C/C++ Program to find prime number between 1 and n

//Program to find prime number between 1 and n
#include<iostream>
using namespace std;
int main()
{
 int n,m,i=2,is_prime=1;
 cout<<"enter up to which number you want to find prime numbers:";
 cin>>m;
 for(n=2;n<=m;n++)
        {
      for(i=2;i<n;i++)
        {
             if(n%i==0)   
                   {
                   is_prime=0;
               break;
                    }
            else
             is_prime=1;
        }
        if(is_prime)
            cout<<n<<" ";
    }
    cout<<endl;
return 0;
}
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