C++ program to check whether the number is prime or not

C++ program to check whether the number is prime or not

#include<iostream.h>
#include<conio.h>
class prime
{
int num,i,p;
public:
void input()
{
cout<<"Enter any number\n";
cin>>num;
}
void output()
{
if(num==1 || num==2)
cout<<"Number is prime";
else
{
for(i=2;i<num;i++)
{
if(num%i==0)
 {
cout<<"Number is not prime";
break;
 }
 else
 p++;
 if(i==num-1)
 {
 if (p!=0)
 cout<<"Number is prime";
 }
 }
 }
}
};
void main()
{
clrscr();
prime a;
a.input();
a.output();
getch();
}