// Library named assignment


pub mod read_input {
    use::std::io;
    pub fn read()-> String {
        let mut input = String::new();
        io::stdin().read_line(&mut input);
        input.to_string()
    }
}
    pub fn area_circle (f:f32) -> (f32) {
    let pi:f32= (22.0/7.0);
    let sq:f32 = f * f;
    let ar:f32=sq*pi;
    ar as f32
}
    pub fn pos_neg (c:i32)-> String {
    if c == 0 {
        println!("Entered Zero \n");

    } else if c>=0{
        println!("Entered Positive Number \n");
    }
    else if c <= 0 {

    println!("Entered Negative Number \n");
    }c.to_string()
}
    pub fn vol_sphere (g:f32) -> (f32) {
    let pi:f32= (22.0/7.0);
    let cub:f32 = g * g * g;
    let vol:f32=(4.0*cub*pi)/3.0;
    vol as f32
}


// package code
extern crate assignment;
fn main() {
    //Challenge1
 println!("Challenge1");
 println!("Enter Radius of Circle");
 let mut c1= assignment::read_input::read();
 let c1= c1.trim().parse().unwrap();
 let c1_1=assignment::area_circle(c1);
 println!("Area of circle for given Radius is {} \n", c1_1);

    //Challenge2
 println!("Challenge2");
 println!("Enter Number");
 let mut c2= assignment::read_input::read();
 let c2= c2.trim().parse().unwrap();
 assignment::pos_neg(c2);

    //Challenge4
 println!("Challenge4");
 println!("Enter Radius of Sphere");
 let mut c4= assignment::read_input::read();
 let c4= c4.trim().parse().unwrap();
 let c4_1=assignment::vol_sphere(c4);
 println!("Area of circle for given Radius is {} \n", c4_1);

}