ex7

#include <iostream>
#include <cmath>
using namespace std;

int main()
{//problema 7
    cout<<"1.Triunghi"<<endl;
    cout<<"2.Dreptunghi"<<endl;
    cout<<"3.Cerc"<<endl;
    cout<<"4.Terminare"<<endl;
    unsigned short opt;
    float A,P;
    cout<<"Optiunea d-voastra:";
    cin>>opt;
    switch (opt)
    {
     case 1: float a,b,c,p;
     cout<<"a=";cin>>a;
     cout<<"b=";cin>>b;
     cout<<"c=";cin>>c;
     P=a+b+c;
     p=P/2;
     A=sqrt(p*(p-a)*(p-b)*(p-c)); break;
     case 2: float l,L;
     cout<<"l=";cin>>l;
     cout<<"L=";cin>>L;
     P=2*(l+L);
     A=l*L; break;
     case 3: float r;
     P=2*r*M_PI;
     A=r*r*M_PI; break;
     case 4: return 0;
     default : cout<<"OPTIUNE INEXISTENTA!!!";
    }
     cout<<"P="<<P<<endl;
     cout<<"A="<<A<<endl;
return 0;
}