C

DeitelC/Chapter6/facto.c

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+#include <stdio.h>
+#define SIZE 6
+int whatIsThis(const int b[], size_t p);
+// function prototype
+// function main begins program execution
+int main(void)
+{
+int x; // holds return value of function whatIsThis
+// initialize array a
+int a[SIZE] = {1, 2, 3, 4, 5, 6};
+x = whatIsThis(a, SIZE);
+printf("Result is %d\n", x);
+}
+// what does this function do?
+int whatIsThis(const int b[], size_t p)
+{
+// base case
+if (1 == p)
+{
+return b[0];
+}
+else { // recursion step
+return b[p - 1] * whatIsThis(b, p - 1);
+}
+}