Here is a statement: class temporary  {  public:  void set(string, double, double);  void print();  double manipulate();  void get(string&, double&, double&);  void setDescription(string);  void setFirst(double);  void setSecond(double);  string getDescription() const;  double getFirst()const;  double getSecond()const;  temporary(string = "", double = 0.0, double = 0.0);  private:  string description;  double first;  double second;  };  How can I write a definition of the member function manipulate that returns a decimal number as follows: If the value of description is "rectangle", it returns first * second; if the value of description is "circle", it returns the area of the circle with radius first; if the value of description is "sphere", it returns the volume of the sphere with radius first; if the value of description is "cylinder", it returns the volume of the cylinder with radius first and height second; otherwise, it returns the value -1.

Algorithm: temporary::manipulate()

Input:
- None

Output:
- Result of the manipulation based on the description:
  - If description is "rectangle", return the area of the rectangle (first * second).
  - If description is "circle", return the area of the circle with radius first.
  - If description is "sphere", return the volume of the sphere with radius first.
  - If description is "cylinder", return the volume of the cylinder with radius first and height second.
  - Otherwise, return -1 to indicate an invalid description.

Steps:
1. Check the value of the 'description' member variable:
   1.1 If 'description' is equal to "rectangle", do the following:
       1.1.1 Calculate the area of a rectangle:
             result = first * second
       1.1.2 Return 'result'
   1.2 If 'description' is equal to "circle", do the following:
       1.2.1 Calculate the area of a circle:
             result = π * first * first (where π is a constant, approximately 3.14159265359)
       1.2.2 Return 'result'
   1.3 If 'description' is equal to "sphere", do the following:
       1.3.1 Calculate the volume of a sphere:
             result = (4.0 / 3.0) * π * first * first * first
       1.3.2 Return 'result'
   1.4 If 'description' is equal to "cylinder", do the following:
       1.4.1 Calculate the volume of a cylinder:
             result = π * first * first * second
       1.4.2 Return 'result'
   1.5 Otherwise (for an invalid 'description'):
       1.5.1 Return -1 to indicate an invalid description.