Finch/examples/types.fn

// Sized numbers and pointers.

fn double(ptr[int] p) {
    p.value = p.value * 2
}

fn main() {
    // everyday: int and float. For bytes and hardware: exact sizes.
    u8 small = 255
    i32 points = -1000
    big := u64(0xFFFF_FFFF)
    f32 half = 0.5

    small += 1                       // u8 wraps around, like real hardware
    print("u8 255 + 1 =", small)
    print("points:", points, "big:", big, "half:", half)

    i64 wide = points                // a smaller type fits into a bigger one by itself
    print("wide:", wide)

    // pointers: addr(x) gives you where x lives, p.value is what is there
    int x = 21
    p := addr(x)
    double(p)
    print("x is now", x)

    ptr[int] nothing = null
    if nothing == null {
        print("nothing points nowhere")
    }
}