Kairi's code

#include <iostream>

int main()
{
    int nRooms, nWallSpace;
    float paintCost;
    
    std::cout << "How many rooms will be painted? >> ";
    std::cin >> nRooms;
    
    if (nRooms < 1) {
        std::cout << "Error: Number of rooms needs to be at least 1.\n";
        return 1;
    }
    
    std::cout << "How much does the paint cost per gallon? >> ";
    std::cin >> paintCost;
    
    if (paintCost < 10) {
        std::cout << "The paint cannot cost less then RM 10.00\n";
        return 1;
    }
    
    std::cout << "How many square feet of wall space per room? >> ";
    std::cin >> nWallSpace;
    
    if (nWallSpace < 0) {
        std::cout << "Wall space cannot be negative.\n";
        return 1;
    }
    
    // Units will be rounded up
    float nUnits = (float(nWallSpace) / 115) * nRooms;
    float nGallonsOfPaint = nUnits;
    float workHours = nUnits * 8;
    float totalPaintCost = paintCost * nGallonsOfPaint;
    float laborCharges = workHours * 25;
    float totalPaintJobCost = laborCharges + totalPaintCost;
    
    std::cout << "Number of gallons of paint required: " << nGallonsOfPaint << "\n";
    std::cout << "Hours of labor required: " << workHours << "\n";
    std::cout << "Total cost of the paint: " << totalPaintCost << "\n";
    std::cout << "Labor charges: RM " << laborCharges << "\n";
    std::cout << "Total paint job cost: " << totalPaintJobCost << "\n";

    return 0;
}