discussion on toph

Your code has some problems. Here's the fixed one:
#include<bits/stdc++.h>
using namespace std;
int main()
{
    int T,i;
    double area,a,b,c,s,result;
    cin>>T;
    for(i=0;i<T;i++)
    {
        cin>>a>>b>>c;
        if(a+b<c || a+c<b || b+c<a)
        {
            cout<<"Oh, No!"<<endl;
        }
        else
        {
            s=(a+b+c)/2;
            result=sqrt(s*((s-a)*(s-b)*(s-c)));
            cout<<fixed<<setprecision(2)<<result<<endl;
        }
    }
}