Functions and loops

Functions and loops

Run from the repository or distribution root. Put xen on PATH, or substitute ./bin/xen.

Run

xen check examples/control_flow.xen
xen run examples/control_flow.xen

Expected output

20
enough
2
1

Complete source

control_flow.xen

// SPDX-License-Identifier: MIT OR Apache-2.0
fn doubled(value: Int) -> Int {
    return value * 2;
}

fn main() {
    let mut total = 0;
    for number in 1..5 {
        total = total + doubled(number);
    }
    let label = if total >= 20 { "enough" } else { "more" };
    println(total);
    println(label);
    let mut remaining = 2;
    while remaining > 0 {
        println(remaining);
        remaining = remaining - 1;
    }
}

Download file

Build an executable

xen build examples/control_flow.xen -o app

Run the generated executable on a compatible Linux machine.