Reading from standard input in Nyx is done with read_line(), which blocks until the user presses Enter and returns the typed text as a String. A companion function print_no_newline lets you display a prompt without advancing to the next line, so what you type appears right after the colon.
// Leer una línea de stdin con read_line() y saludar al usuario // En CI/testing: redirigir stdin con echo "Alice" | ./programa fn main() -> int { print_no_newline("Ingresa tu nombre: ") // read_line() lee hasta '\n' desde stdin let nombre: String = read_line() // Eliminar posible '\n' al final con trim let nombre_limpio: String = nombre.trim() if nombre_limpio.length() == 0 { print("Hola, desconocido!") } else { print("Hola, " + nombre_limpio + "! Bienvenido a Nyx.") } print("Longitud del nombre: " + int_to_string(nombre_limpio.length())) return 0 }
Ingresa tu nombre: Alice Hola, Alice! Bienvenido a Nyx. Longitud del nombre: 5
How it works
print_no_newline(s) writes a string to stdout without appending a newline, unlike the regular print. This is the idiomatic way to display an inline prompt so the user's input appears on the same line.
read_line() reads characters from stdin until it encounters a newline character. The returned string may include a trailing \n depending on the platform and how input was piped, so calling .trim() is good practice to strip leading and trailing whitespace.
The if/else guard handles the empty-input case gracefully. In automated testing you can feed input via shell redirection: echo "Alice" | ./programa, which makes read_line() return "Alice\n" without blocking.