How to pad a number with zeros when printing?

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The fmt package can do this for you:

fmt.Printf("|%06d|%6d|\n", 12, 345)

Output:

|000012|   345|

Notice the 0 in %06d, that will make it a width of 6 and pad it with zeros. The second one will pad with spaces.

Try it for yourself here: http://play.golang.org/p/cinDspMccp

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