Write an inline function that returns the area of a rectangle of length L and width W. L and W are of type double. Write a function area_perim that takes four double arguments, a for area, p for perimeter, L for length, and W for width and returns two doubles, namely the area (a) and perimeter(p) of a rectangle. Write a function that will display numbers from 1 to n, 7 numbers per line. The numbers are separated by one space. The function prototype is as follows: void display Number (int); Write an overloaded function called product. This function returns the product of two integers two double test this function