Chapter 5.8, Problem 40SC

Explanation of Solution

Input checks:

The given problem is to process the rate weights and the following are the input checks need to be done,

• First, check for “in.hasNextDouble()” to check whether the input is double value or not.
• Then, check the weight of the rat which must not be less than or equal to “0” and this is because, the weight of the rat surely be a positive value.
• It cannot be exactly predict the weight of “New Guinea” rat, but the weight will not be more than 2 kg. Normally, the house rat weighs up to “0.2” kg and if the rat weights more than 10 kg then that is an input error.

The following source code describes the input checks for rat weights.

//Check if the input is in double

if (in.hasNextDouble())

{

    //assign the weight

    double weight = in.nextDouble();

    //Check if the weight is less than 0

    if (weight < 0)

    {

        //print the message that weight must not be

  negative

        System.out.println("Error: Weight cannot be

  negative.");

    }

    //Check if the weight is greater than 10

    else if (weight > 10)

    {

        /*Print the error message that weight is greater

  than 10 kg*/

        System...