From 200eb1c46d53a84e7aa222225a64048f1eced711 Mon Sep 17 00:00:00 2001
From: William Culhane <will@culhane.top>
Date: Fri, 4 Jun 2021 12:33:44 -0600
Subject: [PATCH] lab5: Finish assignment

---
 labs/lab5/lab5.cpp | 212 +++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 205 insertions(+), 7 deletions(-)

diff --git a/labs/lab5/lab5.cpp b/labs/lab5/lab5.cpp
index d1d678f..9261ddc 100644
--- a/labs/lab5/lab5.cpp
+++ b/labs/lab5/lab5.cpp
@@ -9,24 +9,222 @@ using namespace std;
  * Fri Jun  4 10:46:06 AM MDT 2021
  */
 
+// These are a collection of helper functions that generate strings
+// for each location in the number
+
+void handle_thousand(vector<string> *out_vec, char digit) {
+  switch (digit) {
+  case '1': {
+    out_vec->push_back("one thousand");
+    break;
+  }
+  case '2': {
+    out_vec->push_back("two thousand");
+    break;
+  }
+  case '3': {
+    out_vec->push_back("three thousand");
+    break;
+  }
+  case '4': {
+    out_vec->push_back("four thousand");
+    break;
+  }
+  case '5': {
+    out_vec->push_back("five thousand");
+    break;
+  }
+  case '6': {
+    out_vec->push_back("six thousand");
+    break;
+  }
+  case '7': {
+    out_vec->push_back("seven thousand");
+    break;
+  }
+  case '8': {
+    out_vec->push_back("eight thousand");
+    break;
+  }
+  case '9': {
+    out_vec->push_back("nine thousand");
+    break;
+  }
+  }
+}
+
+void handle_hundred(vector<string> *out_vec, char digit) {
+  switch (digit) {
+  case '1': {
+    out_vec->push_back("one hundred");
+    break;
+  }
+  case '2': {
+    out_vec->push_back("two hundred");
+    break;
+  }
+  case '3': {
+    out_vec->push_back("three hundred");
+    break;
+  }
+  case '4': {
+    out_vec->push_back("four hundred");
+    break;
+  }
+  case '5': {
+    out_vec->push_back("five hundred");
+    break;
+  }
+  case '6': {
+    out_vec->push_back("six hundred");
+    break;
+  }
+  case '7': {
+    out_vec->push_back("seven hundred");
+    break;
+  }
+  case '8': {
+    out_vec->push_back("eight hundred");
+    break;
+  }
+  case '9': {
+    out_vec->push_back("nine hundred");
+    break;
+  }
+  }
+}
+
+void handle_ten(vector<string> *out_vec, char digit) {
+  switch (digit) {
+  case '2': {
+    out_vec->push_back("twenty");
+    break;
+  }
+  case '3': {
+    out_vec->push_back("thirty");
+    break;
+  }
+  case '4': {
+    out_vec->push_back("fourty");
+    break;
+  }
+  case '5': {
+    out_vec->push_back("fifty");
+    break;
+  }
+  case '6': {
+    out_vec->push_back("sixty");
+    break;
+  }
+  case '7': {
+    out_vec->push_back("seventy");
+    break;
+  }
+  case '8': {
+    out_vec->push_back("eighty");
+    break;
+  }
+  case '9': {
+    out_vec->push_back("ninety");
+    break;
+  }
+  }
+}
+
+void handle_single(vector<string> *out_vec, char digit) {
+  switch (digit) {
+  case '1': {
+    out_vec->push_back("one");
+    break;
+  }
+  case '2': {
+    out_vec->push_back("two");
+    break;
+  }
+  case '3': {
+    out_vec->push_back("three");
+    break;
+  }
+  case '4': {
+    out_vec->push_back("four");
+    break;
+  }
+  case '5': {
+    out_vec->push_back("five");
+    break;
+  }
+  case '6': {
+    out_vec->push_back("six");
+    break;
+  }
+  case '7': {
+    out_vec->push_back("seven");
+    break;
+  }
+  case '8': {
+    out_vec->push_back("eight");
+    break;
+  }
+  case '9': {
+    out_vec->push_back("nine");
+    break;
+  }
+  }
+}
+
 int main(int argc, char **argv) {
+  // Check for appropriate number of arguments
   if (argc != 2) {
     cerr << "Invalid number of argument\n";
     return 1;
   }
 
-  char* raw_num = argv[1];
-
-  unsigned int raw_num_length;
+  char *raw_num = argv[1];
+  unsigned int raw_num_length = 0; // Digits in the number
 
-  for (unsigned int i = 0; i < 4; i++) {
-    if (raw_num[i] == 0) {
-      raw_num_length = i + 1;
+  // Find the number of digits in the input number
+  for (unsigned int i = 0; i < 5; i++) {
+    if (raw_num[i] == '\0') {
+      raw_num_length = i;
       break;
+    } else if (raw_num[i] == '0') {
+      // Handle if a 0 is found
+      cerr << "Oops! Entered a 0 in the number\n";
+      return 2;
+    }
+  }
+
+  vector<string> out_vec;
+
+  // Create the output vector, going from the MSD to the LSD
+  switch (raw_num_length) {
+  case 4:
+    handle_thousand(&out_vec, raw_num[raw_num_length - 4]);
+  case 3:
+    handle_hundred(&out_vec, raw_num[raw_num_length - 3]);
+  case 2:
+    if (raw_num[raw_num_length - 2] == '1') {
+      // Handle if the 10^1 digit is a 1
+      cerr << "Oops! Entered a 1 in the tens place\n";
+      return 3;
     }
+    handle_ten(&out_vec, raw_num[raw_num_length - 2]);
+  case 1:
+    handle_single(&out_vec, raw_num[raw_num_length - 1]);
+    break;
+  default:
+    cerr << "Unexpected input length\n";
+    return 1;
+  }
+
+  // Print output and exit with success
+  cout << "Number " << raw_num << " is written as";
+
+  for (unsigned int i = 0; i < out_vec.size(); i++) {
+    cout << ' ' << out_vec[i];
   }
 
-  cout << raw_num_length;
+  cout << '\n';
 
   return 0;
 }
-- 
2.45.2