type Row {
  name: Text
  count: Int
}

sign(value: Int < 0) (answer: Int) pure {
  answer = -1
}
sign(value: 0) (answer: Int) pure {
  answer = 0
}
sign(value: Int > 0) (answer: Int) pure {
  answer = 1
}

main() (answer: Int) {
  answer = sum([10, 20, 11]) + sign(3)
}

copyCheck() (answer: Bool) {
  original = Row { name = "初始"
    count = 1 }
  changed = original
  changed.name = "修改"
  answer = original.name == "初始" and changed.name == "修改"
}

join(first: Text, second: Text) (answer: Text) pure {
  answer = first + second
}

textCheck() (answer: Text) {
  value = "雪"
  joined = join(value, value)
  answer = joined + value
}

increment(value: Int) (answer: Int) pure {
  answer = value + 1
}

overflowCheck() (answer: Int) {
  answer = increment(9223372036854775807)
}

change(value: Row) (answer: Row) {
  value.name = value.name + "新"
  answer = value
}

pair(value: Int) (count: Int, name: Text) pure {
  count = value
  name = "雪"
}

total(values: List<Int>) (answer: Int) pure {
  answer = sum(values)
}

verify() (answer: Bool) {
  original = Row { name = "雪"
    count = 1 }
  changed = change(original)
  values = [1, 2, 3]
  result = pair(42)
  decimal = 1 / 8
  floating = 1.5e0 + 2.0e0
  skipped = false and overflowCheck() > 0
  answer = main() == 42 and copyCheck() and textCheck() == "雪雪雪" and original.name == "雪" and changed.name == "雪新" and total(values) == 6 and sum(values) == 6 and result.count == 42 and result.name == "雪" and decimal == 0.125 and floating == 3.5e0 and not skipped and length("雪山") == 2 and sign(-3) == -1 and sign(0) == 0
}

arithmetic(value: Int) (answer: Int) pure {
  answer = (value * 3 + 7) // 2
}