PROGRAM APLIKASI PENGHITUNGAN LUAS DI C++

Mikum , maap ye dosa salamnye gak lengkap. mau numpang apdet program ni, lagi jajal biasa AMATIRAN pemula. Harap maklum, :)
Ni program function dari c++ , perhitungan luas. Monggoooo....

#include <iostream.h>
#include <conio.h>
#include <math.h>
main()
{
int pil,p,l,L,a,t,s;
char yt;
atas:
clrscr();
cout<<"\n      PROGRAM MENGHITUNG LUAS     \n";
cout<<"---------------------------------------\n";
cout<<" [1] PERSEGI PANJANG\n";
cout<<" [2] SEGITIGA\n";
cout<<" [3] PERSEGI\n";
cout<<" [4] Selesai\n";
cout<<"---------------------------------------\n";
cout<<""<<endl;
cout<<" Created by : ANRS"<<endl;
cout<<""<<endl;
cout<<"Pilih Nomor 1/2/3/4? ";
cin>>pil;
clrscr();
switch(pil)
{
case 1:
cout<<"-------------------------------------"<<endl;
cout<<"   PROGRAM LUAS PERSEGI PANJANG  "<<endl;
cout<<"-------------------------------------"<<endl;
cout<<""<<endl;
cout<<"\nMasukkan panjang         = ";cin>>p;
cout<<"\nMasukkan lebar           = ";cin>>l;
L=p*l;
cout<<"\nLuas Persegi Panjang     = "<<L;
break;
case 2:
cout<<"-------------------------------------"<<endl;
cout<<"   PROGRAM LUAS SEGITIGA  "<<endl;
cout<<"-------------------------------------"<<endl;
cout<<""<<endl;
cout<<"\nMasukkan Alas     = ";cin>>a;
cout<<"\nMasukkan Tinggi   = ";cin>>t;
L=a*t*0.5;
cout<<"\nLuas Segitiga     = "<<L;
break;
case 3:
cout<<"-------------------------------------"<<endl;
cout<<"    PROGRAM LUAS   "<<endl;
cout<<"-------------------------------------"<<endl;
cout<<""<<endl;
cout<<"\nMasukkan sisi    = ";cin>>s;
L=s*s;
cout<<"\nLuas Persegi     = "<<L;
break;
default:
cout<<"\nAnda tidak memilih salah satu Luas";
}
cout<<"\n\nApakah ingin kembali ke menu awal ? ";cin>>yt;
if(yt=='y'||yt=='Y')
goto atas;
else
cout<<"\nTERIMA KASIH TELAH MEMAKAI PROGRAM INI";
cout<<"\n--------------------------------------";
cout<<"\n\nCreated by    : Arif Noor RahmanSyah";
getch();
return 0;
}

Semoga bermanfaat.!!!!!!!!!!!!!!!!!