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pub mod main {

    pub mod basicfun {

        pub fn add(x: &mut f64, y: &mut f64) {
            let res = *x + *y;
            println!("{}", res);
        }

        pub fn sub(x: &mut f64, y: &mut f64) {
            let res = *x - *y;
            println!("{}", res);
        }

        pub fn mul(x: &mut f64, y: &mut f64) {
            let res = *x * *y;
            println!("{}", res);
        }

        pub fn div(x: &mut f64, y: &mut f64) {
            let res = *x / *y;
            println!("{}", res);
        }
    }

    pub mod squarefun {

        pub fn squr(number: &mut f64) {
            let abc = *number * (2 as f64);
            println!("{}", abc);
        }

        pub fn cube(number: &mut f64) {
            let abc = *number * (3 as f64);
            println!("{}", abc);
        }

        pub fn power(x: &mut f64, y: &mut f64) {
            let a = *x as u32;
            let b = *y as u32;
            let mut res: f64 = 0.0;

            for _i in 1..b {
                if res != 0.0 {
                    res = res * (a as f64);
                    println!(" {}", res);
                } else {
                    res = (a as f64) * (a as f64);
                    println!(" {}", res);
                }
            }
        }

    }

}