Question

Write the following function in Java:

 A function "makeMangler", that takes as input a list M of three
    numbers.  It then builds and returns a "Mangler" function based on M.

    The "Mangler" function that is produced (by your function makeMangler)
    would have the property that it takes as input a list, and returns
    the "mangled" version of that list.  "Mangling" a list means doing
    the following sequence of operations to each item in a list:

    (1) multiply by the first element in M, then
    (2) add the second element in M, then
    (3) multiply by the third element in M.

    For example, if 'makeMangler" was called as follows:

        (makeMangler '(2 3 8))

    a function would be produced that takes as input a list and returns
    the "mangled" version, based on the list '(2 3 8).

    For example, if the original call had been made as follows:

        (define C (makeMangler '(2 3 8)))

    then the produced function C would behave as follows:

       (C '(4 8 2 9))     *** would return (88 152 56 168)
       (C '(-2 3))        *** would return (-8 72)

    Your task is just to write makeMangler, not "C".
    Of course, makeMangler should work for ANY input list, not just (2 3 8).

Answer 1

According to my deductions from the question the following code snippet should work. Not implementing C() fully just for test purpose.

makeMangler method of class Mangle takes 3 inputs and sets the class variables and returns a type interface.

//Mangler.java
package com.test;

public interface Mangler {

   //Tester Class
   void C1(int i, int j, int k, int l);

}

------------------------------------------------------------------------------------------------------------------

//Mangle.java
package com.test;

public class Mangle implements Mangler {

   int num1;
   int num2;
   int num3;
  
   //makeMangler takes 3 inputs returns interface Mangler
   public Mangler makeMangler(int a, int b, int c) {
       Mangle setValues = new Mangle();
      
       setValues.num1 = a;
       setValues.num2 = b;
       setValues.num3 = c;
      
       return setValues;
   }

   @Override
   //Tester class
   public void C1(int i, int j, int k, int l) {
       // TODO Auto-generated method stub
       int temp = i * num1;
       int temp2 = temp + num2;
       temp = temp2 * num3;
       System.out.println("Output C1 is " + temp); //calculated just for one
   }
  
   public static void main(String[] args) {
       Mangle a = new Mangle(); //get class object
       Mangler m = a.makeMangler(2,3,8); //calling make mangler returning interface Mangler
       m.C1(4,8,2,9);
   }

}