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use_gravity_basic_usage/
basic_usage.rs

1use use_gravity::{GRAVITATIONAL_CONSTANT, GravityBody, escape_velocity, gravitational_force};
2
3fn main() -> Result<(), &'static str> {
4    let earth = GravityBody::new(5.972e24, 6.371e6).ok_or("invalid Earth body")?;
5    let surface_gravity = earth
6        .surface_gravity()
7        .ok_or("invalid surface gravity calculation")?;
8    let force = gravitational_force(1.0, 1.0, 1.0).ok_or("invalid force calculation")?;
9    let velocity = escape_velocity(5.972e24, 6.371e6).ok_or("invalid escape calculation")?;
10
11    assert!((force - GRAVITATIONAL_CONSTANT).abs() < f64::EPSILON);
12    assert!(surface_gravity > 9.8);
13    assert!(velocity > 11_000.0);
14
15    Ok(())
16}