Question

My question is how do I compute 2^(x) in c. I know there is something like shifting that does the same thing. I tried to do total = x << 1, but that didn’t work. I know that if i shift one bit it is the same as multiplying it by two. Or something like that.

int x;

for(x=0; x<4; x++){

total += x <<1; // 

}

When this is done executing I expect the total to be 15 ( 2⁰ + 2¹ + 2² + 2³ )

Any ideas on what I am doing wrong? my total starts off as being 0 and then messes up.

Thanks!

Answer 1

It’s the other way around. 1 << x will give you ‘2 ^ x’.