#include<iostream>

int d(int x,int y,int z);?

using namespace std;

int main(void)

{

? ? int a;

? ? int b;

? ? int c;

//int y;

cout<<"輸入三邊長(zhǎng)以判斷："<<endl;

cin>>a>>b>>c;

//cin>>y;

cout<<"" <<endl;?

d(a,b,c);

}

int d(int x,int y,int z)

{

if (x*x+y*y=z*z)

{

cout<<x*y/2<<endl;

}

else if (x^2+z^2=y^2)

{

cout<<x*z/2<<endl;

}

else if (y^2+z^2=x^2)

{

cout<<y*z/2<<endl;

}

else

{

cout<<"這不是直角三角形！"<<endl;?

}

}