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  1. A factorial of a non-negative integer n is the product of all positive integers less than or equal to n. Formula: n! = n × (n-1) × (n-2) × ... × 1. Example: 5! = 5 × 4 × 3 × 2 × 1 = 120.

    Example using Iteration:

    public class FactorialIterative {
    public static long factorial(int n) {
    long result = 1;
    for (int i = 2; i <= n; i++) {
    result *= i;
    }
    return result;
    }
    public static void main(String[] args) {
    int num = 5;
    System.out.println("Factorial of " + num + " is " + factorial(num));
    }
    }
    ใ‚ณใƒ”ใƒผใ—ใพใ—ใŸใ€‚

    Output: Factorial of 5 is 120

    Recursive Approach Recursion calls the same method until the base case is reached.

    public class FactorialRecursive {
    public static long factorial(int n) {
    if (n == 0) return 1;
    return n * factorial(n - 1);
    }
    public static void main(String[] args) {
    int num = 6;
    System.out.println("Factorial of " + num + " is " + factorial(num));
    }
    }
    ใ‚ณใƒ”ใƒผใ—ใพใ—ใŸใ€‚

    Output: Factorial of 6 is 720

    Handling Large Numbers with BigInteger For very large n, long will overflow. Use BigInteger from java.math.

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    ใ‚ใ‚ŠใŒใจใ†ใ”ใ–ใ„ใพใ—ใŸ!่ฉณ็ดฐใ‚’ใŠ่žใ‹ใ›ใใ ใ•ใ„
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