How to count the number of set bits in a 32-bit integer?
8 bits representing the number 7 look like this: 00000111 Three bits are set. What are algorithms to determine the number of set bits in a 32-bit integer? 63 s 63
bit-manipulation
What are bitwise shift (bit-shift) operators and how do they work?
I’ve been attempting to learn C in my spare time, and other languages (C#, Java, etc.) have the same concept (and often the same operators) … What I’m wondering is, at a core level, what does bit-shifting (<<, >>, >>>) do, what problems can it help solve, and what gotchas lurk around the bend? In … Read more
How do you set, clear, and toggle a single bit?
How do you set, clear, and toggle a bit? 2 27 Setting a bit Use the bitwise OR operator (|) to set a bit. number |= 1UL << n; That will set the nth bit of number. n should be zero, if you want to set the 1st bit and so on upto n-1, if … Read more
Explain the use of a bit vector for determining if all characters are unique
int checker is used here as a storage for bits. Every bit in integer value can be treated as a flag, so eventually int is an array of bits (flag). Each bit in your code states whether the character with bit’s index was found in string or not. You could use bit vector for the same reason instead … Read more
