Question: How can i use a do while cycle?

Hi to everyone I'm Marco from Italy, I'm new in this forum and I've  Maple 9.

I've to use a "do while cycle", but i don't know how to do it

This is the problem: T(i+1)=T(i) + f[T(i)] until {abs[T(i+1) - T(i)]}/T(i)<0,001

can someone help me to write the correct line commands?thanx ; )

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