huh?

1 files changed, 30 insertions, 0 deletions

diff --git a/challenge-072/walt-mankowski/cpp/ch-1.cpp b/challenge-072/walt-mankowski/cpp/ch-1.cpp
new file mode 100644
index 0000000000..ba8c614fa1
--- /dev/null
+++ b/challenge-072/walt-mankowski/cpp/ch-1.cpp
@@ -0,0 +1,30 @@
+#include <stdlib.h>
+#include <iostream>
+#include <string>
+
+using namespace std;
+
+const unsigned long long fact(const int n) {
+    unsigned long long res = 1;
+    for (int i = 2; i <= n; i++)
+        res *= i;
+    return res;
+}
+
+const int num_trailing_zeros(const unsigned long long n) {
+    int cnt = 0;
+    unsigned long long pwr = 10;
+    while (n % pwr == 0) {
+        cnt++;
+        pwr *= 10;
+    }
+    return cnt;
+}
+
+int main(int argc, char *argv[]) {
+    int n = atoi(argv[1]);
+    unsigned long long f = fact(n);
+    int z = num_trailing_zeros(f);
+    string zeros = (z == 1) ? "zero" : "zeros";
+    cout << n << " as N! = " << f << " has " << z << " trailing " << zeros << endl;
+}