#include <stdio.h>

typedef struct{
    double x;
    double y;
}Point;

double absolute(double val){
    if(val<0){
        return -val;
    }
    return val;
}

Point scan_point(void){
    Point p;
    printf("X座標を入力:");
    fflush(stdout);
    scanf("%lf",&p.x);
    printf("Y座標を入力:");
    scanf("%lf",&p.y);
    return p;
}

double area_of(Point p1, Point p2){
    double width=absolute(p1.x-p2.x);
    double height=absolute(p1.y-p2.y);
    return width*height;
}

double circumference_of(Point p1, Point p2){
    double width=absolute(p1.x-p2.x);
    double height=absolute(p1.y-p2.y);
    return 2.0*(width+height);
}

int main(void){
    printf("左上隅の座標を入力してください\n");
    Point p1=scan_point();

    printf("\n右下隅の座標を入力してください\n");
    Point p2=scan_point();

    double area=area_of(p1, p2);
    double circumference=circumference_of(p1, p2);

    printf("\n面積:%.2f\n",area);
    printf("周囲の長さ:%.2f\n",circumference);
    
    return 0;
}