pub fn add(left: usize, right: usize) -> usize {
left + right
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn it_works() {
let result = add(2, 2);
assert_eq!(result, 4);
}
}
pub mod add_salary {
pub fn study(name:String) {
println!("面向加薪学习 {}",name);
}
}