Print & Output

print and println are built-in functions - no import needed. Both take a single value.

Basic usage

func main() -> i32:
  print("Hello, Thagore!")
  println(42)
  println(true)
  return 0

print writes to stdout without a trailing newline. println appends a newline.

Formatting values

print and println accept str, bool, i32, i64, and f64 directly. std.string helpers still matter when you need to build composite strings:

import std.string as string

func main() -> i32:
  let value: i32 = 7
  let label = string.concat("answer = ", string.from_int(value))
  println(label)
  return 0

Stderr output

eprint and eprintln write to stderr:

func main() -> i32:
  eprintln("error: something went wrong")
  return 1

Flush

flush flushes buffered stdout output:

func main() -> i32:
  print("loading...")
  flush()
  return 0

Using extern func printf

For C-style format-string output, declare printf via FFI:

extern func printf(fmt: str, value: i32) -> i32

func main() -> i32:
  printf("The answer is %d\n", 42)
  return 0