Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int theCount=0;
    while (n != 0) {
        theCount += (n & 1);
        n >>= 1;
    }
    return theCount;
}

int main() {
    int n;
    scanf("%d", &n);
    printf("%d", countSetBits(n));
    return 0;
}

Solving Approach

Count the bits by bitwise AND with ONE , bit 0, then shift right by one bit until no more set bits.