can anyone show me how to do this question correctly

3. COMPLETE the code in all the yellow boxes given below as per instructions. dass 01 float f; public: o1(); no1(); void assign(float); I/ Write the prototype to return the sum of the values of four oblects. Retum 01(1) j; I/Write the function heading \& a COMPLETE method "SUM" to return the sum of the values of four abject. Class ol int ) main() f // Write a CALUING statement to "SUM" method. Make sure that all the variables/parameters in the calling statement are valid before the method is called