Check out example codes for "built in popcount c++". It will help you in understanding the concepts better.

Code Example 1

__builtin_popcount(n))

Code Example 2

// C program to illustrate _builtin_popcount(x) 
  
#include <stdio.h> 
int main() 
{ 
    int n = 5; 
      
    printf("Count of 1s in binary of %d is %d ", 
           n, __builtin_popcount(n)); 
    return 0; 
}

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