#[cfg(test)]
mod tests {
    fn number_operation() {
        // addition
        let sum = 5 + 10;
        // subtraction
        let difference = 95.5 - 4.3;
        // multiplication
        let product = 4 * 30;
        // division
        let quotient = 56.7 / 32.2;
        // remainder
        let remainder = 43 % 5;
        println!("sum is:{},difference is:{},product is:{},quotient is:{},remainder is:{}"
                 , sum, difference, product, quotient, remainder)
    }
    #[test]
    fn test_float_data() {
        number_operation();
    }
}