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Idiom #156 Format integer with zero-padding

Assign to string s the value of integer i in 3 decimal digits. Pad with zeros if i < 100. Keep all digits if i1000.

s := format('%.3d',[i]);
import std.format : format;
string s = format("%03d", i);
import "fmt"
s := fmt.Sprintf("%03d", i)
s = "%03d" % i
let s = format!("{:03}", i);

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