Math function step

Question

I need a function that returns:

• for any number from the range => the result

  [0.001,0.01) => 0.01

  [0.01,0.1) => 0.1

  [0.1,1) => 1

  [1,10) => 10

  [10,100) => 100

  and etc.

My first idea was to use if, but this is the worst way. Is there a simple solution?

Answer 1

10^(floor(log(x) + 1))