Pointer_Recursion_9.cpp

/***** ****
 * Factorial of a number
 * ********************************/
#include<iostream>
using namespace std;
int calcFactorial(int *);
int main(){
    int range;
    cout << "Enter a range: ";
    cin >> range;
    cout << "Factorial upto " << range << " are: " << "\n";
    for(int i=0; i<=range; i++){
        cout  << calcFactorial(&i) << endl;
    }
    
    return 0;
}
int calcFactorial(int *n){
    if(*n==1 || *n == 0){
        return 1;
    }
    int i = (*n)-1;
    return *n *calcFactorial(&i); // or we can also write : (*n)*factorial(&(*n)-1) directly.
}