Contoh program bilangan prima C++

Soure code:

#include <iostream>

using namespace std;
main(){
int n,tmp;
cout<<"masukkan n = ";
cin>>n;
for(int i=1;i<=n;i++){
tmp=0;
for(int a=1;a<=i;a++){
if(i%a==0){
tmp++;
}
}
if(tmp==2){
cout<<i;
}
}
return 0;
}