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How to count set bits of an integer in C

1 Answer

0 votes
#include <stdio.h> 
unsigned int count_set_bits(unsigned int n) { 
    unsigned int count = 0; 
    while (n) { 
        count += n & 1; 
        n >>= 1; 
    return count; 

int main() 
    int n = 45; // 00101101
    printf("%i", count_set_bits(n)); 
    return 0; 


answered May 8, 2019 by avibootz
edited May 9, 2019 by avibootz