The basic exercises of the blue bridge cup test rectangular area intersection BASIC-18 JAVA

Foreword

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Exam questions basic exercises rectangular area intersection

Resource limit
Time limit: 1.0s Memory limit: 512.0MB

Problem description
　　There are two rectangles on the plane, and their sides are parallel to the X axis or Y axis of the rectangular coordinate system. For each rectangle, we give the coordinates of a pair of relative vertices, please program to calculate the area of ​​the intersection of the two rectangles.

Input format The
　　input contains only two lines, each line describing a rectangle.
　　In each row, the coordinates of a pair of relative vertices of the rectangle are given. The coordinates of each point are represented by two real numbers whose absolute value does not exceed 10 ^ 7.

Output format The
　　output contains only one real number, which is the area of ​​the intersection, and is reserved to two decimal places.

Sample input
1 1 3 3
2 2 4 4

Sample output
1.00

Questions for this question

import java.util.Scanner;

public class IntersectRectangle {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        double x1 = sc.nextDouble(), y1 = sc.nextDouble(), x2 = sc.nextDouble(), y2 = sc.nextDouble();
        double x3 = sc.nextDouble(), y3 = sc.nextDouble(), x4 = sc.nextDouble(), y4 = sc.nextDouble();
        sc.close();
        if (x1 > x2) {
            double tmp = x1;
            x1 = x2;
            x2 = tmp;
        }
        if (y1 > y2) {
            double tmp = y1;
            y1 = y2;
            y2 = tmp;
        }
        if (x3 > x4) {
            double tmp = x3;
            x3 = x4;
            x4 = tmp;
        }
        if (y3 > y4) {
            double tmp = y3;
            y3 = y4;
            y4 = tmp;
        }
        double x = Math.max(x1, x3);
        double X = Math.min(x2, x4);
        double y = Math.max(y1, y3);
        double Y = Math.min(y2, y4);
        if (X - x < 0 || Y - y < 0) {
            System.out.printf("%.2f", 0.00);
        } else {
            System.out.printf("%.2f", (X - x) * (Y - y));
        }
    }
}