public class AreaCalculator {
    public static void main(String[] args) {
        System.out.println("Thank you for using the area calculator");
        System.out.println("This calculator lets you get the area of: ");
        System.out.println("1 - Square\n2 - Rectangle\n3 - Triangle\n4 - Circle\n");

        
        //Task 5 – Call area functions.

        double square = areaSquare(2);
        double rectangle =areaRectangle(1, 2);
        double triangle = areaTriangle(1, 2);
        double circle = areaCircle(2);
        
        
       
        


        //Task 7 – Call a function that prints all the areas. 
        printAreas(square, rectangle, triangle, circle);

    }

    //Task 1 - Write a function that calculates the area of a square. 
    public static double areaSquare(double side) {
        if (side < 0) {
            System.out.println("Error: impossible");
            System.exit(0);

        }
        else {
            return side * side;
        }
        return 0;
    }


    /**
     * Function name: areaSquare - returns the area of a square.
     * @param side (double)
     * @return the area (double)
     * 
     * Inside the function: 
     *  1. If the side is negative, prints "Error: impossible" and terminates the java program.
     *  2. Calculates the area of the square. A = side²
     */
    


    //Task 2 - Write a function that calculates the area of a rectangle. 
    public static double areaRectangle(double length, double width) {
        if (length < 0 || width < 0) {
            System.out.println("Error: impossible");
            System.exit(0);
        }
        else {
            return length * width;
        }
        return 0;
    }

    /**
     * Function name: areaRectangle – returns the area of a rectangle.
     * @param length (double).
     * @param width  (double).
     * @return the area (double)
     * 
     * Inside the function: 
     *  1. If the length OR width is negative, prints "Error: impossible" and terminates the program.
     *  2. Calculates the area of the rectangle. A = length * width
     */
    
    //Task 3 - Write a function that calculates the area of a triangle. 

    /**
     * Function name: areaTriangle – it returns the area of a triangle.
     * @param base: (double).
     * @param height: (double).
     * @return the area (double)
     * 
     * Inside the function: 
     *  1. If the base OR height is negative, prints "Error: impossible" and terminates the program.
     *  2. Calculates the area of the triangle. A = (base * height)/2
     */ 
    public static double areaTriangle(double base, double height) {
        if (base < 0 || height<0) {
            System.out.println("Error: impossible");
            System.exit(0); 

        }
        else{
            return (base * height) / 2;
        }
        return 0;
         
    }

    //Task 4 - Write a function that calculates the area of circle. 


    /**
     * Function name: areaCircle – it returns the area of a circle.
     * @param radius (double).
     * @return area (double)
     * 
     * Inside the function: 
     *  1. If the radius is negative, prints "Error: impossible" and terminates the program.
     *  2. Calculates the area of the circle. 
     */ 
    public static double areaCircle (double radius) {
        
        if (radius<0){
            System.out.println("Error: impossible");

        }
        else 
        {
            return (radius*radius*3.14);  
        }
        return 0;
        
  
    }



    //Task 6: Write a function that prints every area.


    /**
     * Function name: printAreas – it prints four areas
     * @param square – square area (double)
     * @param rectangle – rectangle area (double)
     * @param triangle – triangle area (double)
     * @param circle – circle area (double)
     * 
     * Inside the function:
     *  1. print: ("Square area: <square area>")
     *  2. print: ("Rectangle area: <rectangle area>")
     *  3. print: ("Triangle area: <triangle area>")
     *  4. print: ("Circle area: <circle area>")
     * 
     */

     public static void printAreas(double square, double rectangle, double triangle, double circle){
        System.out.println("sqaure area: " + square);
        System.out.println("rectangle area: "+ rectangle);
        System.out.println("triangle are: "+ triangle);
        System.out.println("Circle area: "+circle);

     }


}