squared digit length

[shalini22]

am a vb.net beginner anyone please help me solve the following assignment so that i am able to know where to start from

The following process determines the squared digit length of an integer. Take
any integer and add up the squares of its digits. This will give you another
integer. Repeat this procedure until the number you end up with is 1 or 4.
The number of times this process has to be repeated before it gets to one or
4 is the squared digit length. For example, if we start with 48, we get:
4^2 + 8^2 = 80
8^2 + 0^2 = 64
6^2 + 4^2 = 52
5^2 + 2^2 = 29
2^2 + 9^2 = 85
8^2 + 5^2 = 89
8^2 + 9^2 = 145
1^2 + 4^2 + 5^2 = 42
4^2 + 2^2 = 20
2^2 + 0^2 = 4
1
This process shows that the squared digit length of 48 is 10.