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






void choise();
void distance();
void hypotenus();
void perimeter();
void area_recetangle();
void area_square();


int main(void)
{
    int user_choise = 1;



    while(user_choise>0 && user_choise<=6)
    {
        choise() ;
		scanf("%d", &user_choise);
        switch(user_choise)
        {
            case 1:
                distance();
                break;

            case 2:
                hypotenus();
                break;

            case 3:
                perimeter();
                break;

            case 4:
                area_recetangle();
                break;

            case 5:
                area_square();
                break;

            case 6:
                printf("goodbye");
                return (0);
                break;

            default:
				break;




        }
    }




















    return (0);
}
/*
   this function calculates the choise
*/
void choise()
{
    printf("welcome to my calculator\n enter an option:\n1 - calc distance between 2 points\n2 - calc hypotenus triangle\n3 - calc area perimeter of circle\n4 - calc area of rectangle\n5 - area of square\n6 - exit");

}

/*
     this function calculates distance
*/
void distance()
{
    int x1 = 0;
    int x2 = 0;
    int y1 = 0;
    int y2 = 0;


    printf("pls enter the first two numbers\n");
    scanf("%d%d" , &x1 , &y1);
    getchar();
    printf("pls enter the second two numbers\n");
    scanf("%d%d" , &x2 , &y2);
    getchar();

    int defferencex = x2 - x1;
    int differencey = y2 - y1;

    double result = ((sqrt(pow(defferencex,2) + pow(differencey,2))));
    printf("distance is %lf\n" , result);





}

void hypotenus()
{
    double x1 = 0;
    double x2 = 0;

    printf("pls enter the first two numbers\n");
    scanf("%lf%lf" , &x1 , &x2);
    double hypotenus = (sqrt(pow(x1,2) + pow(x2,2)));
    printf("%lf" , hypotenus);



}







void perimeter()
{
    double radius = 0;
    printf("enter a radius");
    scanf("%lf" , &radius);
    double perimeter =  radius*(2 * 3.14);
    double area = 3.14 * pow(radius,2);
    printf("%lf %lf" , perimeter , area);




}
void area_recetangle()
{
    int width = 0;
    int length = 0;
    printf("enter the length\n");
    scanf("%d" , &length);
    printf("enter the width\n");
    scanf("%d" , &width);
    int area = length * width;
    printf("the area is: %lf\n" , area);





}
void area_square()
{

    int width = 0;
    int length = 0;
    printf("enter the length\n");
    scanf("%d" , &length);
    printf("enter the width\n");
    scanf("%d" , &width);
    int area = length * width;
    printf("the area is: %lf\n" , area);





}