diff --git a/src/c/funktionen.c b/src/c/funktionen.c
index 8c8f0d2..bffcaeb 100644
--- a/src/c/funktionen.c
+++ b/src/c/funktionen.c
@@ -57,3 +57,17 @@ return 0;
 float power(float x, float y) {
 return pow(x, y);
 }
+
+// Function to calculate the factorial of a number
+int factorial(int x) {
+if (x >= 0) {
+int result = 1;
+for (int i = 1; i <= x; i++) {
+result *= i;
+}
+return result;
+} else {
+printf("Error: Invalid input for factorial!\n");
+return 0;
+}
+}