Bitgewise Count Total Set -Bits
//WAP to find setbits (total 1's in binary ex. n= 5 => 101 => 2 setbits
int count{}, num{};
cin >> num;
while (num > 0) {
count = count + (num & 1); // num&1 => it gives either 0 or 1
num = num >> 1; // bitwise rightshift
}
cout << count; //count is our total setbits
paramjeetdhiman