Question

How to find the factorial of a number using recursion in C++

Answer 1

#include <iostream>
 
int factorial_recursion(int n) {
    if (n == 0 || n == 1) {
        return 1;
    }
    else {
        return(n * factorial_recursion(n - 1));
    }
}
 
int main()
{
    std::cout << factorial_recursion(5);
}
 
 
 
/*
run:
 
120
 
*/

 

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Answer 2

#include <iostream>
 
int factorial_recursion(int n) {
    return n ? n * factorial_recursion(n - 1) : 1;
}
 
int main()
{
    std::cout << factorial_recursion(5);
}
 
 
 
/*
run:
 
120
 
*/

 

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