Squashed bug causing incorrect digits. Now fully working

I totally brainfarted and put this->preDigits.size() in the for
loop comparison clause, which gets re-evaluated every loop.
So it was leaving digits on the stack that should have been
printed, causing errors both immediately and down the line.

.gitignore

@@ -1,3 +1,6 @@
+*.txt
+main
+.gdb_history
 # Created by https://www.toptal.com/developers/gitignore/api/c++
 # Edit at https://www.toptal.com/developers/gitignore?templates=c++
 
@@ -37,3 +40,26 @@
 
 # End of https://www.toptal.com/developers/gitignore/api/c++
 
+# Created by https://www.toptal.com/developers/gitignore/api/codeblocks
+# Edit at https://www.toptal.com/developers/gitignore?templates=codeblocks
+
+### CodeBlocks ###
+# specific to CodeBlocks IDE
+*.layout
+*.depend
+*.cbp 
+# generated directories
+bin/
+obj/
+
+# End of https://www.toptal.com/developers/gitignore/api/codeblocks
+
+# Created by https://www.toptal.com/developers/gitignore/api/kdevelop4
+# Edit at https://www.toptal.com/developers/gitignore?templates=kdevelop4
+
+### KDevelop4 ###
+*.kdev4
+.kdev4/
+
+# End of https://www.toptal.com/developers/gitignore/api/kdevelop4
+

Makefile

@@ -1,7 +1,7 @@
 CC=gcc
 CXX=g++
 RM=rm -f
-CPPFLAGS=-ggdb -Og -Wall
+CPPFLAGS=-ggdb -O0 -Wall
 LDFLAGS=-g
 LDLIBS=-lm
 

Spigot.cpp

@@ -1,4 +1,6 @@
 #include <iostream>
+#include <cmath>
+#include <cassert>
 #include "Spigot.hpp"
 
 Spigot::Spigot(int requestedNumDigits) {
@@ -11,13 +13,14 @@ Spigot::Spigot(int requestedNumDigits) {
 
 void Spigot::pump(void) {
     int tempPreDigit = 0;
-    int i = this->spigotListLength - 1;
+    int j = this->spigotListLength - 1;
+    int i = j;
     while(i >= 0) {
         this->spigotList[i] *= 10;
         i--;
     }
     this->carry = 0;
-    i = this->spigotListLength - 1;
+    i = j;
     // note this does *not* handle the i=0 case
     while(i > 0) {
         this->spigotList[i] += this->carry;
@@ -27,28 +30,36 @@ void Spigot::pump(void) {
     }
     // special case of i = 0
     this->spigotList[0] += this->carry;
-    tempPreDigit = this->spigotList[0] // 10;
+    tempPreDigit = this->spigotList[0] / 10;
     this->spigotList[0] -= (tempPreDigit * 10);
 
-    // handle the cases depending on the tempPreDigit
-    if(tempPreDigit >= 0 && tempPreDigit <= 8) {
-        // output all predigits
-        for(long unsigned int j = 0; j < this->preDigits.size(); j++) {
-            std::cout << this->preDigits.back();
-            this->preDigits.pop_back();
+    try {
+        // handle the cases depending on the tempPreDigit
+        if(tempPreDigit >= 0 && tempPreDigit <= 8) {
+            // output all predigits
+            long unsigned pdLen = this->preDigits.size();
+            for(long unsigned int j = 0; j < pdLen; j++) {
+                std::cout << this->preDigits.back() << std::flush;
+                this->preDigits.pop_back();
+            }
+            assert(this->preDigits.size() == 0);
+            this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
+
+        } else if(tempPreDigit == 9) {
+            this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
+        } else if(tempPreDigit == 10) {
+            tempPreDigit = 0;
+            long unsigned pdLen = this->preDigits.size();
+            for(long unsigned int j = 0; j < pdLen; j++) {
+                std::cout << (this->preDigits.back() + 1) % 10 << std::flush;
+                this->preDigits.pop_back();
+            }
+            this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
+        } else {
+            std::cout << "We should never have gotten here -- shit has hit the fan!" << std::endl;
         }
-        this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
-    } else if(tempPreDigit == 9) {
-        this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
-    } else if(tempPreDigit == 10) {
-        tempPreDigit = 0;
-        for(long unsigned int j = 0; j < this->preDigits.size(); j++) {
-            std::cout << (this->preDigits.back() + 1) % 10;
-            this->preDigits.pop_back();
-        }
-        this->preDigits.insert(this->preDigits.begin(), tempPreDigit);
-    } else {
-        std::cout << "We should never have gotten here -- shit has hit the fan!" << std::endl;
+    } catch (int e) {
+        std::cout << "An exception " << e << " occurred." << std::endl;
     }
     return;
 }

Spigot.hpp

@@ -11,13 +11,11 @@ public:
     void pump(void);
 
 private:
-    int numDigits;
     std::vector<int> spigotList;
     int spigotListLength;
     int carry;
     std::vector<int> preDigits;
 
-
 };
 
 #endif

main.cpp

@@ -1,9 +1,17 @@
 #include <iostream>
+#include <cstdlib>
 #include "Spigot.hpp"
 
-int main(void) {
-    Spigot *piSpigot = new Spigot(1000);
-    for(int i = 0; i < 1000; i++) {
+int main(int argc, char **argv) {
+    int numDigits = 0;
+    if(argc < 2) {
+        std::cout << "Usage: spigot <numDigits>" << std::endl;
+        return -1;
+    } else {
+        numDigits = std::atoi((const char *)argv[1]);
+    }
+    Spigot *piSpigot = new Spigot(numDigits);
+    for(int i = 0; i < numDigits; i++) {
         piSpigot->pump();
     }
     return 0;