Code unsigned int swapBits(unsigned int x) { unsigned int evenBits = x & 0xAAAAAAAA; unsigned int oddBits = x & 0x55555555; evenBits >>= 1; oddBits <<= 1; return (evenBits | oddBits); } 2. Print the binary representation of an unsigned int Solution An easy solution is to AND the bit with the number Code void bin(unsigned n) { for (unsigned int i = 1 << 31; i > 0; i = i >> 1) if (n & i) std::cout << 1; else std::cout << 0; } 3.

In other languages this situation will throw and exception. The solution is to compute: It is quite amazing to think that it took more than 60 years to detect a bug in a piece of code so commonly used in the industry and studied by generations of students and academics!! ABOUT THE AUTHOR An experienced data mining engineer, passionate about technology and innovation in consumers’ space. Interested in search and machine learning on massive dataset with a particular focus on query analysis, suggestions, entities, personalization, freshness and universal ranking.

This requires inputs to be represented with the same number of bits and any overflow beyond those bits is discarded from the result. Indeed zero has only a single representation. Code int complement2(int n) { n = ~n; n = n + 1; return n; } 14. Isolate the rightmost bit set to 1 Solution Let’s build some example. Suppose that , if we compute in two’s complement we get . Therefore selects the rightmost bit set to 1. 15. Create a mask for trailing zeros Solution If we are able to identify the rightmost bit set to 1, then we can create the mask for trailing zeros just subtracting 1.

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