3rd semester files

3rd-Semester-Fall-2022/PDS/Homework04/src/HW04_Aidan_Sharpe.cpp

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+/****************************************************************
+* Name: Aidan Sharpe
+* Course: Principles of Data Structures
+* Class: CS04225
+* Assignment Date: October 17, 2022
+* File Name: HW04_Aidan_Sharpe.cpp
+*****************************************************************
+* ID: Homework 4 Problem 1
+* Purpose: Read values to a linked list and rewrite them in reversed order
+*****************************************************************/
+
+#include <iostream>
+#include <string>
+#include <fstream>
+
+struct LL_Node
+{
+    int val;
+    LL_Node *next;
+
+    LL_Node(int d, LL_Node *p=nullptr)
+    {
+        val = d;
+        next = p;
+    }
+};
+
+/// @brief Adds a new node to the end of a linked list starting at memory address head
+/// @param head address of first node
+/// @param val value to add
+void AddNodeEnd(LL_Node *&head, int val);
+
+/// @brief Adds a new node to the begining of a linked list starting at memory address head
+/// @param head address of first node
+/// @param val value to add
+void AddNodeBegin(LL_Node *&head, int val);
+
+/// @brief prints a linked list in format [m0, m1, ... , mn]
+/// @param head address of first node
+void PrintLL(LL_Node *head);
+
+/// @brief write a linked list to a space-separated text file
+/// @param head address of first list node
+/// @param fname file path relative to source directory
+void WriteLLToFile(LL_Node *head, std::string fname);
+
+/// @brief read LL from space/newline separated file
+/// @param head address of first list node
+/// @param fname file path relative to source directory
+/// @param reversed whether or not to reverse the order of numbers
+void ReadLLFromFile(LL_Node *&head, std::string fname, bool reversed=false);
+
+int main()
+{
+    LL_Node *head = nullptr;
+    std::string in, out;
+    std::cout << "Input data file name (path relative to makefile directory):\n";
+    std::cin >> in;
+    ReadLLFromFile(head, in, true);
+    std::cout << "Output data file name (path relative to makefile directory):\n";
+    std::cin >> out;
+    WriteLLToFile(head, out);
+    return 0;
+}
+
+void AddNodeEnd(LL_Node *&head, int val)
+{
+    if (head == nullptr)
+        head = new LL_Node(val);
+    else
+    {
+        LL_Node* p = head;
+        while (p->next != nullptr)
+            p = p->next;
+        p->next = new LL_Node(val);
+    }
+}
+
+void AddNodeBegin(LL_Node *&head, int val)
+{
+    LL_Node *p = new LL_Node(val);
+    p->next = head;
+    head = p;
+}
+
+void PrintLL(LL_Node *head)
+{
+    LL_Node *p = head;
+    std::cout << "[";
+    while (p != nullptr)
+    {
+        std::cout << p->val;
+        p = p->next;
+        std::cout << ((p != nullptr) ? ", " : "]\n"); // separate elements by ',' and add close bracket if it's the last node
+    }
+}
+
+void WriteLLToFile(LL_Node *head, std::string fname)
+{
+    std::ofstream outfile;
+    outfile.open(fname);
+    LL_Node* p = head;
+    while(p != nullptr)
+    {
+        outfile << p->val << ' ';
+        p = p->next;
+    }
+    outfile.close();
+}
+
+void ReadLLFromFile(LL_Node *&head, std::string fname, bool reversed)
+{
+    std::ifstream infile;
+    std::string line;
+    infile.open(fname);
+    while (std::getline(infile, line))
+    {
+        std::string snum;
+        for (char c : line)
+        {
+            if (isdigit(c))
+                snum.push_back(c);
+            else if (c == ' ' || c == '\n')
+            {
+                if (reversed)
+                    AddNodeBegin(head, std::stoi(snum));
+                else
+                    AddNodeEnd(head, std::stoi(snum));
+                snum = "";
+            } 
+        }
+    }
+    infile.close();
+}