Rulse to setup project version numbers?

HI, All

Since I don't have any clue what the rules to setup the version number
each time when make a build for projects, Do you have any rules for the
version numbers?

1)When do you increase the build number?
2)When do you increase the release number?
3)When do you increase the minor number?
4)When do you increase the major number?

Thanks for any inputs.

Tiger


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