public void onClick(View view) { //declare variables double a,b,c; //text values from x and y String S1= inputXEdit_Text.getText().toString(); String S2 = inputYEdit_Text.getText().toString(); a= Double.parseDouble(S1); b= Double.parseDouble(S2); //adding operation with variables c=a+b; //c=a-b; // convert the answer to a number String s=Double.toString(c); //display result it textView textView.setText(s); Please help to add math operations(-, * , / ) on Java

Which function members are mutators?

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.

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