How do i fix error?? Error: expected ";" before "factorial"? it says in Line 16

I'm getting an error and do not know how to fix it. My code is as follows:

#include <iostream>
using namespace std;

int main(){
  int  factorial = 1, current = 2, n;
  cout << "enter number to calculate factorial of: ";
  cin >> n;

  while (current <= n){
    factorial = current * factorial;
    current++;
  }
  cout << n << "!= " factorial << endl;

  while (n < 0) {
    cout << "Must enter a positive number!\n";
    cout << "re-Enter 开发者_Go百科number to calculate factorial of: ";
    cin >> n;
  }
  return 0;
}

You're missing an operator:

cout << n << "!= " factorial << endl;

Should be:

cout << n << "!= " << factorial << endl;