// EXIT:0
// OUTPUT:ok 42 -7
unit strings;
import std.io;
import std.str;
import std.fmt;

fn show(v: i32) -> void {
    var buf: [16]u8 = [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0];
    let n: usize = fmt.fmt_i32(buf[..], v);
    io.print(" ");
    io.print(buf[0..n]);
}

fn main() -> i32 {
    if not str.eq(str.trim("  hello  "), "hello") { return 1; }
    if not str.starts_with("ferro", "fer") { return 2; }
    if str.find("abcdef", "cd") != 2 { return 3; }
    if str.find("abcdef", "zz") != 6 { return 4; }
    let a: i32 = str.parse_int("42") orelse 0;
    let b: i32 = str.parse_int("-7") orelse 0;
    let bad: i32 = str.parse_int("12x") orelse 0;
    if bad != 0 { return 5; }
    io.print("ok");
    show(a);
    show(b);
    io.print("\n");
    return 0;
}