Triangle related problem.

Program to accept 3 sides and check if is it of a triangle. If yes, also find type of the triangle.

#include<iostream.h>

#include<conio.h>

#include<math.h>

void main()

  {

    float a, b, c, s, tmp, base, h, max;

    cout<<"Enter 1st side : ";

    cin>>a;

    cout<<"Enter 2nd side : ";

    cin>>b;

    cout<<"Enter 3rd side : ";

    cin>>c;

    max=a;

    base=b;

    h=c;

    if(b>max)

     {

          max=b;

  base=a;

  h=c;

}

    else if(c>max)

        { 

   max=c;

   base=a;

       h=b;

      }

    s=(a+b+c)/2;

    tmp=(s-a)*(s-b)*(s-c)*s;

    if(tmp > 0)

        {

  if(a==b && b==c)

    {

      cout<<"\nThe given triangle is a equilateral triangle";

            }

          else if(pow(max,2)==pow(base,2)+pow(h,2))

            {

      if(a==b || b==c || a==c)

        {

  cout<<"\nThe given triangle is a isosceles right angled triangle";

}

      else if(a!=b  && b!=c)

{

  cout<<"\nThe given triangle is a scalene right angled triangle";

}

           }

 else if(a==b || b==c || a==c)

   {

     cout<<"\nThe given triangle is a isoceles triangle";

   }

 else if(a!=b  && b!=c)

   {

     cout<<"\nThe given triangle is a scalene triangle";

   }

      }

    else

      {

        cout<<"\nThe gives sides donot form a triangle.";

      }

    getch();

  }