Basic Program #3

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3.Read any number and find factorial of a number. (Using Recursion)


#include <stdio.h>
long long int factorial(int n);

int main()
{
    int n;
   long long int f;
    printf("Enter an integer to find it's factorial: ");
    scanf("%d", &n);
    // show error if the user enters a negative integer
    if (n < 0)
    {
        printf("Error! Factorial of a negative number doesn't exist.\n");
    }
    else
    {  
           f=factorial(n);
            printf("Factorial of %d = %llu\n", n, f);
    }
}
long long int factorial(int n)
{
    if (n>=1)
    {
        return n*factorial(n-1);
    }
    else
    {
        return 1;
    }
}
Output
  • Enter an integer to find it's factorial: -1
    Error! Factorial of a negative number doesn't exist.
  • Enter an integer to find it's factorial: 0
    Factorial of 0 = 1
  • Enter an integer to find it's factorial: 6
    Factorial of 6 = 720

Note:

Suppose the user entered 6.

Initially, the factorial() is called from the main() function with 6 passed as an argument.

Then, 5 is passed to the factorial() function from the same function (recursive call). In each recursive call, the value of argument n is decreased by 1.

When the value of n is less than 1, there is no recursive call.

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