#include <stdio.h>
#include <math.h>

#define PI 3.14

float calcDistance(int x1, int x2, int y1, int y2);
float calcHypotenuse(int side1, int side2);
float calcCircleInfo(int radius, char info);
int calcRectangleArea(int length, int width);
int calcSquareArea(int length);

enum CalcOption {
    distance = 1,
    hypotenuse,
    circleInfo,
    rectangleArea,
    squareArea,
    nothingSelected

};
int main()
{
    int input = 0, working = 1, num1 = 0, num2 = 0;

    while (working == 1)
    {
        printf("Welcome to my calculator!\n");
        printf("Choose option:\n");
        printf("1 - Calc distance between 2 points\n"
                "2 - Calc hypotenuse of triangle\n"
                "3 - Calc area and permieter of circle\n"
                "4 - Calc area of rectangle\n"
                "5 - Calc area of square\n"
                "6 - Exit\n");

        scanf("%d", &input);
        switch (input)
        {
            case distance:
            {
                int x1 = 0, x2 = 0, y1 = 0, y2 = 0;

                printf("Enter point1 coordinates: ");
                scanf("%d %d", &x1, &y1);

                printf("Enter point2 coordinates: ");
                scanf("%d %d", &x2, &y2);

                printf("Distance is %.2f\n", calcDistance(x1, x2, y1, y2));
                break;
            }
            case hypotenuse:
            {
                int side1 = 0, side2 = 0;

                printf("Enter 2 sides of the triangle: ");
                scanf("%d %d", &side1, &side2);

                printf("Hypotenuse is: %.2f\n", calcHypotenuse(side1, side2));
                break;
            }
            case circleInfo:
            {
                int radius = 0;

                printf("Enter circle radius: ");
                scanf("%d", &radius);

                printf("Perimeter: %.2f\n", calcCircleInfo(radius, 'p'));
                printf("Area: %.2f\n", calcCircleInfo(radius, 'a'));
                break;
            }
            case rectangleArea:
            {
                int length = 0, width = 0;

                printf("Enter rectangle length: ");
                scanf("%d", &length);

                printf("Enter rectangle width: ");
                scanf("%d", &width);

                printf("The area of the recrangle is %d", calcRectangleArea(length, width));
                break;
            }
            case squareArea:
            {
                int length = 0;

                printf("Enter length of square side: ");
                scanf("%d", &length);

                printf("The area of the square is %d", calcSquareArea(length));
                break;
            }
            case nothingSelected:
                printf("Goodbye!\n");
                working = 0;
                break;
        }
    }
}
/*
calculates distance between two given points
input: x1,y1 x2,y2
output: distance between this points (x1, y1 - x2, y2)
*/
float calcDistance(int x1, int x2, int y1, int y2)
{
    return sqrt(pow(x2 - x1, 2) + pow(y2 - y1, 2));
}
/*
calculates hypotenuse in triangle according the both sides
input: two sides
output: hypotenuse according the given sides
*/
float calcHypotenuse(int side1, int side2)
{
    return sqrt(pow(side1, 2) + pow(side2, 2));
}
/*
calculates circle perimeter and area according the given radius
input: radius (radius of the circle) & info (info what return: perimeter/area)
output: circle perimeter/area
*/
float calcCircleInfo(int radius, char info)
{
    if (info == 'p')
    {
        return 2 * PI * radius;

    }
    if (info == 'a')
    {
        return PI * pow(radius, 2);
    }
}
/*
calculates rectangle area according the given length & width
input: length & width
output: Rectangle area (length * width)
*/
int calcRectangleArea(int length, int width)
{
    return length * width;
}
/*
calculates square area according the given side length
input: square length
output: square area (length^2)
 */
int calcSquareArea(int length)
{
    return length * length;
}