Exception Handling Restricting Exception in cpp

#include<bits/stdc++.h>

using namespace std;

void fan(int a) throw(int)//only throw integer

{

   if(a==1) throw 1;

    throw 4.5;

}

int main()

{

  try

  {

      fan(1);

  }

  catch(...)

  {

      cout<<"Error\n";

  }

    return 0;

}