// Èý½ÇÐÎ.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <math.h>
#include <iostream.h>
int main(int argc, char* argv[])
{   double s,p;
    int a,b,c;
    cin>>a>>b>>c;
    if ((a+b>c)&&(b+c>a)&&(a+c>b))
    { p=(a+b+c)/2;  s=sqrt(p*(p-a)*(p-b)*(p-c));}   
      cout<<p;
    cout<<s;
    cout<<"&Auml;&Uuml;&sup3;&Eacute;&Egrave;&yacute;&frac12;&Ccedil;&ETH;&Icirc;"<<endl;

    else cout<<"&sup2;&raquo;&Auml;&Uuml;"<<endl;
    return 0;
}

我用回答了我发错了！