ludic/docs/language/builtins/fn-read_char.md
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docs(api): per-symbol pages, fuzzy search, deep token linking, hover cards
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

913 B

id name category kind tokens sig tip order
fn-read_char read_char builtins builtin read_char read_char() -> int Read one byte from standard input, or -1 at end of input. 24

Reads a single byte from standard input and returns its value, or -1 when the input has ended. It is the foundation for headless, pipe-driven runs: a test or tool can feed the program a stream of bytes and process them one at a time, looping until read_char returns -1. Compare the byte against character literals such as 'a' to interpret it. It takes no arguments and advances through the input on each call.

program CountInputBytes {
  handler DrainInput phase Start {
    var byte_count: int = 0
    var next_byte = read_char()
    while next_byte != -1 {
      byte_count = byte_count + 1
      next_byte = read_char()
    }
    print(byte_count)
  }
}