Find number range intersection

Question

What is the best way to find out whether two number ranges intersect?

My number range is 3023-7430, now I want to test which of the following number

Answer 1

In python

class nrange(object):
    def __init__(self, lower = None, upper = None):
        self.lower = lower
        self.upper = upper
    def intersection(self, aRange):
        if self.upper < aRange.lower or aRange.upper < self.lower:
            return None
        else:
            return nrange(max(self.lower,aRange.lower), \
                          min(self.upper,aRange.upper))