qsort a user-defined type

[Lucas]

How qsort by age?

Code:

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type datt str'name str'address age

ARRAY(datt) adatt
adatt.create(3)
adatt[0].name="John"
adatt[0].address="street3, 10"
adatt[0].age=30
adatt[1].name="Anne"
adatt[1].address="street1, 20"
adatt[1].age=27
adatt[2].name="Michael"
adatt[2].address="street2, 15"
adatt[2].age=15
int i
for i 0 adatt.len
,out adatt[i].name
,out adatt[i].address
,out adatt[i].age