Question

How to rotate a number to the right by N bits using bit operation in C++

Answer 1

#include <iostream>
#include <bitset>

void print_bits(unsigned int n) { 
    std::bitset<16> bits(n);
    std::cout << bits << '\n';
}

unsigned int rotate_right(unsigned int num, unsigned int n) {
	return (num >> n) | (num << (32 - n));
}

int main(void)
{
	int num = 16;

	print_bits(num);

	num = rotate_right(num, 2);

	print_bits(num);

	std::cout << num;

	return 0;
}




/*
run:

0000000000010000
0000000000000100
4

*/

 

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