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Answer to Question #41309 in Java | JSP | JSF for solomon

Question #41309
computes the sum of the following series.
Sum=1!+2!+3!+4!+........n!
Expert's answer
#include <iostream>
long factorial(long n) {
if ( n < 0 ) {
  return -1;
}
if ( n < 2 ) {
  return 1;
} else {
  return n * factorial(n-1);
}
}
int main() {
int fact;
long long unsigned sum = 0;
std::cout << "Please enter N " << std::endl;
std::cin >> fact;
for ( long i = 1; i <= fact; i++) {
  sum += factorial(i);
}
std::cout << "The sum is " << sum << std::endl;
return 0;
}

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