想请会C++的大神帮我做三道C++数学题，要求写完整的编程。

//

// main.cpp

// 12

//

// Created by WeiWei on 9/27/15.

// Copyright © 2015 ZhuWei. All rights reserved.

//

#include

#include

using namespace std;

struct Vector2{

float x;

float y;

};

Vector2 p1;

Vector2 p2;

Vector2 p3;

int main()

{

float x,y;

cout<<"Enter the Position of p1\n";

cin>>x >> y;

p1.x = x;

p1.y = y;

cout<<"( "<< x <<" , " << y << ") \n";

cout<<"Enter the Position of p2\n";

cin>>x >> y;

p2.x = x;

p2.y = y;

cout<<"( "<< x <<" , " << y << ") \n";

cout<<"Enter the Position of p2\n";

cin>>x >> y;

p3.x = x;

p3.y = y;

cout<<"( "<< x <<" , " << y << ") \n";

float edge1= sqrt( (p2.x-p1.x)*(p2.x-p1.x) + (p2.y-p1.y)*(p2.y-p1.y) );

float edge2= sqrt( (p3.x-p2.x)*(p3.x-p2.x) + (p3.y-p2.y)*(p3.y-p2.y) );

float edge3= sqrt( (p1.x-p3.x)*(p1.x-p3.x) + (p1.y-p3.y)*(p1.y-p3.y) );

float p= (edge1 + edge2 + edge3)/2;

float s = sqrt(p*(p-edge1)*(p-edge2)*(p-edge3));

if(s==0)

{

float max = 0.0;

if(edge1 >=edge2 && edge1 >=edge3)

max = edge1;

if(edge2 >=edge1 && edge2 >=edge3)

max = edge2;

if(edge3 >=edge2 && edge3 >=edge1)

max = edge3;

cout<< " the three points are aligned in a straight line" <<"the length of the line is : "<< max <
}

else

cout<< "the S is : " << s <
return 0;

}

这是第一题的答案。 第二题 有点麻烦， 似乎要算三角形的外接圆 然后求出外接圆 圆心。 我高中毕业好多年了， 这些鸟东西都忘了 😄。 我现在只是个游戏程序员 用不了这些鬼东西。 俺不会