rust_demos 0.1.0

Aa demo crate
Documentation 
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pub trait Calculate{
	fn calc_area(&self)->u16;
	fn calc_peri(&self)->u16;

	fn show(&self)->String{
		format!(" {} ,Area={},Perimeter={}",self.to_str(),self.calc_area(),self.calc_peri())
	}
	fn to_str(&self)->String;
}
pub struct Square{
	side:u16
}
pub struct Rectangle{
	length:u16,
	breadth:u16,
}
impl Calculate for Square{
	fn calc_area(&self)->u16{
		self.side*self.side
	}
	fn calc_peri(&self)->u16{
		4*self.side

	}
	fn to_str(&self)->String{
		format!("For the Square with with side{}",self.side)
	}
}
impl Calculate for Rectangle{
	fn calc_area(&self)->u16{
		self.length*self.breadth
	}
	fn calc_peri(&self)->u16{
		2*(self.length+self.breadth)
	}
	fn to_str(&self)->String{
		format!("For the Rectangle with with length {} breadth {}",self.length,self.breadth)
	}
}
fn choice(poly:&impl Calculate){
	println!("{}", poly.show());
}
fn main(){
	let s=Square{side:3};
	//println!("\n{}",s.show());

	let r=Rectangle{length:2,breadth:8};
	//println!("\n{}",r.show());

	let mut inp=String::new();
	println!("----------MENU--------");
	println!("1.Square");
	println!("2.Rectangle");
	println!("Choose 1/2");
	std::io::stdin().read_line(&mut inp).expect("Failed to read");
	let ch:u8=inp.trim().parse().expect("Unable to parse");
	if ch==1{
		choice(&s);
	}
	else{
		choice(&r);
	}

}