count set bits in an integer code example
Example 1: Count set bits in an integer c++
//Method 1
int count = __builtin_popcount(num);
//Method 2
int count = 0;
while (num) {
count += num & 1;
n >>= 1;
}
Example 2: bit counting
countBits = (n) => n.toString(2).split("0").join("").length;
Example 3: bitwise 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