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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