An Integers query

I'm very confused. Can someone explain me this?

32     ⟵This gets to 32
00032  ⟵This gets to 26

^{See yourself at IDEOne: Python, Java 开发者_如何转开发or Bash.}

Why do zeros on the left matter?

---

A prefix zero means the number is parsed as an octal. Octal 32 is 26 in decimal system.