The c++ program to find the size of data types and then tell also about the data type

Q1) suppose you are programmer but you have no user manual to see the size of different data types like int, double , float , char  and long. Write a programm that will calculate the size of this data types and display data type on screen.

#include <iostream>
using namespace std;
int main()
{
int in,size_in;
float fl,size_fl;
double db,size_db;
   long lg,size_lg;
short sh,size_sh;
cout<<"Enter int = ";
cin>>in;
size_in=sizeof (in);
cout<<"The size of int(data type) = "<<size_in<<endl<<"Data type is int. "<<endl<<endl;
cout<<"Enter float = ";
cin>>fl;
size_fl=sizeof (fl);
cout<<"The size of float(data type) = "<<size_fl<<endl<<"Data type is float. "<<endl<<endl;
cout<<"Enter double = ";
cin>>db;
size_db=sizeof (db);
cout<<"The size of double(data type) = "<<db<<endl<<"Data type is double."<<endl<<endl;
cout<<"Enter long = ";
cin>>lg;
size_lg=sizeof (lg);
cout<<"The size of long(data type) = "<<size_lg<<endl<<"Data type is long."<<endl<<endl;
cout<<"Enter short = ";
cin>>sh;
size_sh=sizeof (sh);
cout<<"The size of short(data type) = "<<size_sh<<endl<<"Data type is short"<<endl<<endl;
return 0;
}