Which is faster? Comparison or assignment?

Question

I\'m doing a bit of coding, where I have to write this sort of code:

if( array[i]==false )
    array[i]=true;

I wonder if it should be re-w

Answer 1

I believe if comparison and assignment statements are both atomic(ie one processor instruction) and the loop executes n times, then in the worst-case comparing then assigning would require n+1(comparing on every iteration plus setting the assignement) executions whereas constantly asssigning the bool would require n executions. Therefore the second one is more efficient.