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Programming-Idioms

Assign to the integer x a random number between 0 and 17 (inclusive), from a crypto secure random number generator.
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Other implementations
import "crypto/rand"
import "math/big"
bi, err := rand.Int(rand.Reader, big.NewInt(18))
x := int(bi.Int64())

crypto/rand.Int works with big ints, and the secure RNG Reader.