Question

This is a practice assignment for a class i'm in, and i can't figure out how to go about it. Could you please give some guidance/help on completing this  

* Function to calculate the total wall area and ceiling/floor area * of a rectangular room. The function uses pass-by-reference to give * the provide these calculations from the same function call. @params len1 - length of one side of floor/ceiling (in m) @pre > 0 len2 - length of other side of floor/ceiling (in m) @pre > 0 height - distance between floor and ceiling in room (in m) @pre > 0 wallArea - total area of wall (in m^2) @pre > 0 ceilingArea - total area of ceiling (in m^2) @pre > 0 floorArea - total area of floor(in m^2) @pre > @modifies WallArea, ceilingArea and floor Area to hold the area of the room's walls, ceiling and floor, respectively * @returns nothing void roomAreas (double len1, double len2, double height, double& wallArea, double& ceilingArea, double& floor Area); You are expected to call roomAreas () when calculating the material costs for the room in the function described by the contract below. * Function to calculate the total cost of materials for paint, ceiling and floor tiles * for a rectangular room. * @params lenl - length of one side of floor/ceiling (in m) @pre > 0 len2 - length of other side of floor/ceiling (in m) @pre > 0 height - distance between floor and ceiling in room (in m) @pre > 0 paintCost - cost of paint in dollars per square meter ($/m^2) cTilesCost - cost of ceiling tiles in dollars per square meter ($/m^2) flooring Cost - cost of flooring materials in dollars per square meter ($/m^2) * @returns total cost of materials in $ double totalRoomCosts(double leni, double len2, double height, double paintcost, double cTilesCost, double flooringCost);

Answer 1

void roomAreas(double len1, double len2, double height, double &wallArea, double &ceilingArea, double &floorArea) {
        
        wallArea = (len1 * height + len2 * height) * 2;
        ceilingArea = len1 * len2;
        floorArea = len1 * len2;
}

double totalRoomCosts(double len1, double len2, double height, double paintCost, double cTilesCost, double flooringCost) {
        double wallArea, ceilingArea, floorArea;
        
        roomAreas(len1, len2, height, wallArea, ceilingArea, floorArea);
                
        return paintCost * wallArea + cTilesCost * ceilingArea + flooringCost * floorArea;
}