"Tips" Determines whether two integers are of the same order of magnitude

Leetcode brush problem, need to use, known integer a, b, and a>b, to determine whether AB is the same order of magnitude.

The first thought is to keep dividing by 10, to get each number of orders of magnitude again to compare, too troublesome;

Turn to string comparison, or trouble and time-consuming, consult others, get this method, enlightened, why did not think of themselves before:

Int (log10 (A))-int (log10 (B))

After rounding the integer with the base 10 logarithm, you can get the order of the integers, if AB is the same order of magnitude, and the formula is 0.

"Tips" Determines whether two integers are of the same order of magnitude