i want to create a program that prompt the user to input positive number and the

Question

i want to create a program that prompt the user to input positive number and then output if it is prime number or not.
but iwant to solve it just with using include <iostream>
and i start the program like this:
#include<iostream>
using namespace std;
int main ()
{
int number,oddnumber;
cout<<"please enter a positive number"<<endl;
while (number<=0)
{
cout<<" please re-enter positiv2e number ";
cin>>number;
}
if (number==2 || number%oddnumber>0)
but i have a problem here which is how can i define the whole odd number without using cmath????

Explanation / Answer

please rate - thanks

#include <iostream>
using namespace std;
int main()
{int i,num,factors;
cout<<"Enter a number ";
cin>>num;
while (num<=0)
   {cout<<"must be>0 ";
    cin>>num;
    }
factors=0;
   for(i=2;i<=num/2;i++)
     if(num%i==0)
         factors++;
     if(factors==0)                
        cout<<num<<" is prime ";
     else
         cout<<num<<" is not prime ";            

system("pause");
}

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