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c++ program to find factorial of a number

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#include <iostream>
using namespace std;

int main()
{
 unsigned int n;
 unsigned long long factorial = 1;
 cout << "Enter a positive integer: ";
 cin >> n;
 for(int i = 1; i <=n; ++i)
 {
  factorial *= i;
 }
 cout << "Factorial of " << n << " = " << factorial;    
 return 0;
}

Output

Enter a positive integer: 4
Factorial of 4 = 24
 

Explanation

• Here variable factorial is of type unsigned long long
• It is because factorial of a number is always positive, that 's why unsigned qualifier is added to it.
• Since the factorial a number can be large, it is defined as long long

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