Demonstrating the comma operator : Comma operator « Operators statements « C++ Tutorial

1. C++ Tutorial
2. Operators statements
3. Comma operator

#include <iostream>
#include <iomanip>
using std::cout;
using std::cin;
using std::endl;
using std::setw;

int main() {
  int count = 10;

  for(long n = 1, sum = 0, factorial = 1;sum += n, factorial *= n, n <= count ;
 n++)
    cout << setw(4) << n   << "    "
         << setw(7) << sum << " "
         << setw(15) << factorial
         << endl;
  return 0;
}

1          1               1
   2          3               2
   3          6               6
   4         10              24
   5         15             120
   6         21             720
   7         28            5040
   8         36           40320
   9         45          362880
  10         55         3628800