IN C++ please

2. Using the class "c1" given below write a COMPLETE CODE for the two methods "sum" and "multiply" inside the yellow boxes provided. class c1 f float f; public: c1(); nc1(); float multiply(int); // Multiply f by a certain factor and return the product float sum(c1) /// Returns the sum of the ids of two objects I/ Write a COMPLETE CODE for sum method with function heading. main ()) // Write a COMPLETE CODE for multiply method with function heading