Add refinements to the program outline below and write the final C++ program.// Compute...

Add refinements to the program outline below and write the final C++ program.

//    Computes the sum and average of two numbers#include <iostream>using namespace std;int main(){     // Declare any constants and variables you need.    // Read two numbers.   // Compute the sum of the two numbers.   // Compute the average of the two numbers.   // Display sum and average.   return 0;}