How to write a factorial function in C++.
#include <iostream> using namespace std; int fact (int i) { int result = 1; while (i > 0) { result = result * i; i = i-1; } return(result); } int main () { int n; cout << "Enter a natural number: "; cin >> n; while (n < 0) { cout << "Please re-enter: "; cin >> n; } cout << n << "! = " << fact(n) << endl; return(0); }
OUTPUT:
Enter a natural number: 5
5! = 120
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