Count Set Bits in an Integer

Code

#include <stdio.h>

int countSetBits(unsigned int n) {
    // Write your code here
    int count=0,pos=0;
    for(pos=31;pos>=0;pos--){
        if(n>>pos&1){
            count++;
        }
    }
    return count;
}

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

Solving Approach

int count=0,pos=0;
    for(pos=31;pos>=0;pos--){
        if(n>>pos&1){
            count++;
        }
    }
    return count;
    
  unsigned int is 32bits
  
  1.   i am iterating to MSB(31) to LSB(0).
  
  2. 	n>>pos :- it right shifting pos to 0 th postion
  
  3.	&1 :- checking the bit set or not.
  
  4.	if the bit is set increment the count.