/*
 * File: hw4.c
 * SID: A15506859
 * Name: Khanh Pham
 * Date: October 23, 2019
 * Sources of help: None
 *
 * This program will be a simple geometry calculator which will allow the user to calculate the area, surface area, and volume of different shapes. The program will have functions, choices, user input, and looping.
 */

 #include <stdio.h>
 #include <math.h>
 #define _USE_MATH_DEFINES
 #define squareOption '1'

 //Function prototypes
 void displayMenu();
 char getCharInput();
 double getDoubleInput();

 double areaSquare(double width);
 double areaRectangle(double width, double height);
 double areaCircle(double radius);

 double surfaceAreaCube(double width);
 double surfaceAreaCylinder(double radius, double height);

 double volumeCube(double width);

 /*
  * The main function has a do-while loop to display the menu and conditional switch-case statements to perform user's choice of calculation using pass by value.
  */

  int main()
  {
    char menuChoice;
    double width;
    double height;
    double radius;
    double result;


    do
    {
        displayMenu();
        menuChoice = getCharInput();
        switch( menuChoice )
        {
            case squareOption:
                // printf("Menu Choice Is: %d \n", menuChoice);
                printf("Enter width: ");
                width = getDoubleInput();
                result = areaSquare(width);
                printf("Result: %.2lf meters\n\n", result);
                break;
            case '2':
                printf("Enter width: ");
                width = getDoubleInput();
                printf("Enter height: ");
                height = getDoubleInput();
                result = areaRectangle(width, height);
                printf("Result: %.2lf meters\n\n", result);
                break;
            case '3':
                printf("Enter radius: ");
                radius = getDoubleInput();
                result = areaCircle(radius);
                printf("Result: %.2lf meters\n\n", result);
                break;
            case '4':
                printf("Enter width: ");
                width = getDoubleInput();
                result = surfaceAreaCube(width);
                printf("Result: %.2lf meters\n\n", result);
                break;
            case '5':
                printf("Enter radius: ");
                radius = getDoubleInput();
                printf("Enter height: ");
                height = getDoubleInput();
                result = surfaceAreaCylinder(radius, height);
                printf("Result: %.2lf meters\n\n", result);
                break;
            case '6':
                printf("Enter width: ");
                width = getDoubleInput();
                result = volumeCube(width);
                printf("Result: %.2lf meters\n\n", result);
                break;
            case 'q':
                printf("Goodbye!");
                break;
            case 'Q':
                printf("Goodbye!");
                break;
            default:
                // printf("Menu Choice Is: %d \n", menuChoice);
                printf("Invalid choice");
                break;
            // printf("Result: %.2lf meters\n\n", result);
        }

    }while(menuChoice >= 49 && menuChoice <= 54);

    return 0;
  }

  //Function defintions
  void displayMenu()
  {
    printf("Geometry Calculator:\n1) Area of a Square\n2) Area of a Rectangle\n3) Area of a Circle\n4) Surface Area of a Cube\n5) Surface Area of a Cylinder\n6) Volume of a Cube\n\nEnter choice (Q/q to quit): ");
  }

  char getCharInput()
  {
    char menuChoice;
    scanf("%c", &menuChoice);
    getchar();
    return menuChoice;
  }

  double getDoubleInput()
  {
    double dimension;
    scanf("%lf", &dimension);
    getchar();
    return dimension;
  }

  double areaSquare(double width)
  {
    return width*width;
  }

  double areaRectangle(double width, double height)
  {
    return width*height;
  }

  double areaCircle(double radius)
  {
    return M_PI*radius*radius;
  }

  double surfaceAreaCube(double width)
  {
    return 6*(width*width);
  }

  double surfaceAreaCylinder(double radius, double height)
  {
    return (2*(M_PI*radius*radius)) + ((2*M_PI*radius)*height);
  }

  double volumeCube(double width)
  {
    return pow(width, 3);
  }