who can help me with this exercise? solution + explanation.

Question

For your math class you need a program to calculate the factorial of a number.
You're given a program which takes a number as input.

Task
Complete the program to calculate the factorial of the given number and output it.

Sample input
6

Sample output
720

Explanation
The factorial of a number is equal to the product of all  numbers less than or equal to the given number.
The factorial of 6 will be  6*5*4*3*2*1 = 720.

Hint
Use while loop to calculate the factorial of the number.

import java.util.Scanner;

public class Main
{
public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
            int  number = scanner.nextInt();
            int fact = 1;
            //your code goes here

    }
}

Answer 1

The key to solving this problem is understanding the use of loop, especially the while loop (mentioned in hint).

I would recommend you to search the forum for questions bearing similar topic (same coding problem). You may find inspirations from looking at others' suggestions.

Answer 2

Daniel-Razvan Dumitrascu
You have a variable called fact, already given with a value of 1.

Set up your while loop as per the suggestion of Ipang

May I suggest
while number > 0 as your defining statement.

You will need to adjust the fact variable by using the *= operator

You will also need to decrement the loop by 1 each iteration.

Hopefully, you now have enough hints to write your code.

Review the sections I have mentioned in your tutorial

Answer 3

Loop i=6
sum=sum*i
i--

Answer 4

For loop, the loop occurs if the int n=1 is not equal or <= to given number, ++n to change value of n, the loop occurs and inside the loop fact=fact*n, to reverse the loop for much proper then change the logic.

Answer 5

I want to mention that I can't figure out how to make them multiply automatically.