.format ?

[Gintaras]

Macro Macro1820

Code:

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str s = "5"
int z = 2 ;; amount of zero's

s.set('0' s.len z)

out s

With str.format also possible in QM 2.3.3.
Macro Macro1821

Code:

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str s = "5"
int z = 2 ;; amount of zero's

s.formata("%.*m" z '0')

out s

But in this case better is str.set. Your code also OK, when z is not too big. Even shorter is: rep(z) s + "0"