Write a program that prints out a factorial. N factorial (written N!) is defined as
N * (N – 1) * (N – 2) * … * 1
For example, 4! is
4 * 3 * 2 * 1 = 24
Ask the user for the value of N. Use for loops and variables to print out N factorial.
(Hint: You solve factorial by multiplying the numbers from 1 all the way up to N together. You need a variable to store the result.)
Here’s a simple Python program that calculates and prints the factorial of a number ( N ):
# Ask the user for the value of N
N = int(input("Enter a positive integer: "))
# Initialize a variable to store the result
factorial = 1
# Use a for loop to calculate the factorial
for i in range(1, N + 1):
factorial *= i # Multiply the current value of factorial by i
# Print the result
print(f"The factorial of {N} is {factorial}.")
### Explanation:
1. Input: The program first asks the user to input a positive integer ( N ).
2. Initialization: A variable named `factorial` is initialized to 1, which will hold the result of the multiplication.
3. For Loop: It then uses a for loop that runs from 1 to ( N ) (inclusive). In each iteration, the current loop index ( i ) multiplies with the `factorial` variable.
4. Output: Finally, it prints the result, showing the factorial of the given number ( N ).
Feel free to run the code in an environment that supports Python, and let me know if you have any questions or need further clarification!