How do you check if a number is a factorial of another number?

How do you check if a number is a factorial of another number?

The factorial of a number is the product of all the integers from 1 to that number. For example, the factorial of 6 is 1*2*3*4*5*6 = 720 . Factorial is not defined for negative numbers, and the factorial of zero is one, 0! = 1 .

How do you check whether a number is factorial or not in Java?

Factorial Program using loop in java

1. class FactorialExample{
2. public static void main(String args[]){
3. int i,fact=1;
4. int number=5;//It is the number to calculate factorial.
5. for(i=1;i<=number;i++){
6. fact=fact*i;
7. }
8. System.out.println(“Factorial of “+number+” is: “+fact);

How do you find whether a number is factorial or not in Python?

Example –

1. num = int(input(“Enter a number: “))
2. factorial = 1.
3. if num < 0:
4. print(” Factorial does not exist for negative numbers”)
5. elif num == 0:
6. print(“The factorial of 0 is 1”)
7. else:
8. for i in range(1,num + 1):

What is factorial programming?

C++ProgrammingServer Side Programming. Factorial of a non-negative integer n is the product of all the positive integers that are less than or equal to n. For example: The factorial of 5 is 120.

How do you find the factorial of a number in a for loop?

Program 1: Factorial program in c using for loop

1. #include
2. int main(){
3. int i,f=1,num;
4. printf(“Enter a number: “);
5. scanf(“\%d”,#);
6. for(i=1;i<=num;i++)
7. f=f*i;
8. printf(“Factorial of \%d is: \%d”,num,f);

How to find factorial of given number in C program?

// C program to find factorial of given number #include // function to find factorial of given number unsigned int factorial (unsigned int n) { if (n == 0) return 1; return n * factorial (n – 1); } int main () { int num = 5; printf (“Factorial of \%d is \%d”, num, factorial (num)); return 0; }

How do you find the factorial of 0?

The factorial of a positive number n is given by: factorial of n (n!) = 1 * 2 * 3 * 4….n The factorial of a negative number doesn’t exist. And, the factorial of 0 is 1.

Is there any more efficient way to check whether a number is factorial?

Your question states ” is there some more efficient way to check whether a number is factorial or not?” – and the answer is: the most efficient way is …drum roll… have an array of known factorials. – Mitch Wheat

Does is_factorial() function work correctly?

Both these functions, seem to work correctly. When we supply them for large inputs repeatedly, then the is_factorialwill be repeatedly calling factorialwhich will be really a waste of time. I have also tried maintaining a table for factorials