init

c/factorial.c

@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+long fact(long n) {
+  if (n == 0) {
+    return 1;
+  }
+  else return(n*fact(n-1));
+}
+
+int main() {
+  printf("enter a POSITIVE integer... ");
+  long input;
+  scanf("%d", &input);
+  long output = fact(input);
+  printf("output: %lld\n", output);
+
+  return 0;
+}