PRACTICE PROBLEM 3 : (11-2 to 17-2) : Automatic vending machine

FOR DETAILED EXPLANATION : VIDEO
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#include<iostream>
using namespace std;
class item
{
long id;
long cost;
long stock;
public:
void read()
{
cin>>id;
cin>>cost;
cin>>stock;
}
int check(int n)
{
if(n==id)
return 1;
else
throw(0);
}
int costcheck(int n)
{
if(n>cost)
return 1;
else
throw(0.0);
}
int stockcheck()
{
if(stock>=1)
return 1;
else
throw string("ERROR");
}
void display()
{
cout<<id;
}


};
int main()
{
int n;
cin>>n;
item I[n];
for(int i=0;i<n;i++)
{
I[i].read();
}
int it,c;
cin>>it;
cin>>c;
int c2=0;
//cout<<"\n";
for(int i=0;i<n;i++)
{
try
{
I[i].check(it);
I[i].costcheck(c);
I[i].stockcheck();
I[i].display();
}
catch(int i)
{
c2++;
}
catch(double k)
{
cout<<"Insufficient amount"<<endl;
break;
}catch(string a)
{
cout<<"Less stock"<<endl;
break;
}
}
if(c2==n)
cout<<"Wrong item code";
return 0;
}