View source for Positive decimal integers with the digit 1 occurring exactly twice

=={{header|Go}}==
{{trans|Wren}}
{{libheader|Go-rcu}}
<syntaxhighlight lang="go">package main

import (
    "fmt"
    "rcu"
)

func main() {
    fmt.Println("Decimal numbers under 1,000 whose digits include two 1's:")
    var results []int
    for i := 11; i <= 911; i++ {
        digits := rcu.Digits(i, 10)
        count := 0
        for _, d := range digits {
            if d == 1 {
                count++
            }
        }
        if count == 2 {
            results = append(results, i)
        }
    }
    for i, n := range results {
        fmt.Printf("%5d", n)
        if (i+1)%7 == 0 {
            fmt.Println()
        }
    }
    fmt.Println("\n\nFound", len(results), "such numbers.")
}</syntaxhighlight>

{{out}}
<pre>
Decimal numbers under 1,000 whose digits include two 1's:
   11  101  110  112  113  114  115
  116  117  118  119  121  131  141
  151  161  171  181  191  211  311
  411  511  611  711  811  911

Found 27 such numbers.
</pre>