I want to understand this problem

Question

What is the output of this code?
int sum=0;
for(int k=16; k!=1; k/=2) {
sum += k;
}
cout << sum;

Answer 1

sum=sum+k
sum=0+16
sum=16
Now k=8 still not equal to 1 so loop runs again
sum=sum+k
sum=16+8
sum=24
now k=4
sum=24+4
sum=28
now k=2
sum=28+2
sum=30
Now k=1 so k!=1 condition evaluates to false so loop stops running and 30 is printed

Answer 2

You gonna ask every question? please try some on your own.
For hint:
For each iteration k is added to sum variable and , then k is divided by 2 until k != 1