Write a recursive function that accepts a number as its argument and returns its factorial.

#include <stdio.h>
 
int factorial(int);
 
int main()
{
    int number;
 
    printf("Enter an integer value : ");
    scanf("%d", &number);
 
    printf("The factorial of %d is %d", number, factorial(number));
}
 
int factorial(int num)
{
    if (num == 0)
        return 1;
    else
        return num * factorial(num - 1);
} 

output:
Enter an integer value : 5
The factorial of 5 is 120