pub static mut N: i32 = 5;

pub const M: i32 = 50;

pub fn add_1()
{
    unsafe {
        N += 1;
        println!("test0 v0.4.0 N: {}", N);
    }
}

pub fn sub_1()
{
    unsafe {
        N -= 1;
        println!("test0 v0.4.0 N: {}", N);
    }
}