#include?

#include?

//輸入三個點

void?inputThreePoint(double?*p)

{

\x09for(int?i=0;i<6;i+=2)

\x09{

\x09\x09printf("輸入坐標點(x,y)%d:?",i+1);

\x09\x09scanf("%lf,%lf",p+i,p+i+1);

\x09\x09fflush(stdin);

\x09}

}

//計算周長

double?getPerimeter(double?*p)

{

\x09double?side_length_a=*p;

\x09double?side_length_b=*(p+1);

\x09double??side_length_c=*(p+2);

\x09return?side_length_a+side_length_b+side_length_c;

}

//計算面積

double?getArea(double?*p)

{

\x09double?side_length_a=*p;

\x09double?side_length_b=*(p+1);

\x09double?side_length_c=*(p+2);

\x09double?halfPerimeter=(side_length_a+side_length_b+side_length_c)/2;

\x09return?sqrt(halfPerimeter*(halfPerimeter-side_length_a)*(halfPerimeter-side_length_b)*(halfPerimeter-side_length_c));

}

//根據坐標點求長度

void?getLength(double?*point,double?*angelLength)

{

\x09double?x1=*point;

\x09double?y1=*(point+1);

\x09double?x2=*(point+2);

\x09double?y2=*(point+3);

\x09double?x3=*(point+4);

\x09double?y3=*(point+5);

\x09*angelLength=sqrt(pow((x1-x2),2)+pow((y1-y2),2));

\x09*(angelLength+1)=sqrt(pow((x3-x2),2)+pow((y3-y2),2));

\x09*(angelLength+2)=sqrt(pow((x3-x1),2)+pow((y3-y1),2));

}

//判斷能否構成三角形

bool?isAngel(double?*p)

{

\x09double?side_length_a=*p;

\x09double?side_length_b=*(p+1);

\x09double?side_length_c=*(p+2);

\x09

\x09if(side_length_a+side_length_b>side_length_c

\x09&&?side_length_a+side_length_c>side_length_b

\x09&&?side_length_c+side_length_b>side_length_a)

\x09{

\x09\x09return?true;

\x09}

\x09else

\x09{

\x09\x09return?false;

\x09}

}

void?main()

{

\x09double?coordinate[6];

\x09double?sideLength[3];

\x09inputThreePoint(coordinate);

\x09getLength(coordinate,sideLength);

\x09if(isAngel(sideLength)==false)

\x09{

\x09\x09printf("輸入的坐標不能構成三角形\n");

\x09}

\x09else

\x09{

\x09\x09printf("面積：%lf\n",getArea(sideLength));

\x09\x09printf("周長：%lf\n",getPerimeter(sideLength));

\x09}

}

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