factv2

qscr/c/rec2.c

@@ -0,0 +1,46 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+/*
+ * factorials
+ *
+ * in both for loop, as well as recursive
+ * factorial: voor int i, vermenigvuldig dan elke i to je bij 1 komt (uit gaande van positive ints)
+ *
+ * dus, f(3)=3*2*1 = 6 ; f(4)=4*3*2*1=24 ; f(a)=no ; f(-2)= no ; f(2.1) = no
+ *
+ * will use 2 functions:
+ * recfac using recursion
+ * itfac using iteration
+ *
+ * should probably figure out how to test this? maybe a dumb K:V?
+ * *  */
+
+int recfact(int input){
+    int fac = 1;
+    if (input==1) {
+        return fac;
+    }
+    else {
+        fac *= input * recfact(input-1);
+    }
+}
+
+int itfact(int input){
+    int sum = 1;
+    for (int i = 1; i <= input; i++) {
+        sum *= i;
+    }
+    return sum;
+}
+
+int main(){
+
+    int input = 5;
+
+    //recfact(input);
+    //itfact(input);
+    printf("%d\n", recfact(input));
+    printf("%d\n", itfact(input));
+    return 0;
+}