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
+