Compare two version numbers version1 and version2.
- If version1 > version2 return 1,
- If version1 < version2 return -1,
- otherwise return 0.
You may assume that the version strings are non-empty and contain only digits and the
. character does not represent a decimal point and is used to separate number sequences.
2.5 is not
"two and a half" or
"half way to version three", it is the fifth second-level revision of the second first-level revision.
Here is an example of version numbers ordering:
0.1 < 1.1 < 1.2 < 1.13 < 1.13.4