Question

How to calculate factorial of a number in C++

Answer 1

#include <iostream>

int factorial(int n) {
    int result = 1;
    while (n > 1)
        result *= n--;
    return result;
}

int main() {
    std::cout << factorial(6) << " ";
    
    return 0;
}



/*
run:

720  

*/

 

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Answer 2

#include <iostream>

int factorial(int n) {
   return (n==1 || n==0) ? 1 : n * factorial(n - 1);
}

int main() {
    std::cout << factorial(6) << " ";
    
    return 0;
}



/*
run:

720  

*/

 

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