Diff: main.cpp

Revision:

0:e0dea4ed78aa

Child:

2:5fd21c59f63c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Apr 21 18:31:26 2020 +0000
@@ -0,0 +1,58 @@
+/*
+
+Übung für Bulme:
+
+#141 Beharrlichkeit natürlicher Zahlen
+von der Web-Seite:
+https://trainyourprogrammer.de/index.pl?page=cplusplus&seite=12#for_scrollposition
+
+*/
+
+#include <iostream>
+#include <cmath>
+
+using std::cout;
+using std::endl;
+
+size_t multipleDigits(size_t number_to_mult)
+{
+  size_t result = 1;
+  size_t rest = 0;
+  while(number_to_mult)
+  {
+    rest = number_to_mult % 10;
+    result *= rest;
+    if (rest == 0)
+    {
+      return 0;
+    }
+    number_to_mult /= 10;
+  }
+  return result;
+}
+
+int main(int argc, char const *argv[])
+{
+  size_t MAX = pow(9, 6);
+  size_t current_persintence = 0;
+  size_t persistance_max = 0;
+  size_t persist_number_max = 0;
+  size_t current_num;
+  for (size_t i = 11; i <= MAX; i++)
+  {
+    current_persintence = 0;
+    current_num = i;
+    do
+    {
+      current_num = multipleDigits(current_num);
+      ++current_persintence;
+    } while (current_num > 9);
+    if(persistance_max < current_persintence)
+    {
+      persistance_max = current_persintence;
+      persist_number_max = i;
+    }
+  }
+ std::cout << "number with the highest persistance is " << persist_number_max << std::endl;
+  return 0;
+}