nCr in Java

.gitignore

@@ -2,3 +2,4 @@
 venv
 private
 __pycache__
+*.out

.vscode/settings.json

@@ -0,0 +1,3 @@
+{
+    "java.project.sourcePaths": ["java"]
+}

c/calculators/helpers/factorial.c

@@ -0,0 +1,9 @@
+int factorial(int n) {
+	int ans = 1;
+
+	for (int i = 2; i <= n; i++) {
+		ans *= i;
+	}
+
+	return ans;
+}

c/calculators/ncr.c

@@ -1,14 +1,5 @@
 #include <stdio.h>
-
-int factorial(int n) {
-	int ans = 1;
-
-	for (int i = 2; i <= n; i++) {
-		ans *= i;
-	}
-
-	return ans;
-}
+#include "helpers/factorial.c"
 
 int nCr(int n, int r) {
 	return factorial(n) / factorial(r) * factorial(n - r);

java/calculators/ncr.java

@@ -0,0 +1,35 @@
+package calculators;
+import java.util.Scanner;
+
+class CombinationCalculator {
+	private static int factorial(int n) {
+		int res = 1;
+
+		for (int i = 2; i <= n; i++) {
+			res *= i;
+		}
+
+		return res;
+	}
+
+	private static int nCr(int n, int r) {
+		return factorial(n) / (factorial(r) * factorial(n - r));
+	}
+
+	public static void main(String[] args) {
+		// Open a scanner and take the relevant inputs
+		Scanner scan = new Scanner(System.in);
+
+		System.out.print("Please input the value for n: ");
+		int n = scan.nextInt();
+
+		System.out.print("Please input the value for r: ");
+		int r = scan.nextInt();
+
+		// Close the scanner, and calculate the result
+		scan.close();
+
+		int result = nCr(n, r);
+		System.out.println(result);
+	}
+}

readme.md

@@ -7,8 +7,9 @@
 
 ### Table of contents
 
--   [Python](python)
--   [C](c)
+-   [Python](languages/python)
+-   [C](languages/c)
+-   [Java](languages/java)
 -   [Project Euler](euler)
 -   [GCSE Computer Science](school/gcse)
 -   [Royal Institute Computer Science Masterclass 2021](school/royal%20institute)