Factorial Program using for Loop in C++ | Factorial using Recursion function in C++

Factorial Program using Loop

Factorial Program in C++ using loop.

1. #include <iostream>  
2. using namespace std;  
3. int main()  
4. {  
5.    int i,fact=1,number;    
6.   cout<<"Enter any Number: ";    
7.  cin>>number;    
8.   for(i=1;i<=number;i++){    
9.       fact=fact*i;    
10.   }    
11.   cout<<"Factorial of " <<number<<" is: "<<fact<<endl;  
12.   return 0;  
13. }  

Output:

Enter any Number: 5  
 Factorial of 5 is: 120   

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Factorial Program using Recursion

Factorial program in C++ using recursion.

1. #include<iostream>    
2. using namespace std;      
3. int main()    
4. {    
5. int factorial(int);    
6. int fact, value;    
7. cout<<"Enter any number: ";    
8. cin>> value;    
9. fact = factorial(value);    
10. cout<<"Factorial of a number is: "<<fact <<endl;    
11. return 0;    
12. }    
13. int factorial(int n)    
14. {    
15. if(n<0)    
16. return(-1); // if n is less than 0 it will return -1      
17. if(n==0)    
18. return(1);    
19. else    
20. {    
21. return ( n*factorial(n-1) );        
22. }    
23. }  

Output:

Enter any number: 6   
Factorial of a number is: 720