팩토리얼 계산 2가지 방법

for문사용

1. #include <cstdlib>
2. #include <iostream>
3. using namespace std;
4. int main()
5. {
6. int getNum=0;
7. int result=1;
8.  
9. cin >> getNum;
10.  
11. for(int j=1; j<=getNum; j++)
12. result *= j;
13. cout << result << endl;
14. return 0;
15. }

 

재귀적으로 호출

1. #include <cstdlib>
2. #include <iostream>
3. using namespace std;
4. int factorial(int n)
5. {
6. if(n == 1)
7. return 1;
8. else
9. return n * factorial(n-1);
10. }
11.  
12. int main()
13. {
14. int n, result;
15.  
16. cin >> n;
17. result = factorial(n);
18. cout << result << endl;
19.  
20. return 0;
21. }