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#[allow(dead_code)]
/// takes two fields of num
struct Calculator {
    x: i128,
    y: i128,
}

impl Calculator {
    #[allow(dead_code)]
    /// adds two num
    fn add(&self) -> i128 {
        self.x + self.y
    }

    #[allow(dead_code)]
    /// subtracts two num
    fn sub(&self) -> i128 {
        self.x - self.y
    }

    #[allow(dead_code)]
    /// multiplies two num
    fn mul(&self) -> i128 {
        self.x * self.y
    }

    #[allow(dead_code)]
    /// divides two num
    fn div(&self) -> f64 {
        (self.x / self.y) as f64
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn addition() {
        let sum = Calculator { x: 10, y: 10 };

        assert_eq!(sum.add(), 20);
    }

    #[test]
    fn subtraction() {
        let diff = Calculator { x: 100, y: 50 };
        assert_eq!(diff.sub(), 50);
    }
    #[test]
    fn multiplication() {
        let prod = Calculator { x: 5, y: 5 };
        assert_eq!(prod.mul(), 25);
    }

    #[test]
    fn division() {
        let quot = Calculator { x: 50, y: 10 };
        assert_eq!(quot.div(), 5.0);
    }
}