我已經(jīng)在這幾個(gè)小時(shí),嘗試不同的方法看幾乎每個(gè)問題.也許我完全錯(cuò)了,但我覺得我的數(shù)學(xué)是正確的,但無論我輸入什么數(shù)字,我都得到相同的輸出.我的代碼在某個(gè)地方關(guān)閉,我必須在午夜之前將其打開.

這一切都很有趣：找出一個(gè)點(diǎn)是否在三角形代碼中. (對(duì)于初學(xué)者)

import java.util.Scanner;

public class PointsTriangle {

// checks if point entered is within the triangle

//given points of triangle are (0,0) (0,100) (200,0)

public static void main (String [] args) {

//obtain point (x,y) from user

System.out.print("Enter a point's x- and y-coordinates: ");

Scanner input = new Scanner(System.in);

double x = input.nextDouble();

double y = input.nextDouble();

//find area of triangle with given points

double ABC = ((0*(100-0 )+0*(0 -0)+200*(0-100))/2.0);

double PAB = ((x*(0 -100)+0*(100-y)+0 *(y- 0))/2.0);

double PBC = ((x*(100-0 )+0*(0 -y)+200*(y-100))/2.0);

double PAC = ((x*(0 -100)+0*(100-y)+200*(y- 0))/2.0);

boolean isInTriangle = PAB + PBC + PAC == ABC;

if (isInTriangle)

System.out.println("The point is in the triangle");

else

System.out.println("The point is not in the triangle");

}//end main

}//end PointsTriangle

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