homework2-3

// Example program
#include <iostream>
#include <math.h>
using namespace std;

int main()
{
  double a;
  double b;
  double c;
  double p;
  double s;

  cout << "a=";
  cin >> a;
  cout << "b=";
  cin >> b;
  cout << "c=";
  cin >> c;


  if (a+b<c){
      cout << "net takogo treugolnika" << endl;
      }

  if (a+c<b){
      cout << "net takogo treugolnika" << endl;
      }

    if (c+b<a){
      cout << "net takogo treugolnika" << endl;
      }

  p=(a+b+c)/2;
  cout << "p=";
  cout << p << endl;
  s=p*(p-a)*(p-b)*(p-c);
  s=sqrt(s);
  cout << "s=";
  cout << s << endl;

}