Помощ по ООП /2 задачи/

[MrCreeper]

#include <iostream>
#include <cmath>

using namespace std;

char A;
long double a, b, c, R, lice, p;

int main()
{
cin>>A;

if (A=='T')
{
cin>>a>>b>>c;
p=(a+b+c)/2;
lice=sqrt(p*(p-a)*(p-b)*(p-c));
cout<<lice<<endl;
return 0;
}

if (A=='Q')
{
cin>>a>>b;
lice=a*b;
cout<<lice<<endl;
return 0;
}

if(A=='C')
{
cin>>R;
lice=3.14*pow(R, 2);
cout<<lice<<endl;
return 0;
}
}


Дано няма грешки!