Kipper

/**
 * Adds the prefix to the main string.
 * @param pre The prefix that shall be added.
 * @param main The string to append the prefix to.
 */
def prefix(pre: str, main: str) -> str {
  return pre + main;
}

var result: str = prefix("pre", "fix");
call print(f"prefix result: {result}");

def factorial(n: num) -> num {
  var result: num = 1;
  for (var i: num = 1; i <= n; i++) {
    result = result * i;
  }
  return result;
}

for (var n: num = 0; n <= 10; n++) {
  var fact: num = factorial(n);
  if (fact > 1000) {
    call print(f"{n}! = {fact} (big number!)");
  } else {
    call print(f"{n}! = {fact}");
  }
}